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Concptos basicos para el uso de Ansys CFX
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Introduction
Turbomachinery Flow Modeling
Rotating Machinery
Incompressible Applications Hydraulic turbines: spiral casing, distributor, runner, draft tube
Pumps: impeller, volute, seals, crossovers
Mixing tanks
Inducers
Electric motors
Compressible Applications Compressors: inlets, impellers (single and multi-stage), volutes, disk cavity,
crossovers, return channels
Turbines: inlet scroll, nozzle, blade rows, disk cavity
Use of Rotating Machinery
Power Extraction Extract energy from a moving stream and convert to useful work
Examples: hydraulic turbines, gas turbines, steam turbines, expanders
Change State Change pressure/temperature/velocity of some fluid, as required by a
system or process
Examples: pumps, compressors
Use of Rotating Machinery
Moving Fluid Convey fluid from one location to another, as part of a system or process
Examples: fans, blowers, propellers, pumps
Mixing Mix different fluid streams together
Examples: various types of rotary mixers
Power Transmission Torque converters and fluid couplings
Classification of Turbomachinery
Axial machines Flow through the machine is (in general) aligned with the axis of rotation
Examples: propellers, axial fans/compressors/turbines, swirlers
Centrifugal machines Flow through the machine is (in general) perpendicular to the axis of
rotation
Examples: liquid pumps, centrifugal fans/compressors, radial turbines
Mixed flow machines Flow through the machine is somewhere between axial and centrifugal
Example: mixed flow compressor or pump
Turbomachinery Classification Examples
Axial Compressor Centrifugal Pump Mixed Flow Pump
Stage 1 Stage 2 Stage 3 Stage 4Inlet Outlet
Turbomachinery Classification Examples
Four stage turbine
stator
rotor
BY NUMBER OF STAGES
Turbomachinery Classification Examples
interface
Single Component(blower wheel blade passage)
Multiple Component(blower wheel + casing)
BY NUMBER OF COMPONENTS
Characteristics of Rotating Machinery Flow
Stationary and rotating components
Usually complex flow with significant amount of secondary flows
Flow is usually turbulent (but sometimes laminar, sometimes both, or sometimes unknown!)
Wide range of temperatures, pressures, and velocities
Newtonian and non-Newtonian liquids
Incompressible to supersonic flows
Characteristics of Rotating Machinery Flow
Swirling flows
Simple state relations (ideal fluid, constant property liquid) to complex thermodynamics and properties (R134a, steam)
Unsteady (periodic unsteadiness, usually not random)
Single and multi-phase flows
Heat transfer (and sometimes mass transfer and chemical reaction involved)