INVESTIGATION OF FREE-STREAM FLUCTUATING PRESSURES IN THE 16-FT TUNNELS OF THE PROPULSION WIND TUNNEL FACILITY

Abstract

An investigation was conducted to evaluate free-stream pressure fluctuations in the Supersonic (16S) and Transonic (16T) circuits of the Propulsion Wind Tunnel. Pressure fluctuations were observed to be less than 0.5 percent of the dynamic pressure in Tunnel 16S with no apparent discrete- frequency energy concentrations. In Tunnel 16T, unsteady pressure levels varied within an approximate range of 1 to 2 percent of the dynamic pressure for typical test conditions. Maximum values of fluctuating pressure occurred in Tunnel 16T at Mach numbers 0.70 and 0.75, where significantly large acoustical disturbances at a discrete frequency near 570 cps were observed.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1967
Accession Number
AD0818388

Entities

People

  • C. D. Riddle

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Calibration
  • Data Processing
  • Data Reduction
  • Dynamic Pressure
  • Engineering
  • Flow
  • Free Stream
  • Frequency
  • Instrumentation
  • Mach Number
  • Measurement
  • Power Spectra
  • Static Pressure
  • Test Facilities
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flow