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An experimental investigation of the ground vortex created by a moving jetA 1 inch circular jet moving over a fixed ground board was studied in the NASA Langley Research Center Vortex Research Center. The jet passing over the ground board at a height of three nozzle diameters creates a ground vortex which was measured by a pattern of Endevco high response pressure transducers. The results are compared to existing data to determine the effect of the ground boundary eliminated by the moving jet. The penetration of the vortex both forward of and latterly to the impact point of the jet on the ground. The resulting ground vortex penetration forward of the impact point is reduced by approximately 30 percent and the lateral penetration is reduced by 50 percent over that experienced from a stationary jet over a stationary ground board with a free stream velocity.
Document ID
19890017444
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Stewart, V. R. (Stewart (Vearl R.) Columbus, OH, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1989
Subject Category
Aerodynamics
Report/Patent Number
VS-1-88
NASA-CR-181841
NAS 1.26:181841
Accession Number
89N26815
Funding Number(s)
PROJECT: RTOP 505-61-71-02
CONTRACT_GRANT: NASA ORDER L-29341-C
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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