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Radiative viscous-shock-layer analysis of Fire, Apollo, and PAET flight dataEquilibrium, radiating viscous-shock-layer solutions are obtained for a number of trajectory points of the Fire II, Apollo 4, and PAET experimental flight vehicles. Convective heating rates calculated by a benchmark code agree well, except at high altitudes corresponding to low densities, with two engineering correlations. Calculated radiation intensities are compared with the flight radiometer data and with inviscid flow results. Differences as great as 70 percent are observed between measured data and the viscous calculations. Viscous effects reduce the intensity toward the wall, because of boundary-layer absorption, by as much as 30 percent, compared with inviscid intensities. Preliminary chemical and thermal nonequilibrium flow calculations along a stagnation streamline for a PAET trajectory predict enhancement of radiation owing to chemical relaxation. Stagnation point solutions are also presented for future air-assisted orbital transfer vehicle geometries with nose radii ranging from 0.3 to 15 m.
Document ID
19850055525
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Balakrishnan, A.
(Eloret Institute Sunnyvale, CA, United States)
Park, C.
(NASA Ames Research Center Moffett Field, CA, United States)
Green, M. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1985
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 85-1064
Accession Number
85A37676
Distribution Limits
Public
Copyright
Other

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