Predicting catalycity of Si-based coating and stagnation point heat transfer in high-enthalpy CO2 subsonic flows for the Mars entry conditions

Details Predicting catalycity of Si-based coating and stagnation point heat transfer in high-enthalpy CO2 subsonic flows for the Mars entry conditions Predicting catalycity of Si-based coating and stagnation point heat transfer in high-enthalpy CO2 subsonic flows for the Mars entry conditions

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.544...77k&link_type=abstract

In: Proceedings of the International Workshop Planetary Probe Atmospheric Entry and Descent Trajectory Analysis and Science, 6-9

Physics

Mars, Entry Probes

Scientific paper

An average catalytic efficiency γW of the Si-based material with respect to surface recombination reactions O+O+S→O2+S and CO+O+S→CO2+S is rebuilt through CFD modeling the stagnation point heat transfer for subsonic high-enthalpy carbon dioxide tests conducted by 100-kW inductively heated facility. Dependence of γW versus pressure is found in the pressure range 60-140 hPa at surface temperature 1600-1630K. The extrapolation of the test data to the Martian atmosphere entry conditions based on the concept of the local heat transfer simulation predicts the reduction of the stagnation point heat flux by a factor of 1.8 and surface temperature on 250K for the Si-based material against fully catalytic heating.

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