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Study of VTOL in ground-effect flow field including temperature effectDetailed pressure, temperature, and velocity data were obtained for twin-fan configurations in-ground-effect and flow models to aid in predicting pressures and upwash forces on aircraft surfaces were developed. For the basic experiments, 49.5 mm-diameter jets were used, oriented normal to a simulated round plane, with pressurized, heated air providing a jet. The experimental data consisted of: (1) the effect of jet height and temperature on the ground, model, and upwash pressures, and temperatures, (2) the effect of simulated aircraft surfaces on the isolated flow field, (3) the jet-induced forces on a three-dimensional body with various strakes, (4) the effects of non-uniform coannular jets. For the uniform circular jets, temperature was varied from room temperature (24 C) to 232 C. Jet total pressure was varied between 9,300 Pascals and 31,500 Pascals. For the coannular jets, intended to represent turbofan engines, fan temperature was maintained at room temperature while core temperature was varied from room temperature to 437 C. Results are presented.
Document ID
19820017294
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hill, W. G. (Grumman Aerospace Corp. Bethpage, NY, United States)
Jenkins, R. C. (Grumman Aerospace Corp. Bethpage, NY, United States)
Kalemaris, S. G. (Grumman Aerospace Corp. Bethpage, NY, United States)
Siclari, M. J. (Grumman Aerospace Corp. Bethpage, NY, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1982
Subject Category
Aeronautics (General)
Report/Patent Number
NASA-CR-166258
NAS 1.26:166258
Accession Number
82N25170
Funding Number(s)
PROJECT: RTOP 505-43-01
CONTRACT_GRANT: NAS2-10645
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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