Abstract: As the accuracy of the ablation temperature field calculation of thermal protective composite materials was not high, a calculation method was established to analyze the carbon-based and silicon-based thermal protective material under specific thermal environment. Comparing the ablation temperature results with the simplified model and ground test results, the method in this study was proved to be reasonable. Several thermal parameters, thermal conductivity, density, surface emissivity, pyrolysis and carbide, were studied under specific thermal environment to analyze the influence law of the factors on the ablation heat transfer. The results show that the influence of various factors on the ablation heat transfer behavior is different. The thermal conductivity and the emissivity has a major contribution to the influence on internal and external temperature of the thermal protective material, respectively. The influence of the emissivity on the internal temperature is time-dependent. The activation energy has a certain impacts on the internal temperature of the material. Both the activation energy and thermal conductivity has significant impacts on the material pyrolysis carbonization process. The results provide an important theoretical basis to the correction of the ablative heat transfer calculation method.

Key words: specific thermal environment, influence law, ablative heat transfer, internal temperature