Peak axial-velocity decay with single- and multi-element nozzles.Jet peak-velocity decay data were obtained for a variety of circular and noncircular single-element and multi-element nozzles for application to externally-blown-flap STOL aircraft. These data permit a rational approach, in terms of element type and element spacing, to nozzles designed to promote mixing of the jet exhaust with the surrounding air. Rapid mixing and the resulting lower axial jet velocity decreases the noise caused by the interaction of jet impingement on the flap assembly of EBF STOL aircraft. Empirical relationships are presented that permit the prediction of peak axial-velocity decay curves for a wide spectrum of mixer-type nozzles. The data are useful also in the design of ejector-type noise suppressors and for the suppression of VTOL downwash velocities caused by vertically oriented exhaust nozzles.
Document ID
19720033261
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Von Glahn, U. H.
Groesbeck, D. E.
Huff, R. G. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 72-48
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting