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固体发动机燃烧室部分凝相粒子在飞行过载作用下产生沉积,严重影响发动机工作性能。通过确定燃烧室粒子参数和建立燃烧室内两相流场数值方法,获得了发动机不同轴向过载下粒子运动及沉积规律。与试验数据进行对比分析,验证了计算方法的准确性。数值结果表明,随着轴向过载增大,后封头及喷管潜入段粒子沉积质量逐渐增大。沉积粒子粒径大于凝相粒子平均值,即粒子粒径越大,越容易沉积。轴向过载增大,减小了粒子在发动机内部的驻留时间,凝相粒子平均驻留时间均大于0.13 s。
Part of the solid engine combustion chamber coagulation particles in the flight overloaded under the action of sedimentation, seriously affecting the engine performance. By determining the parameters of the combustion chamber and establishing the numerical method of the two-phase flow field in the combustion chamber, the particle motion and deposition under different axial overloading conditions were obtained. Compared with the experimental data, it verifies the accuracy of the calculation method. The numerical results show that as the axial overload increases, the deposition mass of the backseat and submerged segment of the nozzle gradually increases. Sediment particle size is greater than the average coagulation particles, that is, the larger the particle size, the more easily deposited. Axial overload increases, reducing the residence time of particles in the engine, the average residence time of coagulation particles are greater than 0.13 s.