单颗粒尾涡特性的大涡模拟  

Large-eddy simulation of particle wake effects

作　　者：陈雷[1] 刘向军[1] 徐旭常[2] 

机构地区：[1]北京科技大学机械工程学院热能工程系,北京100083 [2]清华大学热能工程系,北京100084

出　　处：《北京科技大学学报》2006年第4期380-382,共3页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金项目(No.50406025)

摘　　要：稠密气固两相流中颗粒尾涡的存在对其他颗粒的运动及两相流场结构的影响不可忽略.本文采用大涡数值模拟的方法研究了气体流过一个100μm颗粒的尾涡特性,对比计算了在不同颗粒雷诺数Rep下颗粒尾涡的存在对局部气流速度、压力的影响.结果表明,Rep=100时尾涡影响区域的长度达颗粒粒径的5倍,颗粒前后最大压差达373·48Pa.Particle wake has obviously effects on particle-particle interactions and two-phase flow characteristics in dense gas-particle two-phase flow. The large eddy simulation method was used to study the flow field across a Ф100μm particle. The local streamline, velocity and pressure distribution at different Reynolds numbers Reo were calculated. The results reveal that at Rep = 100 the length of particle wake region is about 5 times the particle diameter and the corresponding maximum pressure difference is 373.48 Pa.

关 键 词：稠密气固两相流 颗粒 尾涡 大涡模拟 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]