Accession Number:

ADB073633

Title:

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

Descriptive Note:

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Personal Author(s):

Report Date:

1982-11-01

Pagination or Media Count:

10.0

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.

Subject Categories:

  • Aircraft
  • Fluid Mechanics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE