COANDA Control of a Thick Wall-Jet in the Static Case

Abstract

The thrust from a turbofan engine top-mounted on a circulation control (CC) wing was recently found to vector downward (and in some cases more than 90 degrees downward, producing thrust reversal) when the CC Coanda jet is activated. Experimental research was undertaken to provide a basis for understanding this phenomenon, for projecting its practical limits, and for exploiting its benefits. Within the range of parameters investigated, thrust- turning performance tended to improve with increases in aspect ratio of the upstream nozzle, thickness of the wing trailing edge, and nondimensional distance of the upstream nozzle ahead of the trailing edge. Maximum thrust turning was found to correspond to a relatively constant minimum ratio of trailing edge surface pressure to ambient pressure; suggesting the hypothesis that a trailing edge shape designed to produce uniform reduced static pressure over the trailing edge would be optimum.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1982
Accession Number
ADB073633

Entities

People

  • David W Taylor
  • G. G. Hudson

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Aspect Ratio
  • Deflectors
  • Engines
  • Experimental Data
  • Flow
  • Jet Flow
  • Pressure Measurement
  • Short Takeoff Aircraft
  • Static Pressure
  • Test And Evaluation
  • Thick Walls
  • Thrust
  • Trailing Edges
  • Turbofan Engines
  • Turbojet Engines
  • Walls

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Fluid Mechanics and Fluid Dynamics.