Uniform Inlet Conditions for the NPS Subsonic Cascade Wind Tunnel

Abstract

Measurements of the flow field between the turning vanes and inlet plane for the test blades in the NPS Subsonic Cascade Wind Tunnel to January 1981 are reviewed. Typical velocities in this section are of the order of 100 to 200 ft/sec and the distance is less than two feet. It is concluded that some modification is necessary to achieve one percent uniformity for the mean velocity at the test cascade inlet plane and several approaches are suggested. From a study of simple analyses for turbulent wakes and of the effects of wire gauze screens, it is predicted that the desired uniformity may be obtained by installing a single screen of high resistance coefficient; the necessary pressure drop and turning of the flow would be substantial, Placing the turning vanes at a closer pitch might be adequate, but further measurements and numerical analysis would probably be necessary for design purposes.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1981
Accession Number
ADA522353

Entities

People

  • Donald M. Mceligot

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Coefficients
  • Engineering
  • Fluid Flow
  • Geometry
  • Guide Vanes
  • Layers
  • Leading Edges
  • Measurement
  • Mechanical Engineering
  • Numerical Analysis
  • Resistance
  • Steady Flow
  • Test Facilities
  • Trailing Edges
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.
  • Mathematics or Statistics