Accession Number : ADA181265

Title :   An Investigation of Turbulence Mechanisms in V/STOL Upwash Flow Fields.

Descriptive Note : Final rept.,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE NY RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Gilbert,Barry L

PDF Url : ADA181265

Report Date : Mar 1987

Pagination or Media Count : 72

Abstract : Results are presented of an experimental investigation of the abnormally high turbulent mixing layer growth rate characteristics found in the upwash regions of V/STOL flows in ground effect. Three dimensional experimental studies were conducted in a radial wall jet facility. Measurements included velocity components, second - third - fourth moments, and integral and microscale lengths. The upwash formed by the collision of radial wall jets contains the essential characteristics of a radial upwash while decoupling the problem caused by the impinging jets on the ground plane and the recirculation zone. Keyword: Vertical takeoff aircraft; Short takeoff aircraft; Upwash; Ground effect.

Descriptors :   *GROUND EFFECT, *JET FLOW, *TURBULENT FLOW, FLOW, FLOW FIELDS, GROUND LEVEL, IMPINGEMENT, LENGTH, MOMENTS, RECIRCULATION, SHORT TAKEOFF AIRCRAFT, TURBULENCE, VERTICAL TAKEOFF AIRCRAFT, MIXING, THREE DIMENSIONAL, MODEL TESTS, RADIAL FLOW, ENTRAINMENT, VELOCITY, FLOW VISUALIZATION, LASER APPLICATIONS

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE