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Effect of mass-addition distribution and injectant on heat transfer and transition criteria.Surface pressures, heat-transfer rates, and transition locations for a sharp cone (whose semivertex angle is 12 deg) were obtained in a hypervelocity wind tunnel at a free-stream Mach number of 12 and a free-stream Re/ft range of 3,000,000 to 6,000,000. The effects of injecting either methane, nitrogen, or Freon-22 (at rates up to 2.1% of free-stream rate) were studied for a uniform injection-distribution and for a variable injection-distribution. Gaseous injection had little effect on the surface pressure measurements. For a given mass injection distribution, the laminar region heat-transfer decreases as the injection rate increases or as the molecular weight of the injectant decreases. For a given mass-injection rate (integrated over the surface of the entire cone), the transition location and heat-transfer rates were sensitive to the injection distribution. The transition Reynolds numbers were significantly greater when the local injection rate was constant over the surface of the cone.
Document ID
19720033172
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bertin, J. J.
Mccloskey, M. H.
(Texas, University Austin, Tex., United States)
Stalmach, C. J., Jr.
(LTV Aerospace Corp. Dallas, Tex., United States)
Wright, R. L.
(NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Subject Category
Thermodynamics And Combustion
Report/Patent Number
AIAA PAPER 72-183
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting
Location: San Diego, CA
Start Date: January 17, 1972
End Date: January 19, 1972
Sponsors: Science Research Council
Accession Number
72A16838
Funding Number(s)
CONTRACT_GRANT: NAS1-9524
Distribution Limits
Public
Copyright
Other

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