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Rarefied-continuum gas dynamics transition for SUMS projectThis program is to develop an analytic method for reducing SUMS data for the determination of the undisturbed atmosphere conditions ahead of the shuttle along its descending trajectory. It is divided into an internal flow problem, an external flow problem and their matching conditions. Since the existing method of Direct Simulation Monte Carlo (DSMC) failed completely for the internal flow problem, the emphasis is on the internal flow of a highly non-equilibrium, rarefied air through a short tube of a diameter much less than the gaseous mean free path. A two fluid model analysis of this internal flow problem has been developed and studied with typical results illustrated. A computer program for such an analysis and a technical paper published in Lecture Notes in Physics No. 323 (1989) are included as Appendices 3 and 4. A proposal for in situ determination of the surface accommodation coefficients sigma sub t and sigma e is included in Appendix 5 because of their importance in quantitative data reduction. A two fluid formulation for the external flow problem is included as Appendix 6 and a review article for AIAA on Hypersonic propulsion, much dependent on ambient atmospheric density, is also included as Appendix 7.
Document ID
19890016589
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Cheng, Sin-I (Princeton Univ. NJ, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1989
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-181826
NAS 1.26:181826
Accession Number
89N25960
Funding Number(s)
PROJECT: RTOP 506-48-11-03
CONTRACT_GRANT: NAS1-17234
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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