粒子侵蚀模型及粒子侵蚀下绝热材料烧蚀数值计算

Particle erosion model and numerical simulation of ablation of insulation material eroded by particles

从粒子动力学参数出发,分析了粒子与炭化层相互作用机制,导出计算粒子对炭化层作用力,再根据强度理论,推导出粒子对炭化层的侵蚀模型。应用该模型,对实验发动机中粒子侵蚀下的绝热材料烧蚀进行了数值计算,计算中采用了燃气流动与烧蚀耦合计算方法,计算结果与实验结果基本一致,表明所建立的粒子侵蚀可用于固体火箭发动机中粒子侵蚀下绝热材料烧蚀的预估。

The mechanism of particle impacting on charing layer was analysed according to the parameters of particle dynamics.The formula that was used to calculate the force acting on charing layer by particle was deduced.The model used to calculate charing layer eroded by particles was set up by the strength theory,which was employed for the numerical calculation of ablation of insulation material in the test motor.The gas flow and erosion coupling calculation method was used. The results of calculation were basically consistent with that of the experiment,which indicates that the particle erosion model can be used for predication of ablation of insulation material eroded by particles in the solid rocket motor.