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Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v2.i1.50
pages 71-85

Thermal Protection System with Use of Porous Media for a Hypersonic Reentry Vehicle

Hirotoshi Kubota
Department of Aeronautics and Astronautics, Faculty of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113, Japan
Shunichi Uchida
Department of Aeronautics and Astronautics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

ABSTRAKT

The effectiveness of a transpiration-cooled thermal protection system for a hypersonic reentry vehicle consisting of porous material is numerically analyzed with the new concept of coupling of outer free stream and inner flow within the porous matrix. This analysis is more effective in estimation of surface temperature and heat flux to the system compared with previous methods. The transpiration of coolant fluid has great cooling effectiveness as a result of decrease of surface temperature and heat flux, as transpired fluid injected into the outer flow cools the surface as well as creates a moderate temperature gradient near the surface. Increase of back face pressure corresponding to increase of transpiration mass flow causes the lower surface temperature and smaller heat flux. The cooling effectiveness per mass transpiration rate based on decrease of surface temperature is improved by smaller porosity, which shows the superiority of smaller porosity material for practical use.


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