喷管两相流耦合数值模拟与粒子热增量预测

含有氧化铝粒子的两相流是固体火箭发动机喷管流场的重要特征.在有限体积方法框架下,采用基于热增量试验数据的粒子壁面反弹模型以及基于粒子轨道的单元内颗粒源(PSIC,Particle Source in Cell)两相流耦合算法,对喷管内两相流流场及粒子撞击产生的壁面热增量进行了计算和分析,研究了氧化铝粒子尺寸对粒子轨道分布和喷管壁面热增量分布的影响规律.研究结果表明:喷管扩张段内粒子稀疏区域范围随粒子直径增加而增大;粒子热增量只分布于喷管收缩段内,粒子直径越大,产生的壁面热增量越强.

Two-phase flow numerical simulation and particle impingement heating prediction in SRM nozzle

The aluminum oxide particle laden two-phase flow is an important characteristic of the solid rocket motor(SRM) nozzle flow field.Numerical investigations were conducted to understand the two-phase flow field and the surface heat increment caused by particle impingement in SRM nozzle.The Eulerian Navier-Stokes equations for the gas-phase flow were solved by finite volume method.The particle source in cell(PSIC) two-phase coupling regime based on Lagrangian particle tracking scheme and the particle-wall rebounding model based on experimental data were applied in the computations.The influences of aluminum oxide particle size on the particle trajectories and the surface heat increment distribution were studied and investigated.The results show that in the nozzle expansion section,the particle free zone increases as the particle diameter increases;the peak value of nozzle surface heat increment rises up as the particle diameter increases;the surface heat increment occurs completely in the nozzle convergent section.