The Proposal of Thermal Design Method of Stand-off Thermal Protection System with Consideration for Uncertainties

摘要

Thermal Protection System (TPS) is indispensable for a reusable launch vehicle (RLV) to protect the body from aerodynamic heating during reentry into the atmosphere. In order to improve the reliability and reusability of the future TPS, stand-off TPS constructed of heat resistance panel, inner insulator, and posts mounting the panel on the body has attracted attention. Stand-off TPS has complicated structure, and some uncertainties such as material properties, dimensions, and aerodynamic heating condition affect the performance. Therefore, it is necessary in developing stand-off TPS to evaluate reliability with considering the effects of these uncertainties. At first, the heating experiment, heat transfer analysis and heat displacement analysis with simple stand-off TPS were conducted. In order to evaluate the results of heating experiment, we created the response surface from the results of heat transfer analysis. With created response surface, we conducted the sensitivity analyses and evaluated uncertainties in heating experiment. Then, the heating experiment, heat transfer analysis and sensitivity analysis with plane-type stand-off TPS were conducted. With the results of Monte-Carlo simulation, we evaluated uncertainties quantitatively, and finally proposed probabilistic thermal design method of stand-off TPS.