Computational flow optimization of Wind turbine blades

COMPUTATIONAL FLOW OPTIMISATION OF A WIND

TURBINE BLADE USING MRF

•P.Sarathkumar Reddy 22208101029

Internal Guide Mr. G. RAJU Asst.Prof.

INTRODUCTION OF THE PROJECT

• This Project aims to undertake aerodynamic analysis of a

Horizontal Axis Wind Turbine

• Computational Fluid Dynamics (CFD) software is used to

compare the performance of different Wind Turbine Blade

Profile

• A steady state, incompressible flow solver for Multiple

Reference Frames (MRF)

OBJECTIVEFIRST-CUT ANALYSIS • Flow optimization in different blade sections, with different Angle of

Attack (α)

• Geometry of the standard NACA-9417 Airfoil

• MH-102 from -Illinois University

• SC 02-0714 - Airfoil Investigation Website

SECOND-CUT ANALYSIS• Flow optimization in a blade with a add-on part which gives better result

• Winglet

FINAL ANALYSIS• Flow of air over a rotating wind turbine rotor implies that the fluid flows

in an inertial frame of reference while the rotor rotates in a non inertial reference frame

BLADES WITH DIFFERENT AIRFOILS

NACA-9417

SC-02 0714

MH-102

DIMENSIONS OF THE BLADE

TOTAL VIEW OF BLADES

NACA-9417

SC-02 0714

MH-102

BLADE WITH SURFACE MESH

MESH REFINEMENT

PRISM LAYER SETTING IN T-GRID

BLADE WITH FLUID VOLUME

8-PRISM LAYERS

MESH DETAILS

BLADE INSIDE THE TUNNEL

INLET

OUTLET

BOUNDARY CONDITIONS SETTING

CONVERGED SOLUTION

STATIC PRESSURE CONTRIBUTION OVER THE BLADES

NACA 9417

MH-102

SC-02 0714

VELOCITY CONTRIBUTION OVER A BLADE

NACA 9417

VECTOR PLOT AROUND THE BLADE

LIFT AND DRAG VALUES FOR THREE BLADES WITH DIFFERENT

ANGLE OF ATTACK-α

COMPARISION GRAPHSCoefficient of Drag CD Vs alpha-α

Coefficient of lift Vs alpha-α

L/D RATIO Vs ALPHA -α

Add-on part(winglet)

• After completion of first cut analysis, we finalized NACA-9417 at 10 degree angle of attack is giving the better results

• The blade which we got the better result , in that the add-on part(winglet) will be implemented and the second cut analysis starts in that configuration

CAD MODEL OF NACA-9417 BLADE WITH WINGLET

Winglet Details

Cant angle -70degree

Height-17mm

MESHED MODEL OF NACA-9417 BLADE WITH WINGLET

MESHED WINGLET

PRISM LAYER SETTING IN T-GRID

BLADE WITH WINGLET IN THE FLUID VOLUME

MESH DETAILS

WINGLET ASSEMBLY WITH TUNNEL

INLET

OUTLET

BOUNDARY CONDITION SETTING

CONVERGED SOLUTION

STATIC-PRESSURE CONTOUR

VELOCITY VECTOR CONTOUR

COMPARISION OF LIFT WITH WINGLET

COMPARISION OF DRAG WITH WINGLET

GENERATOR ASSEMBLY

THREE BLADE ASSEMBLY

MESHED GENERATOR

THREE VIEW OF TOTAL ASSEMBLY

Front view

Top view

Side view

TOTAL ASSEMBLY WITH REAR PLATE

MRF-CAPSULE

MRF-capsule inside a volume tunnel

CONVERGED SOLUTION

Static pressure contour across total assembly

Static pressure across the blades

Static pressure across the generator

Velocity contour across the blades

Velocity vectors in the whole tunnel

VECTOR PLOT ACROSS HUB

VECTORS AROUND THE WINGLET

Dynamic pressure contour

Turbulence contour across generator

CONCLUTION

• A growing number of researchers is using CFD to study wind-turbine wake aerodynamics

• More research on the effect of stratification on power production is to be expected

• Aerodynamics turbulence is a dominating factor, affecting the blade performance and Wake behaviour so we tried to reduce this factor in this analysis

REFERENCES• H. Piggott. (2010, Scoraig Wind. Available: www.scoraigwind.com• K. Kishinami, et al., "Theoretical and Experimental Study on the Aerodynamic

Characteristic of a Horizontal Axis Wind Turbine," Elsevier, 2005.• Anderson, J.D. Computational Fluid Dynamics: The Basics with

Applications.McGraw-Hill, New York, NY, USA, 1995.• Gupta, A. Computational Fluid Dynamic Simulation of Wind Turbines. Master’s

thesis, The Pennsylvania State University, 2006.• Somers, Dan M., and Tangler, J. Design and Experimental Results for the S809• Airfoil. National Renewable Energy Laboratory (NREL) (1997).

• R. E. a. K. Sheldahl, P. C., "Aerodynamic Characteristics of Seven Airfoil Sections Through 180 Degrees Angle of Attack for Use in Aerodynamic Analysis of Vertical Axis Wind Turbines, "Sandia National Laborotories, Albuquerque, New Mexico, USA1981.