Calibration of the AEDC-PWT Aerodynamic Wind Tunnel (4T) Using Diffuser Flap Plenum Suction

Abstract

Tests were conducted in the transonic Aerodynamic wind tunnel (4T) of the Propulsion Wind Tunnel Facility to determine the effectiveness of ejector flaps for plenum pumping. During the test, the Mach number was varied from 0.2 to 1.0, and the wall porosity was varied from 1.0 to 8.0 percent. The maximum Mach number attained when using flap plenum suction alone was slightly higher than 1.0. Choking which occurred at the flap hinge point prevented the attainment of higher Mach numbers. It was found that at each Mach number and porosity, a specific flap position will give a minimum centerline Mach number deviation, but for ease of operation, it is recommended that a flap position of 2.00 in. be set for all normal test conditions. The ejector flaps simplify the Tunnel 4T operation by reducing the number of control variables needed to set test conditions and also reduce the Tunnel 4T power requirements at some test conditions by as much as 19 percent

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1970
Accession Number
AD0867975

Entities

People

  • J. A. Gunn

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Calibration
  • Compressors
  • Data Reduction
  • Engineering
  • Export Controls
  • Geometry
  • Government (Foreign)
  • Government Procurement
  • Governments
  • Measurement
  • Pressure Measurement
  • Stagnation Pressure
  • Tennessee
  • Test Facilities
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Combustion and Flow Dynamics.
  • Fluid Dynamics.