Development of a Measurement System for Rarefied Aerodynamics and Accommodation Coefficients in Hypersonic Rarefied Wind Tunnel

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Investigation on aerodynamic characteristics of hypersonic rarefied gas flows has been essential for a variety of situations, such as the Super Low Altitude Test Satellite, earth reentries, or planetary atmospheric entries. At Japan Aerospace Exploration Agency, a 100-mm Hypersonic Rarefied Wind Tunnel(HRWT) has been developed. A 45-degree conical nozzle has been designed in this research, and rarefied hypersonic flows have been successfully generated with a Mach number greater than 10.In addition, an integration system between HRWT measurements and particle simulations has been developed, and this system enables us to improve aerodynamic prediction in hypersonic rarefied flows due to the determination of surface accommodation coefficients.