Analysis and Testing to Improve the Flow from the Plenum of a Subsonic Cascade Wind Tunnel

Abstract

The original design of the plenum and bellmouth contraction arrangement of a subsonic cascade test facility did not produce sufficiently uniform flow conditions at the bellmouth exit plane. Pneumatic measurements revealed sizeable-blade-to-blade variations in velocity and flow angle. A finite element numerical analysis of the inviscid flow field was carried out which both confirmed the need for and guided the design of a modification to the bellmouth contraction from the plenum. Following the modifications, in which the original contraction was changed to two two-dimensional contractions in series, and a program of development tests, acceptably small variations in velocity and flow angle were measured at the bellmouth exit plane.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1980
Accession Number
ADA084471

Entities

People

  • Richard C. Moebius

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Data Acquisition
  • Dynamic Pressure
  • Finite Element Analysis
  • Flow
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Measurement
  • Numerical Analysis
  • Pressure Distribution
  • Test Facilities
  • Two Dimensional
  • Wind Tunnels

Readers

  • Aerodynamics.