An Investigation of Turbulence Mechanisms in V/STOL Upwash Flow Fields.
GRUMMAN AEROSPACE CORP BETHPAGE NY RESEARCH AND DEVELOPMENT CENTER
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Results are presented of an experimental investigation of the abnormally high turbulent mixing layer growth rate characteristics found in the upwash regions of VSTOL 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.