颗粒两相流自由剪切层大涡模拟  

Large Eddy Simulation of Two-phase Free Shear-layer with Particles

作　　者：吴海燕[1] 王昱[1] 孙明波[1] 汪洪波[1] 周进[1] 

机构地区：[1]国防科技大学航天与材料工程学院

出　　处：《航空计算技术》2008年第3期10-14,共5页Aeronautical Computing Technique

基　　金：国家自然科学基金(90505009)

摘　　要：采用大涡模拟(LES)方法数值仿真了可压缩流自由剪切层内颗粒两相流流场结构。气相控制方程采用二维盒式滤波法滤除小于网格尺度的小涡以得到LES控制方程,而流场中小涡对大涡的影响采用k-ωSST湍流模型模拟。在Lagrange坐标系下用颗粒轨道模型仿真颗粒运动,用双线性插值方法实现Eu ler坐标系到Lagrange坐标系的转换,并考虑了颗粒速度和温度的改变对气相流场的反作用。分析了仿真结果中气相自由剪切层的涡结构特性,不同St数颗粒在流场中的运动特性,颗粒对流场的反作用效果,得到了合理的结论。The two- phase compressible free shear- layer with particles was calculated by the method of large eddy simulation（LES）. To get the LES equations,the control equations of gas phase were filtered to get rid of the small eddies,whose scales were smaller than those of grid, and the box- filter function was introduced in those courses. Then the influence of small eddies in the fluid field was simulated by the k- to SST turbulence model. The flow of particles phase was simulated by track model in Lagrange coordinate system, and the bilinear interpolation method was applied to realize the transform from Euler coordinate to Lagrange coordinate ;the feed back to gas phase which arose from the velocity and temperature of particles were studied in the program. At last ,the structure characteristics of eddies in free shear- layer of gas phase, the movement of particles with different St, and the effect of the feed back which arose from particles were analyzed, and the reasonable conclusion was reached.

关 键 词：两相流 自由剪切层 大涡模拟 

分 类 号：V430[航空宇航科学与技术—航空宇航推进理论与工程]