Effect of thermal physical properties on ablation properties of high silica/phenolic composite

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.