Actions for VTOL in ground effect flows for closely spaced jets

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VTOL in ground effect flows for closely spaced jets

Author
Jenkins, R. C.
Published
Dec 1, 1979.
Physical Description
1 electronic document
Additional Creators
Hill, W. G., Jr. and Migdal, D.
Online Version

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Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
Results of a series of in ground effect twin jet tests are presented along with flow models for closely spaced jets to help predict pressure and upwash forces on simulated aircraft surfaces. The isolated twin jet tests revealed unstable fountains over a range of spacings and jet heights, regions of below ambient pressure on the ground, and negative pressure differential in the upwash flow field. A separate computer code was developed for vertically oriented, incompressible jets. This model more accurately reflects fountain behavior without fully formed wall jets, and adequately predicts ground isobars, upwash dynamic pressure decay, and fountain lift force variation with height above ground.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19810010569.
Accession ID: 81N19095.
NASA-CR-152321.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15719936