横向过载下考虑颗粒聚合行为的颗粒阻尼特性研究

The transverse overload of solid rocket motor will change the trajectory of condensed particle, increase the collision probability between particles and particles, particles and wall, change the particle size and concentration distribution of condensed particles, consequently reduce the damping characteristics of particles leading to the combustion instability. Based on the CFD-DEM numerical simulation method, coupled with the particle collision-aggregation model, was conducted the numerical simulation of particle collision, aggregation and movement under overload. The numerical results reveal the variation characteristics of particle size distribution, particle space distribution and particle damping characteristics under different transverse overloads. Under transverse overload, the particles significantly move and accumulate in transverse direction, and then the collision probability between particles increases, and the collision probability increases significantly with the increase of overload time. Large particle size particles are easily generated due to collisions polymerization between particles. The generation of large particle size particles makes the spatial distribution of particles more uneven, which leads to a significant reduction in the damping value of particles, and ultimately affects the combustion stability of the motor.