关键词: 固体推进剂火箭发动机;防热;隔热涂层;烧蚀性能

Abstract: EPDM(Ethylene Propylene Diene Monomer)is used as the insulation on chamber wall of SPRM.It is a good protective material of charring type.During being heated it formed the charring and pyrolytic layers.Under ablation and attack of gas and particle,it gradually thinned out and took off great quantity of heat,and the chamber wall was effectively protected.The ablation model of EPDM was built using the aerodynamic thermochemical ablation mechanism and the double control mechanism of diffusion and chemical dynamics.The erosion of gas and particle is regarded also.Simultaneously,the ablative rate was predicted by coupling of ablation with heat conduction under moving boundaries.The predicted ablative rate by the model is good agreement with test results

Key words: Solid propellant rocket motor;Thermal protection;Barrier coating;Ablation property