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The Effects of Crossflow on the Pressures and Lift Induced by the Fountain Generated Between Two Impinging JetsWhen a jet STOVL aircraft is hovering, or in a crossflow, while close to the ground wall jets flowing radially outward from the impingement points of the jets are generated. An upflow, or fountain, is generated where the wall jets from adjacent jets meet on the ground surface. The induced lift and suckdown generated by the impingement of the fountain on the lower surface of the configuration has been the subject of previous studies. This study analyzes the limited available pressure and force data on the effect of crossflow on the fountain induced lift and suckdown. The analysis includes the effects of jet spacing, height and operating conditions. However, it is limited to twin jet configurations of circular, vertical jets operating at subcritical nozzle pressure ratios over a fixed ground surface.
Document ID
19980018639
Acquisition Source
Ames Research Center
Document Type
Contractor Report (CR)
Authors
Kuhn, Richard E. (Defense Group, Inc. San Diego, CA United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1998
Subject Category
Aerodynamics
Report/Patent Number
A-98-09726
NAS 1.26:206955
NASA/CR-1998-206955
Funding Number(s)
PROJECT: RTOP 505-68-32
CONTRACT_GRANT: NAS2-14384
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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