Free Jet Engine Testing: Wind Tunnel Starting

Abstract

Free jet wind tunnels are used extensively for jet engine testing and development. A facility diffuser is employed for altitude simulation. Diffuser size and performance must be matched to the exhauster pumping capacity and engine installation drag or diffuser unstarts will occur. The diffuser starting theory of Rudolf Herman was reviewed and extended to determine the allowable drag coefficient of ramjet test installations in free jet wind tunnels. Specific drag limits are calculated for the Air Force free jet test stand located at The Marquardt Corporation, Van Nuys, California.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1973
Accession Number
AD0776318

Entities

People

  • Paul J. Ortwerth

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Base Pressure
  • Boundaries
  • Boundary Layer
  • Coefficients
  • Diffusers
  • Drag
  • Dynamic Pressure
  • Flow
  • Government Procurement
  • Heat Transfer
  • Jet Engines
  • Mach Number
  • Shock Waves
  • Static Pressure
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.