Survey of convective blockage for planetary entries |
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| Institution: | 1. Czech Technical University in Prague, Prague, Czech Republic;2. Research Centre Rez Ltd., Rez, Czech Republic;3. University of Ontario Institute of Technology, Oshawa, Canada;1. School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;2. Department of Electrical and Computer Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada;3. Beijing Computational Science Research Center, Beijing 100084, China;1. Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Faculty of Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran |
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| Abstract: | During a planetary entry, the decomposition of the thermal protection system material resin by the pyrolysis process produces strong blowing gases that are injected into the boundary layer. Induced by the blowing gas, the blockage phenomenon has a strong effect on the level of heat-fluxes. For some entries, such as Earth super-orbital re-entries characteristic of sample return missions, blockage is one of the key issues that have to be addressed. Additionally, this phenomenon is strongly linked to turbulence and to the porous aspects of the ablative material. Here, experimental, numerical and flight data available for different missions, involving high level of heat-fluxes, are gathered and discussed. The models for convective blockage found in the literature have been reviewed in order to select a generic way to estimate this phenomenon. It appears from this study that the convective blockage is still not fully understood and that there is no established approach for its accurate modelling since most of the existing correlations possess a high degree of empiricism. |
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