基于Euler-Lagrange模型的电弧风洞喷管两相流模拟  

Simulation of 2-Phase Flow in the Nozzle of the Arc-Heated Wind Tunnel Based on the Eulerian-Lagrangian Model

作　　者：罗万清 李海燕[2] 梁剑寒[1] 

机构地区：[1]国防科技大学高超声速冲压发动机技术重点实验室,长沙410073 [2]中国空气动力研究与发展中心超高速空气动力研究所,四川绵阳621000

出　　处：《应用数学和力学》2020年第1期16-26,共11页Applied Mathematics and Mechanics

摘　　要：电弧风洞设备中试验气体采用电弧加热,电极烧蚀产生部分微小金属颗粒进入喷管内部进而形成气粒两相流,由此对喷管流场特性和试验段模型上热载荷等的影响值得关注.通过改进时间步长提高了颗粒跟踪算法的计算效率,并基于动量守恒和能量守恒定律耦合喷管内部气相和颗粒相的流动,采用Euler-Lagrange模型建立了一定简化条件下喷管内部气粒两相流动的数值模拟方法,并对典型算例进行了模拟分析.研究表明在相同的颗粒质量分数条件下,颗粒越小,喷管出口区域的流场越均匀.如果颗粒相质量分数较小,喷管出口位置两相流场和纯气相流场差异不明显.该研究工作为深入研究电弧风洞内部两相流场特性奠定了基础.Due to the ablation of the electrode during the heating of test gas in the arc-heated wind tunnel,some tiny metal particles enter the nozzle to form gas-particle 2-phase flow,of which the effect is worthy of attention on the flow field in the nozzle and the heat load on the model of the test section.The computation efficiency of the particle tracking algorithm was im-proved through modification of the time step,with the gas-phase flow and the particle-phase flow coupled based on the conservation law of momentum and energy.By means of the Euleri-an-Lagrangian model,a numerical simulation method for the gas-particle 2-phase flow inside the nozzle was established under specific simplification,and some typical examples were simulated and analyzed.The research shows that,under the same particle mass fraction,the smaller the particle size is,the more uniform the flow field downstream of the nozzle will be.If the mass fraction of the particle phase is small,it will has little effect on the flow field parameters of the nozzle outlet.This work lays a foundation for further study of the 2-phase flow field characteristics inside the arc-heated wind tunnel.

关 键 词：电弧风洞 气粒两相流 Euler-Lagrange模型 数值模拟 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]