非定常不稳定气固两相流动的离散涡数值仿真 Ⅲ .非定常不稳定气固两相流动中颗粒运动与旋涡的相关结构  

NUMERICAL SIMULATION FOR UNSTEADY AND UNSTABLE GAS-PARTICLE TWO-PHASE FLOWS USING DISCRETE VORTEX METHOD Ⅲ.The Interrelated Structure Between Particle Motion and Vortices in Unsteady and Unstable Gas-Particle Two-Phase Flow Fields

作　　者：黄远东[1] 吴文权[1] 王远成[1] 张红武[2] 王光谦[2] 

机构地区：[1]上海理工大学,上海200093 [2]清华大学土木水利学院,北京100084

出　　处：《郑州工程学院学报》2003年第1期4-5,共2页

基　　金：国家自然科学基金资助项目(59876023);上海理工大学博士科研启动基金资助项目(X375)

摘　　要：基于气固两相流动的离散涡模型与数值仿真方法,分别模拟了与重力方向垂直和与重力方向平行的平面内气固两相圆柱绕流(其中颗粒的St数为1.0),得到了流场中颗粒分布与旋涡分布的时间序列,由此进一步证明了高雷诺数下的二维气固两相流动中固体颗粒运动与流体旋涡存在着明确的相关结构:气体流经圆柱体时产生不稳定的剧烈分离流动,在圆柱绕流的尾迹区内存在着复杂的旋涡发展演化过程,由于流体旋涡对其周围固体颗粒的诱导作用,使得在尾迹区内中等尺度(St～o(1.0))的固体颗粒从均匀气固混合物中分离出来而往旋涡区运动,并最终在旋涡结构的外沿聚集.A numerical investigation on the twodimensional gasparticle twophase flows passing a circular cylinder at high Reynoldes number is carried out by using the Discrete Vortex Method (DVM) and the distributions of vortices and particles in the unsteady and unstable flow field are obtained. The numerical results demonstrate that the definite interrelated structures exist between the particle motion and the vortices in two dimensional gaspartcle twophase flows: the motion of intermediate size particles (St-o (1 .0)) is obviously influenced by the vortices. While gas passes a circular cylinder at high Reynoldes number, unstable flow with massive separation is formed, the complicated movement of vortices exists in the wake region, the intermediate size particles are separated from the gasparticle mixture, then move toward the wake vortex region, and finally concentrate near the outer edges of vortex structure.

关 键 词：非定常不稳定气固两相流动 颗粒运动 旋涡 离散涡 数值仿真 运动规律 

分 类 号：O351[理学—流体力学]