Ejector Ram Drag,

Abstract

Ejectors are a means of providing thrust augmentation for STOL and VTOL flight while minimizing ground impact and inlet reingestion problems. However, for some ejector configurations, experiments have indicated that axial thrust recovery is not effective in off-setting ejector ram drag so that such systems may encounter difficulties transitioning from engine-borne to wing-borne flight. This paper presents an analytical method of predicting this drag using empirical ejector performance parameters. A comparison between the theory and ram drag measurements from NASA Wind Tunnel Tests is presented.

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1982
Accession Number
ADP000535

Entities

People

  • Bernard B. Beard
  • William H. Foley

Organizations

  • General Dynamics

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Measurement
  • Recovery
  • Thrust
  • Thrust Augmentation
  • Wind Tunnel Tests
  • Wind Tunnels
  • Workshops

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Aerospace Engineering
  • Combustion and Flow Dynamics.