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中文摘要：
根据高硅氧/酚醛复合材料的烧蚀机理,建立了包括烧蚀退移层、化学反应边界层、液态层、炭化层、热解层、原始材料层的自外向内的物理模型,针对平板烧蚀问题,预报了热导率、比定压热容、驻点焓值等热物理性能对高硅氧/酚醛复合材料的表面烧蚀后退率、壁面温度、气化烧蚀速率、热阻塞效应因子、气化分数等烧蚀性能的影响。结果表明,低热导率能使表面烧蚀后退率明显降低,但却使壁面温度、热阻塞效应因子及材料的气化分数升高;而高的比定压热容则能大大降低表面烧蚀后退率和壁面温度;随驻点焓值的增加,表面烧蚀后退率和壁面温度都增大。
英文摘要：
According to ablation mechanism of high silica/phenolic composite,a physical model,considering ablation recession layer,chemical reaction boundary layer,liquid layer,charring layer,pyrolytic layer and original material layer,was established successively.For the flat plate ablation problem,the effect of the thermal physical properties,such as coefficient of thermal conductivity,specific heat capacity at constant pressure and stagnation enthalpy,on the ablation properties was studied.The ablation properties were embodied by the surface ablation recession rate,wall temperature,gasification ablation rate,thermal blockade effect factor and gasification fraction.The predicted results show that surface ablation recession rate decreases dramatically with the decrease of coefficient of thermal conductivity,while wall temperature,thermal blockade effect factor and gasification fraction increase reversely.The large specific heat capacity at constant pressure can decrease surface ablation recession rate and wall temperature greatly.Surface ablation recession rate and wall temperature increase with the increase of the stagnation enthalpy.
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