Calculation of the 3-D Viscous Flow at the Endwall Leading Edge Region of an Axial Annular Turbine Cascade.

Abstract

A three-dimensional viscous computer code (VANS/MD) was employed to calculate the turbulent flow field at the end wall leading edge region of a 20 inch axial annular turbine cascade. The initial boundary layer roll-up and formation of the end wall vortices were computed at the vane leading edge. The calculated flow field was found to be periodic with a frequency of approximately 1600 Hz. The calculated size of the separation region for the hub endwall vortex compared favorably with measured endwall oil traces. In an effort to determine the effects of the turbulence model on the calculated unsteadiness, a laminar calculation was made. The periodic nature of the calculated flow field persisted with the frequency essentially unchanged. Additional author assigned keywords include: Axial flow turbines, Secondary flow and Vortices.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1984
Accession Number
ADA145641

Entities

People

  • L. Walitt

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Cartesian Coordinates
  • Computational Fluid Dynamics
  • Coordinate Systems
  • Equations
  • Equations Of Motion
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Measurement
  • Static Pressure
  • Steady Flow
  • Steady State
  • Stratified Fluids
  • Three Dimensional
  • Viscous Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Mechanics and Fluid Dynamics.