树脂基烧蚀材料细观传热特性预测

低密度树脂基烧蚀材料在近年来的深空探测等航天器上得到了广泛的应用,为了更好地提高其隔热能力,需要对其传热机理进行分析,尤其是基于细观尺度的传热分析可以更好地探究其传热机理。依据对树脂基烧蚀材料的细观结构观测和统计分析,建立了不同尺度的单胞理论模型,并将计算结果与实验值进行比较,给出参数化影响规律。同时,建立了有限元随机模型,与实验值进行比较,并给出了基于有限元的参数化影响规律。结果表明,建立的单胞理论模型与实验值的误差,对于两种树脂基烧蚀材料,分别为12%和7.6%左右,从而验证了建立的理论模型的正确性;随机模型所得导热系数值与实验值误差在10%以内,验证了随机模型的正确性。所建模型和参数化分析所得规律对于树脂基烧蚀材料隔热性能的提高和加工工艺的改进具有重要意义。

Prediction of meso-heat transfer characteristics of resin-based ablative materials

Low-density resin-based ablative materials have been widely used in spacecraft for deep space exploration in re-cent years.To improve their thermal insulation capacity,we need to conduct an analysis of the mechanism of heat transfer, especially meso-heat transfer,of the material.Based on microscopic observation and statistical analysis of the material,a theoretical model for the unit cells of different scales of the material was established.The calculated results were compared with the experimental values,and the influence of the parameters was given.A finite element stochastic model was also es-tablished.The calculated results were compared with the experimental values,and the influence of parameterization based on finite element was given.The results show that the error between the theoretical model and the experimental value is 12% and 7.6% for the two resin-based ablation materials respectively,and the correctness of the theoretical model is thus verified.The difference between the thermal conductivity values obtained with the stochastic model and the experimental values is less than 10%,verifying the correctness of the stochastic model.The model proposed and parameter analysis is of great significance for improvement of the thermal insulation performance and processing technology of the resin-based abla-tive material.