碳—酚醛烧蚀和热响应的理论分析与工程计算

本文分析了碳-酚醛的烧蚀机理和内部热响应特性,讨论了碳纤维的氧化、升华和碳-氮反应。指出热解气体注入边界层的作用主要是增加热阻塞效应和改变壁面组元浓度。热解气体流过材料碳层,起着降低碳层内部温度的作用。基于烧蚀机理和热响应特性的分析,给出了碳-酚醛烧蚀和内部热响应的理论计算方法,计算结果分别与固定状态和模拟再入轨道的变状态的电弧加热器的烧蚀和内部温度的试验结果作了比较,两者符合甚好。

ANALYSIS AND PREDICTION OF ABLATIVE ANDIN-DEPTH THERMAL RESPONSE PERFORMANCEFOR CARBON-PHENOLIC COMPOSITE

This paper is gone into details on the ablative mechanism and in-depth thermal response for carbon-phenolic composite. The oxida-tion and sublimation of carbon fibers and carbon-nitrogen reaction were discussed. The main effect of pyrolysis gas on surface behavior which increased heat blockage of boundary layer and varied the concentration of gas species are presented. The pyrolysis gas through the carbon layer can decrease enthalpy of carbon and temperature of carbon layer. A method was developed for predicting ablative performance and in-depth thermal response of carbon-phenolic composites . Analytical results were quite consistent with results of ARC-Jet test under steady heating and transient heating simulating ballistic re-entry.