基于SPH方法的凝胶推进剂一次雾化仿真研究

Simulation research on first atomization characteristics of gelled propellant based on SPH method

一次雾化中存在传统网格法难以解决的自由表面、大变形等问题,本文将光滑粒子流体动力学(SPH)方法探索性地应用于凝胶推进剂一次雾化仿真研究。模型粒子数保持在105左右,在高剪切速率下,将凝胶推进剂看作高粘度牛顿流体,研究了撞击速度、撞击角度以及凝胶推进剂物性参数对雾化效果的影响,仿真结果与实验结论基本一致。

As the free surface and large deformation problem in first atomization were both challenges to traditional grid based method, the first atomization characteristics of gelled propellant using Smoothed Particle Hydrodynamics （SPH） method was investi- gated. The computational models were simplified from the doublet like-on-like impinging jet injector. The particle number of each computational model was controlled at level of 10^5. As the shear rate during the impinging process was high,gelled propellant was treated as high viscous Newtonian fluid. The influences of velocity,impinging angle and viscosity were investigated. The simulation results show an agreement with analysis and experiment, which proves that SPH is an efficient method to solve the first atomization problem.