驻波场中圆柱形换热管外声流特性的数值研究  

Numerical study on the characteristics of the acoustic streaming outside a cylindrical heat exchanger in a standing wave field

作　　者：杨延锋 姜根山[2] 姜羽 YANG Yanfeng;JIANG Genshan;JIANG Yu(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;School of Mathematics and Physics,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206 [2]华北电力大学数理学院,北京102206

出　　处：《振动与冲击》2021年第6期41-48,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(12074118,11674093);河北省自然基金(A2019502160);国家重点实验室资助项目(SKLA201808)。

摘　　要：基于非线性Navier-Stokes方程推导了一般性的声流控制方程,并利用有限元软件COMSOL对平面驻波声场中单根圆柱形换热管和双圆柱形换热管外包含二阶流场信息的Navier-Stokes方程进行全域求解,得到了一阶和二阶流场信息。研究了雷诺数Re和斯特劳哈尔数Sr对换热管外声流结构的影响规律。研究发现:随Re和Sr的增大,换热管边界层内的涡流区域变小,直至消失,而边界层外的涡流区域逐渐增大;且单换热管外涡流个数由8个减少到4个,双换热管外涡流个数从12个减少到8个。此外,边界层内和边界层外的涡流结构呈反向旋转;边界层外流场沿着振荡方向远离换热管,而在垂直方向流向换热管。Based on the nonlinear Navier-Stokes equation,the general acoustic streaming control equation was derived.The N-S equations containing the second order flow field information of a single cylindrical heat exchange tube and a double cylindrical heat exchange tube in the plane standing wave sound field were solved in whole domain by using the finite element software COMSOL.The first and second order flow field information were obtained.The effects of Reynolds number Re and Strouhal number Sr on the structure of acoustic streaming outside the heat exchange tube were studied.It is found that with the increase of Re and Sr,the vortex area in the boundary layer of the heat exchanger tube decreases until it disappears,while the vortex area outside the boundary layer increases gradually.The number of vortices outside the single heat exchanger tube is reduced from 8 to 4,and the number of vortices outside the double heat exchanger tube is reduced from 12 to 8.In addition,the vortex structures inside and outside the boundary layer are all reverse rotation.The flow field outside the boundary layer goes far away from the heat exchange tube along the direction of oscillation,and flows toward the heat exchange tube in the vertical direction.

关 键 词：声流 NAVIER-STOKES方程 驻波 换热管 边界层 

分 类 号：TK124[动力工程及工程热物理—工程热物理]