Model Size and Humidity Effects on Selected Calibration Parameters for the 16-ft Transonic Wind Tunnel at AEDC

Abstract

Analyses of wind tunnel wall surface pressure data and model force data from tests conducted in the Propulsion Wind Tunnel (16T) with 1/9- and 1/4- scale fighter models were conducted to determine the effect of model size, location, and attitude, and tunnel flow humidity and Reynolds number on the test section calibration. The tests were conducted at Mach numbers from 0.6 to 1.4 at Reynolds numbers from 1800000/ft to 4800000/ft, depending on model structural limits and Mach number. The model influence was localized and did not affect the set conditions of the flow entering the test section. The currently used Reynolds number calibration is valid within the uncertainty of the instrumentation installed in the Tunnel 16T system. Analysis of the data indicates that the test section dewpoint should be below the free-stream static temperature to prevent humidity effects on model force data.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1981
Accession Number
ADA107728

Entities

People

  • Ernest J. Lucas

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Dynamic Pressure
  • Engineering
  • Flow
  • Free Stream
  • Instrumentation
  • Mach Number
  • Moisture Content
  • Pressure Distribution
  • Pressure Measurement
  • Reynolds Number
  • Scale Models
  • Static Pressure
  • Test Facilities
  • Transonic Wind Tunnels
  • Wind Tunnels

Readers

  • Fluid Dynamics.