羽流中固体颗粒在真空环境下分布的数值仿真  

Numerical simulation on particle distribution of the plume flow in vacuum

作　　者：李中华[1] 李志辉[1] 吴俊林[1] 彭傲平[1] 

机构地区：[1]中国空气动力研究与发展中心超高速所,绵阳621000

出　　处：《固体火箭技术》2014年第6期797-803,共7页Journal of Solid Rocket Technology

基　　金：973计划(2014CB744100);国家自然科学基金(91016027;11325212);国防基础科研基金(51313030104)

摘　　要：通过对气-固两相间动量和能量相互作用解耦处理,建立了一种适于模拟真空环境气固两相混合物羽流的DSMC双向耦合算法与固体颗粒空间输运变化特性的TPMC计算技术。仿真了固体火箭发动机两相羽流流场和固体颗粒在远离发动机喷口数十公里空间扩散运动分布特性,通过将计算结果与典型文献结果及理论分析比较确认,证实本文方法的准确可靠性。结果表明,固体颗粒对气相的扩散有一定的阻滞作用;仅在离发动机喷口一定距离,气相对固体颗粒有较大影响,致颗粒温度下降、速度增加;颗粒温度随发动机喷口距离增大而减小,一直要在远离喷口上百公里颗粒温度才随轴向位置趋于平衡,且不同尺寸的颗粒温度差别较大,对指导外层空间高真空环境气固两相羽流传输影响工程研制具有重要意义。A numerical simulation approach was presented to simulate rarefied two-phase mixture plume flow by applying two-way coupling technique of DSMC method. The interaction between rarefied gas and solid particles was dealt with decoupling compu-tation of momentum and energy exchange between phases. The TPMC computing technology was also developed to solve the space transport characteristics of solid particles in distant field space. The two-phase plume flow field and particle distribution characteris-tics far away from the engine nozzle were simulated by the DSMC and TPMC method. It is indicated that the present methods and models are correct by the comparison of the computed results with the typical confirmed results from the reference and theoretical a-nalysis. There exists some retarded elasticity in gas phase diffusion of solid particles to some extent. From the engine nozzle dis-tance, gas and solid particles have a greater impact caused with temperature drop and increases of the speed of particles. The granu-lar temperature away from the nozzle exit tends to balance, and the particle temperature is very different with different size of parti-cles. It is shown that there are more intensely interaction between phases in case of higher number density, and particle size affects diffusing range and temperature distribution. The results are of great significance to guide the vacuum gas-solid two-phase plume transmission.

关 键 词：稀薄气体 DSMC方法 两相流 双向耦合 TPMC方法 高空羽流 

分 类 号：V438[航空宇航科学与技术—航空宇航推进理论与工程]