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Nonequilibrium effects on the aerothermodynamics of transatmospheric and aerobraking vehiclesA 3D CFD algorithm is used to study the effect of thermal and chemical nonequilibrium on slender and blunt body aerothermodynamics. Both perfect gas and reacting gas air models are used to compute the flow over a generic transatmospheric vehicle and a proposed lunar transfer vehicle. The reacting air is characterized by a translational-rotational temperature and a vibrational-electron-electronic temperature and includes eight chemical species. The effects of chemical reaction, vibrational excitation, and ionization on lift-to-drag ratio and trim angle are investigated. Results for the NASA Ames All-body Configuration show a significant difference in center of gravity location for a reacting gas flight case when compared to a perfect gas wind tunnel case at the same Mach number, Reynolds number, and angle of attack. For the same center of gravity location, the wind tunnel model trims at lower angle of attack than the full-scale flight case. Nonionized and ionized results for a proposed lunar transfer vehicle compare well to computational results obtained from a previously validated reacting gas algorithm. Under the conditions investigated, effects of weak ionization on the heat transfer and aerodynamic coefficients were minimal.
Document ID
19930062578
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hassan, Basil
(North Carolina State Univ. Raleigh, United States)
Candler, Graham V.
(Minnesota Univ. Minneapolis, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 93-2837
Meeting Information
Meeting: AIAA, Thermophysics Conference
Location: Orlando, FL
Country: United States
Start Date: July 6, 1993
End Date: July 9, 1993
Sponsors: AIAA
Accession Number
93A46575
Funding Number(s)
CONTRACT_GRANT: NAGW-1331
CONTRACT_GRANT: NGT-51005
CONTRACT_GRANT: NCC1-140
Distribution Limits
Public
Copyright
Other

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