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Chemical and Thermal Nonequilibrium Heat-Transfer Analysis for Hypervelocity, Low Reynolds Number FlowChemical and thermal nonequilibrium phenomena are studied in the stagnation region of a hypervelocity blunt body. This investigation is motivated by the need to predict the heat-transfer rate to the leading edge of aeromaneuvering orbital transfer vehicles. Flight speeds of approximately 10 km/s at altitudes of approximately 80 km are considered for body radii of 1-50 cm. The analysis is based on continuum theory and is applicable to the viscous and incipient merged layer regimes of rarefied flow. A two-species, two-temperature gas model is assumed. Comparisons are made with previous theories, experimental data, and results based on the thermodynamic equilibrium assumption. The equation accounting for vibrational nonequilibrium is presented and its effects on flow properties are discussed. Parameters requiring further investigation are identified. Preliminary results indicate that the inclusion of vibrational relaxation has little effect on the heat-transfer rate for a fully catalytic surface. However, vibrational nonequilibrium may increase the heat-transfer rate to a noncatalytic surface, depending on the degree of nonequilibrium.
Document ID
19990066626
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Brown, Kevin G.
(NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Progress in Astronautics and Aeronautics: Thermophysical Aspects of Re-Entry Flows
Publisher: American Inst. of Aeronautics and Astronautics
Volume: 103
ISBN: 0-930403-10-X
Subject Category
Aerodynamics
Report/Patent Number
AIAA Paper 85-1033
Meeting Information
Meeting: Thermophysics
Location: Williamsburg, VA
Country: United States
Start Date: June 19, 1985
End Date: June 21, 1985
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Other

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