Thermal Response Analysis of Low Density Ablative Materials Subjected to High Temperature

摘要

Thermal response analysis of three highly porous carbon-based materials subjected to nitrogen arcjet heating environment produced in JAXA 1MW constrictor-type arcjet wind tunnel are studied using a developed flow computational method. Radiative transfers in all the materials under study are modeled using effective radiative conductivity evaluated through radiative extinction coefficients. The extinction coefficients are deduced from ray tracing calculation using X-ray CT models for the respective materials. Convective transfer from the gas occupying porous matrices of the materials is also modeled by solving conservation equations for gases within the pores of the material along with the material energy equation. In-depth temperature time histories comparison between calculation and measurement shows good agreement for each of the test pieces analyzed.