Mehul Mehta

Mehta et al, International Journal of Advanced Engineering Research and Studies E

IJAERS/Vol. II/ Issue II/Jan.-March.,2013/15

CFD ANALYSIS OF MIXED FLOW PUMP IMPELLER

1P.G. Student

L.D.R.P.-I.T.R College of Engineering, Dist. Gandhinagar, St. Gujarat, India

ABSTRACT To improve the efficiency of mixed flow pump, computational fluid dynamics (CFD) analysis is one of the used in the pump industry. From the CFD analysis, the velocity and pressure in the outlet of the impeller is outlet flow conditions are used to calculate the efficiency of the calculate for the existing impeller by using the empirical relations. In the first case outlet angle is increase, and second caseinlet angle is decrease obtain from the CFD analysis, it iscause to improve efficiency. Thought that the calculation results by the flow in the impeller of a mixed flow pump on the premise that the turbulent model and boundaryto the actual situations.[1] By change the outlet angle the head of the impeller is improve. Finally, from CFD analysis the calculated efficiency of the impeller with optimum vane Head created by this analysis would be higherKEY WORDS Mixed flow pump, computational Fluid Dynamics (CFD) analysis, of impeller. With using software

1.1 INTRODUCTION

A pump is a device used to move fluids mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps. A few types of pump in Radial flow pump, mixed flow pump, axial flow pump. A wide varietyof pump types have been constructed and used in many different applications in industryCFD analysis software and advanced post processing tools the complex flow inside the impeller can be analyzed. Pumps must have a mechanism which operates theand consume energy to perform mechanical work by moving the fluid. The activating mechanism is often reciprocating or rotary. Pumps may be operated in many ways, including manual operation, electricity, an engine of some type, or wind action. 1.2 Mixed Flow Pump

In this pump, addition of energy to the liquid occurs when the flow of liquid in axial as well as radial direction. In this type of pump liquid through impeller is as combination of axial and radial direction as shown in fig 1. The head is developartly by the action of centrifugal force and partly by the propelling force. These pumps mostly suitable for irrigation purpose where large quantity of water at a lower head.

Fig 1 Mixed flow pump

1.3 Types of Blades

1.3.1 Backward-curved blades, β2<90°

When β2<90°, Cotβ2 is positive and hence with increase in mass flow rate, the head decreases. The head capacity characteristic has a negative slope.1.3.2 Radial Blades β2=0

For radial vanes β2=0 and cotβ2 =0, so head does not vary with flow rate.

International Journal of Advanced Engineering Research and Studies E

15-19

Re

CFD ANALYSIS OF MIXED FLOW PUMP IMPELLER1Mehul P. Mehta, 2Prajesh M. Patel

Address for Correspondence tudent, 2Professor, Mechanical Department,

College of Engineering, Dist. Gandhinagar, St. Gujarat, India

To improve the efficiency of mixed flow pump, computational fluid dynamics (CFD) analysis is one of the the CFD analysis, the velocity and pressure in the outlet of the impeller is to calculate the efficiency of the impeller. The optimum inlet and outlet vane angles are

late for the existing impeller by using the empirical relations. In the first case outlet angle is increase, and second casethe CFD analysis, it is reduce outlet recirculation or it is increase outlet

that the calculation results by numerically simulation software Fluent can truly reflect flow in the impeller of a mixed flow pump on the premise that the turbulent model and boundary conditions are similar

By change the outlet angle the head of the impeller is improve. Finally, from CFD analysis the efficiency of the impeller with optimum vane angle can be improved by changing the inlet and outlet angle

higher. Mixed flow pump, computational Fluid Dynamics (CFD) analysis, of impeller. With using software

o move fluids liquids by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity

types of pump in Radial flow pump, flow pump, axial flow pump. A wide variety

of pump types have been constructed and used in many different applications in industry. From the CFD analysis software and advanced post processing tools the complex flow inside the impeller can be

Pumps must have a mechanism which operates them, and consume energy to perform mechanical work by moving the fluid. The activating mechanism is often reciprocating or rotary. Pumps may be operated in many ways, including manual operation, electricity,

In this pump, addition of energy to the liquid occurs when the flow of liquid in axial as well as radial direction. In this type of pump liquid through impeller is as combination of axial and radial direction as shown in fig 1. The head is developed partly by the action of centrifugal force and partly by the propelling force. These pumps mostly suitable for irrigation purpose where large quantity of water at a

When β2<90°, Cotβ2 is positive and hence with increase in mass flow rate, the head decreases. The head capacity characteristic has a negative slope.

For radial vanes β2=0 and cotβ2 =0, so head does not

1.3.3 Forward-Curved Blades, β2<90°

For forward curved blades β2<90° and cotβ2 is negative. Hence, with increase in mass flow rate head also increases, the head capacity characteristic has a positive slope. As shown from Figure 2 for forward blades impeller, the fluid leaves the impeller with relatively high speed which means that the major part of the energy gained is kinetic energy, this type of impeller requires a very good diffuser to convert this kinetic energy to pressure energy. In practice, it is difficulthis kind of diffuser; also it is usually more efficient to convert pressure energy to kinetic energy rather than converting kinetic energy to pressure energy.

Fig.2 Types of Impeller blade base on curvature of

blades

1.4 General Information on Multi stage Mixed

Flow Pumps

“The pumps are divided into two basic groups, depending on the way in which the liquid is transferred from suction side to the delivery side of the casing as positive displacement pumps and impeller or rotodynamic pumps”. The rotodynamic pump and impeller pump terms are firstly introduced by H. Addison, Based on the direction of the flow, the rotodynamic pumps are in the category of cased pumps. The moving element in rotodynamic pumps is the impeller which is the rotor mounted on the rotating shaft and increases the moment of momentum of the flowing liquid in the impeller. The turbine pumps are first used as lifting water from the small diameter water supplies and irrigation wells. However they are used in wide range of applications other then lifting water from irrigation wells such as used in circulation systems in the steel industry for cooling, water extraction from boreholes and rivers, sea water services, deep sea mining, extraction water from geothermal wells, city water district systems and etc. Moreover, the main advantage of using the

International Journal of Advanced Engineering Research and Studies E-ISSN2249–8974

Review Article

CFD ANALYSIS OF MIXED FLOW PUMP IMPELLER

To improve the efficiency of mixed flow pump, computational fluid dynamics (CFD) analysis is one of the advanced tools the CFD analysis, the velocity and pressure in the outlet of the impeller is predicted. These

The optimum inlet and outlet vane angles are late for the existing impeller by using the empirical relations. In the first case outlet angle is increase, and second case

or it is increase outlet recirculation flow numerically simulation software Fluent can truly reflect

conditions are similar By change the outlet angle the head of the impeller is improve. Finally, from CFD analysis the

changing the inlet and outlet angle. The

Mixed flow pump, computational Fluid Dynamics (CFD) analysis, of impeller. With using software

Curved Blades, β2<90°

For forward curved blades β2<90° and cotβ2 is negative. Hence, with increase in mass flow rate head also increases, the head capacity characteristic has a

forward blades impeller, fluid leaves the impeller with relatively high

speed which means that the major part of the energy gained is kinetic energy, this type of impeller requires a very good diffuser to convert this kinetic energy to pressure energy. In practice, it is difficult to construct this kind of diffuser; also it is usually more efficient to convert pressure energy to kinetic energy rather than converting kinetic energy to pressure energy.

Types of Impeller blade base on curvature of

on on Multi stage Mixed

“The pumps are divided into two basic groups, depending on the way in which the liquid is transferred from suction side to the delivery side of the casing as positive displacement pumps and impeller or rotodynamic pumps”. The rotodynamic

pump terms are firstly introduced by H. Addison, Based on the direction of the flow, the rotodynamic pumps are in the category of cased pumps. The moving element in rotodynamic pumps is the impeller which is the rotor mounted on the

reases the moment of momentum of the flowing liquid in the impeller. The turbine pumps are first used as lifting water from the small diameter water supplies and irrigation wells. However they are used in wide range of applications

r from irrigation wells such as used in circulation systems in the steel industry for cooling, water extraction from boreholes and rivers, sea water services, deep sea mining, extraction water from geothermal wells, city water district systems

eover, the main advantage of using the



vertical turbine pumps is the ability to assemble the stages in series connection thus increasing the pressure rise across the pump easily. The pumps are classified by their specific speed. Non-dimensional specific speed or type number, N, of the pump is defined as.

Where, ω is in rad/s, Q is in m3/s, g is in m/s2

The mixed flow pumps by means of specific speed range are located between the radial pumps and axial flow pumps. The overlapping region between the radial and mixed flow pumps are named as Francis type. The specific speed range of the mixed flow pumps are given differently in the literature because of the overlapping regions of the mixed flow range with axial flow pumps and radial pumps. The range for the mixed flow pumps by means of specific speed is given in References. The mixed flow pumps discharges relatively low heads however the usage of mixed flow pumps as vertical turbine type assembly allows series connection. Thus the head of the pump assembly may be increased by series connection of the stages for the desired flow rate. The pump efficiency concerns are playing a major role in the usage of mixed flow type vertical turbine pumps. The Francis type and mixed flow type pumps have better efficiency characteristics among the other types.The development of the mixed flow type turbine type pumps are highly related to the demands of the market. The different application types developed during the years. However the concerns about energy consumption are the most important factor in the development of all type of pumps. The improvements in manufacturing techniques such as casting, surface finish on the impellers, rapid prototyping and precise measuring devices lead the industry to produce pumps with better efficiencies. 1.4.1 Vertical type Mixed flow Pump and Working

Principle

The vertical turbine type mixed flow pumps are mainly composed of four subassemblies. These subassemblies are the driver, discharge head, column assembly and the pump assembly. The pump assembly is also composed of several parts which are shown in Figure. The power is transmitted from the electric motor or any other type of driver such as diesel engine to the pump.

Fig 3: - Parts of the mixed flow Pump Assembly


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vertical turbine pumps is the ability to assemble the stages in series connection thus increasing the

The pumps are classified by their specific speed. eed or type number, N,

2 and H is m. The mixed flow pumps by means of specific speed range are located between the radial pumps and axial

overlapping region between the radial and mixed flow pumps are named as Francis type. The specific speed range of the mixed flow pumps are given differently in the literature because of the overlapping regions of the mixed flow range

and radial pumps. The range for the mixed flow pumps by means of specific speed is given in References. The mixed flow pumps discharges relatively low heads however the usage of mixed flow pumps as vertical turbine type assembly

hus the head of the pump assembly may be increased by series connection of the stages for the desired flow rate. The pump efficiency concerns are playing a major role in the usage of mixed flow type vertical turbine pumps. The

ype pumps have better efficiency characteristics among the other types. The development of the mixed flow type turbine type pumps are highly related to the demands of the market. The different application types developed

rns about energy consumption are the most important factor in the development of all type of pumps. The improvements in manufacturing techniques such as casting, surface finish on the impellers, rapid prototyping and precise

stry to produce

Vertical type Mixed flow Pump and Working

The vertical turbine type mixed flow pumps are mainly composed of four subassemblies. These subassemblies are the driver, discharge head, column

bly and the pump assembly. The pump assembly is also composed of several parts which are shown in Figure. The power is transmitted from the electric motor or any other type of driver such as

Pump Assembly

1.4.2 Velocity diagram

Assumptions for Velocity Diagram of Pump Impeller:

• Liquid enters the impeller eye in radial direction.

• No Energy losses in impeller due to friction & eddy formation.

• Liquid enters without shock.• Uniform velocity distribution in the passage

between two adjacent vanes.

Figure: - 4 Velocity Diagram

Now,

Mass Flow Rate,

From Inlet Velocity Triangle, Inlet Blade Angle,

And

From Outlet Velocity Triangle,

And,

Outlet Blade Angle,

Head Generated by Impeller,

Overall Efficiency of Impeller,

1.4.3 Application

Submersible pumps are found in many applications. Single stage pumps are used for drainage, sewage pumping, general industrial pumping and slurry pumping. They are also popular with aquarium filters. Multiple stage submersible pumps are typically lowered down a borehole and used for water abstraction, water wells and in oil wells. Special


Assumptions for Velocity Diagram of Pump

Liquid enters the impeller eye in radial

No Energy losses in impeller due to friction

Liquid enters without shock. ution in the passage

between two adjacent vanes.

4 Velocity Diagram

Submersible pumps are found in many applications. Single stage pumps are used for drainage, sewage pumping, general industrial pumping and slurry pumping. They are also popular with aquarium

tage submersible pumps are typically lowered down a borehole and used for water abstraction, water wells and in oil wells. Special



attention to the type of ESP is required when using certain types of liquids. ESP's commonly used on board naval vessels cannot be used to dewater contaminated flooded spaces. These use a 440 volt A/C motor that operates a small centrifugal pump. It can also be used out of the water, taking suction with a 2-1/2 inch non-collapsible hose. The pumped liquid is circulated around the motor for cooling purposes. There is a possibility that the gasoline will leak into the pump causing a fire or destroying the pump, so hot water and flammable liquids should be avoided.So, the main applications of the submersible pump are,

• Domestic & Community water supply• Industries • High rise buildings • Agriculture • Dairies • Fire fighting systems • Cooling water circulating system

Fig: - 5 Types of pump

MA Xi-jin and ZHANG Hua-chuan in predicated the hydraulic performance of a three-level Circulating mixed flow pump of a nuclear power station by CFD software. Meanwhile, they conducted performance test on clear water rig. The numerically simulation results were in good coincidence with the Experimental results. [2]The Mixed flow occurs when the flow is in axial as well as radial direction. In this type of pump liquid through impeller is as combination of axial and radial direction. The head is developed partly by the action of centrifugal force and partly by the propelling force. There are three types of blade used in mixed flow pump: forward curved blade, Backward curved blade, axial curved blade. Mixed flow pumps are widely used for water transportation or as cooling water pumps in power stations. To increase the flow rate of the pump witchanging the head, the blades of the newly designed Axial pump impeller. Excellent impeller blade with similar specific speed, the blade was designed into “C” type curved section to reduce the Occurrence of vortexes at the head of the blade. Properly blade outlet structure Angle β2K to eliminate or weaken the effect of vortex, and increase the flow rate in. [3] Mixed flow pump can wfollowing application like Domestic &water supply, Industries, High rise buildings, Agriculture, Dairies, Firefighting systems, water circulating systems. Not many CFD studies or measurements concerning the complex flow in all types of centrifugal pumps have been reported 2. LITERATURE SURVEY

Kiran Patel et al, studied the CFD analysis of mixed flow pump derived that the Head predicted by CFD analysis is higher than the test result at ratedalso concluded that Power predicted by CFD analysis is higher at rated point to compare with the test result.


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attention to the type of ESP is required when using ESP's commonly used on ot be used to dewater

contaminated flooded spaces. These use a 440 volt A/C motor that operates a small centrifugal pump. It can also be used out of the water, taking suction with

collapsible hose. The pumped liquid e motor for cooling purposes.

There is a possibility that the gasoline will leak into the pump causing a fire or destroying the pump, so hot water and flammable liquids should be avoided. So, the main applications of the submersible pump

Community water supply

Cooling water circulating systems

chuan in predicated the level Circulating

mixed flow pump of a nuclear power station by CFD software. Meanwhile, they conducted performance test on clear water rig. The numerically simulation results were in good coincidence with the

The Mixed flow of the liquid in axial as well as radial

direction. In this type of pump liquid through impeller is as combination of axial and radial direction. The head is developed partly by the action of centrifugal force and partly by the propelling

three types of blade used in mixed flow pump: forward curved blade, Backward curved blade, axial curved blade. Mixed flow pumps are widely used for water transportation or as cooling

To increase the flow rate of the pump without changing the head, the blades of the newly designed Axial pump impeller. Excellent impeller blade with similar specific speed, the blade was designed into “C” type curved section to reduce the Occurrence of vortexes at the head of the blade. Properly reduce the

2K to eliminate or increase the flow

Mixed flow pump can we used in Domestic & Community

water supply, Industries, High rise buildings, Agriculture, Dairies, Firefighting systems, cooling

Not many CFD studies or measurements concerning the complex flow in all

pumps have been reported [4, 5]. LITERATURE SURVEY

CFD analysis of mixed Head predicted by CFD

analysis is higher than the test result at rated point. It Power predicted by CFD analysis

o compare with the test result.

Fig: - [6.] Head versus Capacity Curve

Power predicted by CFD analysis is 5 to 10% higher at rated point. To compare with the test result, discfriction power loss calculated using NEL method [6] the volumetric efficiency is determined. Pump efficiency considering disc friction loss and leakageloss is predicted and it was found within +5% ranges, at duty point. Efficiency predicted by CFD analysis is higher than the test result. Leakage-using. Efficiency is improved by 1% after matching stator angle and changing hub curve profile.blade loading at hub and shroud has improved.

Fig: - [7] Efficiency versus Capacity Curve

A Manivannan et al., studied the mixed flow pump derived that the mixed flow pump the best efficiency point of the pump is found to be 11 lps. The existing impeller, the head, power rating and efficiency are found out to be 19.24 m, 9.46 kW and 55% respectively.

Fig: - 8 Head developed by the existing and modified

impellers

The impeller 1, the percentage increase in the head, power rating and efficiency are 3.22%, 3.9% and 7.27% respectively.

Fig: - 9 Efficiency of the existing and modified impellers


.] Head versus Capacity Curve

Power predicted by CFD analysis is 5 to 10% higher at rated point. To compare with the test result, disc-

calculated using NEL method [6] volumetric efficiency is determined. Pump

efficiency considering disc friction loss and leakage-loss is predicted and it was found within +5% ranges,

Efficiency predicted by CFD analysis is -loss is predicted

. Efficiency is improved by 1% after matching stator angle and changing hub curve profile. Stator blade loading at hub and shroud has improved.

] Efficiency versus Capacity Curve

CFD analysis of he mixed flow pump

the best efficiency point of the pump is found to be The existing impeller, the head, power rating

and efficiency are found out to be 19.24 m, 9.46 kW

developed by the existing and modified

The impeller 1, the percentage increase in the head, power rating and efficiency are 3.22%, 3.9% and

Efficiency of the existing and modified impellers



The impeller 2, the percentage increase in the head, power rating and efficiency are 10.29%, 7.61% and 10.91% respectively. Viscous flow analysis of mixed flow pump impeller.[7] The impeller 3, the percentage increase in the head, power rating and efficiency are 13.66%, 12.16% and 18.18% respectively. Mandar TABIB et al, studied the CFD analysis of mixed flow pump derived that the computational simulation of the mixed flow pump impeller was implemented. A CFD code, the ANSYS® CFX® 12.1, was used to obtain the head and pressure, velocity streamlines. The analysis results show the head of 7.45m and the head achieved by the experimental work in industries was 8.08 m. The efficiency find by experimental result was 53.27 % and by CFD analysis 49.6 %.In the CFD analysis high values were obtained for the head, comparing to the manufacturer experimental head. Because in CFD analysis there is no influence from the diffuser, so the friction losses are smaller, affecting the pressure fields and increasing the head values. This fact represents the necessity to introduce the friction losses due to coupling between the diffuser and impeller. Result shows pressure in the impeller channels increases from the entrance to the discharge in successive ranges.

Fig: - 10 The boundary condition applied to the pump

impeller

Vasilios A. et al., studied the CFD analysis of mixed flow pump derived that the mixed flow pumpnumerical results are compared to the measurements, showing good agreement and encouraging the extension of the developed computation for performance prediction and for design optimization of such impeller geometries.numerical methodology for the calculation of the flow field in centrifugal pump impellers with 2D curvature is developed and validated against corresponding experimental data taken at a Laboratory test rig. The flow is calculated using a two dimensional approach in order to achieve a fast simulation and the agreement between the numerical results and the measurements is satisfactory.the pressure fluctuation in a vaned diffuser downstream from a centrifugal pump impeller.[8] This is quite encouraging result in order to apply the present numerical model to further flow analysis, as well as, for design optimization purposes in tpump types. Maitelli et al., studied the CFD analysis of mixed low pump derived that the mixed flow pumcalculation of the flow in a centrifugal pump impeller using Cartesian grid.[9] In this paper a computational simulation of the centrifugal pump internal flow was implemented. A CFD code, the ANSYS® CFX® 11.0, was used to


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The impeller 2, the percentage increase in the head, power rating and efficiency are 10.29%, 7.61% and

Viscous flow analysis of mixed The impeller 3, the

percentage increase in the head, power rating and ncy are 13.66%, 12.16% and 18.18%

CFD analysis of computational

simulation of the mixed flow pump impeller was

A CFD code, the ANSYS® CFX® 12.1, was used to the head and pressure, velocity streamlines.

The analysis results show the head of 7.45m and the head achieved by the experimental work in industries

The efficiency find by experimental result was 53.27 % and by CFD analysis 49.6 %.In

analysis high values were obtained for the head, comparing to the manufacturer experimental

Because in CFD analysis there is no influence from the diffuser, so the friction losses are smaller, affecting the pressure fields and increasing the head lues. This fact represents the necessity to introduce

the friction losses due to coupling between the Result shows pressure in the

impeller channels increases from the entrance to the

boundary condition applied to the pump

CFD analysis of mixed flow pump derived that the mixed flow pump. The

measurements, showing good agreement and encouraging the

methodology for performance prediction and for design optimization of such impeller geometries. A numerical methodology for the calculation of the flow field in centrifugal pump impellers with 2D

ated against corresponding experimental data taken at a Laboratory test rig. The flow is calculated using a two dimensional approach in order to achieve a fast simulation and the agreement between the numerical

is satisfactory. studied the pressure fluctuation in a vaned diffuser downstream from a centrifugal pump impeller.[8] This is quite encouraging result in order to apply the present numerical model to further flow analysis, as well as, for design optimization purposes in these

CFD analysis of mixed low pump derived that the mixed flow pump calculation of the flow in a centrifugal pump impeller

In this paper a computational simulation of the centrifugal pump internal flow was implemented. A CFD code, the ANSYS® CFX® 11.0, was used to

obtain the head performance curve and to evaluate the interface connection between the pump parts: the impeller and the diffuser. Boundary conditions were adjusted in the software to characterize the threedimensional problem. Although the simplifications were done in the model, in order to adjust the geometry to the software limitations, numerical analysis using a CFD code, ANSYS® CFX® 11.0 presents results in agreement with the references. Three-dimensional simulation of the entranceimpeller interaction of a hydraulic disc pump.[10] The results obtained for the pressure fields, and therefore to the head performancesatisfactory in the three conditions tested.

Fig: - 10 Results obtained in the simulations and

manufacturer head curve.

Jidong et al., studied the Optimum design on impeller blade of mixed-flow pump based on CFD analysis. Under filing of impeller blades at the trailing edge improved the performance of the pump that is designed in this study, as stated in References. Best efficiency point of the pump that is designed in this study moves from 53 l/s to 56 l/s and system efficiency increases 2% for the best efficiency pointThe disturbance on the trailing edge of the blade caused by offsetting the designed surface in order to give thickness the blade is reduced, when is performed in the impeller blades,the comparison of the CFD results; the convergence of the analyses should be obtained. If the instable analyses are faced by means of convergence, the number of elements should be increased and the analyses should be rerun for the stability.integration of the CFD software to the design process is a continuous procedure. The code should be verified in each case study by comparing the CFD results with actual test results. The specific methods were to increase the blade inlet structure angle the blade the affect of vortex, and increase the flow rate in. [11] the test results are compared with the CFD results and hydraulic design of the pump.Selecting the suitable blade and vane thicknesses, blade swirl and vane swept angles are important from the manufacturing point of view. Michal Varcholaa et al, studied the Design of a Mixed Flow Pump Using Experimental Results of on Internal Impeller Flowvelocity and pressure flow field in the impeller of the mixed flow pump.[12] A subject of this paper is a numerical solution of a mixed - flow pump geometry with respect to a distribution of a static ressure in the channel of the pump. The distributions of pressure and velocity fields were obtained through experiments. The blade's design was obtained according to the pressure distribution in the impellers’ channel. The hydraulic projection of an impeller is very sensitive in terms of the overall efficiency as well as the position of the best efficiency point. Or said in a different


obtain the head performance curve and to evaluate the interface connection between the pump parts: the

d the diffuser. Boundary conditions were adjusted in the software to characterize the three-dimensional problem. Although the simplifications were done in the model, in order to adjust the geometry to the software limitations, numerical

D code, ANSYS® CFX® 11.0 presents results in agreement with the references.

dimensional simulation of the entrance-impeller interaction of a hydraulic disc pump.[10] The results obtained for the pressure fields, and therefore to the head performance curve, were satisfactory in the three conditions tested.

10 Results obtained in the simulations and

manufacturer head curve.

Optimum design on flow pump based on CFD of impeller blades at the

trailing edge improved the performance of the pump that is designed in this study, as stated in References. Best efficiency point of the pump that is designed in this study moves from 53 l/s to 56 l/s and system

% for the best efficiency point. The disturbance on the trailing edge of the blade caused by offsetting the designed surface in order to give thickness the blade is reduced, when under filing is performed in the impeller blades, While making

arison of the CFD results; the convergence of the analyses should be obtained. If the instable analyses are faced by means of convergence, the number of elements should be increased and the analyses should be rerun for the stability. The

CFD software to the design process is a continuous procedure. The code should be verified in each case study by comparing the CFD

The specific methods were to increase the blade inlet structure angle β1K at

affect of vortex, and increase the flow test results are compared with the

CFD results and hydraulic design of the pump. Selecting the suitable blade and vane thicknesses, blade swirl and vane swept angles are important from

d the Geometry Design of a Mixed Flow Pump Using Experimental Results of on Internal Impeller Flow research of the velocity and pressure flow field in the impeller of the

A subject of this paper is a numerical solution of a flow pump geometry with respect to a

distribution of a static ressure in the channel of the pump. The distributions of pressure and velocity fields were obtained through experiments. The

design was obtained according to the pressure distribution in the impellers’ channel. The hydraulic projection of an impeller is very sensitive in terms of the overall efficiency as well as the position of the best efficiency point. Or said in a different way, the

Mehta et al, International Journal of Advanced Engineering Research and Studies E-ISSN2249–8974

IJAERS/Vol. II/ Issue II/Jan.-March.,2013/15-19

match of optimal flow-rate and the specific energy measured and calculated. The pump designed through the described procedure, achieved its peak efficiency at the calculation point, which justifies the validity of the procedure. It can be said that the method used for projection of a blade cut based on the characteristic pressure distribution in the channel of the impeller, seems to be perspective for the prime projection of geometry of the diagonal pump. 3.1 MY COMMENTS:-

From the above review it is conclude that the following scope of work.

• CFD analysis of mixed flow impeller • impeller & blade material to be changed • number of blade increases • number of blade decreases • blade inlet angle to be changed • blade outlet angle to be changed • fluid inlet temperature of impeller center • fluid outlet temperature of diffuser • CFD software results compare with the actual

tested results and get maximum head Nomenclature C1 - axial velocity (m/s) D1 - inlet diameter (m) Q - Discharge (m3/s) U1 - circumferential velocity (m/s) β1 - inlet blade angle (Deg) ω - Angular velocity (deg/s) ACKNOWLEDGEMENT

We owe a great many thanks to a great many people who helped and supported us during this project work. We take immense pleasure in thanking Dr. Gargi Rajpara (Principal, LDRP-ITR) & PROF. A. R. Patel (Head of the Department, Mechanical Engineering, LDRP-ITR) for having permitted us to carry out this project work. We wish to express our deep sense of gratitude to my Internal Guide, Mr. Prajesh m. Patel (PROF, LDRP-ITR) for her able guidance and useful suggestions, which helped us in completing the project work, in time. REFERENCE

1. Yun Chuan-yuan. Numerical Calculation of Turbulent Flow, Performance Experiment Mixed-flow Pump Impeller. Transactions of the Chinese Society for Agricultural Machinery. V01.39, No.3 2008. 52-55

2. MA Xi-jin, ZHANG Huachuan, ZHANG Kewei. Numerical Simulation and Experiment Analysis of Thirdly Circulating Feed-water Mixed-flow Pump in Nuclear Power Station. FLUID MACHINERY. Vol.37, No.09, 2009 6-9

3. JIA Rui-xuan, XU Hong. Optimal design of low specific speed mixed-flow pumps impeller. Journal of Drainage Irrigation Machinery Engineering. Vol. No.02, 2010 98-102 [4, 5]

4. S. Cao, G. Peng, and Z. Yu, Hydrodynamic design of rot dynamic pump impeller for Multiphase pumping by combined approach of inverse design and CFD analysis, ASME Transactions, Journal of Fluids Engineering,Vol.127, 2005, pp. 330-338.

5. J. Anagnostopoulos, CFD Analysis and design effects in a radial pump impeller, WSEAS Trans. on Fluid Mechanics, Is. 7, Vol. 1, 2006,pp. 763-770.

6. T.E.Stirling : “Analysis of the design of two pumps using NEL methods” Centrifugal Pumps-Hydraulic Design-I Mech E Conference Publications 1982-11, C/183/82.

7. Miner S.M. 2001, 3-D viscous flow analysis of a mixed flow pump impeller, International Journal of Rotating Machinery, Vol. 7, No. l, pp. 53-63.

8. A. Furukawa, H. Takahara, T. Nakagawa, Y.Ono, Pressure Fluctuation in a Vaned Diffuser Downstream from a Centrifugal Pump Impeller, Intl. J. of Rotating Machinery, Vol. 9, 2003, pp. 285-292.

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