Installation and Pretest Analysis of DARPA Suboff Model in the DTRC anechoic Wind Tunnel

Abstract

Detailed flow measurements around an axisymmetric body were required in the wind tunnel as a part of the SUBOFF Program. To ensure the quality of all experimental data, potential flow and boundary layer computer programs were used to determine the effects of tunnel blockage, the supporting struts, the open jet, and the procedure to align the model with the flow in the wind tunnel. The results of these pre-test analyses were then used to guide the experimental setup and tunnel reference velocity selection. Pre-test analyses indicated that the velocity distribution in the x/L=0.85 plane was quite uniform. It is recommended that this plane should be used as the tunnel reference plane to normalize all predicted and measured velocities and pressures. The majority of tunnel blockage effect is estimated by using these references. The most sensitive locations for the surface pressure measurements were at the pressure taps at x/L=0.04 and 0.78. The pressure variations at these locations were used to align the model with the flow in the wind tunnel.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1990
Accession Number
ADA221497

Entities

People

  • Chen-wen Jiang
  • David J. Fry
  • Han-lieh Liu
  • Ming S. Chang

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Boundary Layer
  • Classification
  • Computational Fluid Dynamics
  • Computer Programs
  • Computers
  • Flow
  • Fluid Dynamics
  • Layers
  • Measurement
  • Mechanical Properties
  • Potential Flow
  • Pressure Distribution
  • Pressure Gradients
  • Pressure Measurement
  • Static Pressure
  • Wind Tunnels

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  • Fluid Dynamics.