驻波场中圆柱形换热管外声流特性的数值研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (6) : 41-48.

论文

杨延锋1，姜根山2，姜羽2

作者信息 +

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

YANG Yanfeng1，JIANG Genshan2，JIANG Yu2

Author information +

文章历史 +

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。

Abstract

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.

导出引用

杨延锋1，姜根山2，姜羽2. 驻波场中圆柱形换热管外声流特性的数值研究[J]. 振动与冲击, 2021, 40(6): 41-48

YANG Yanfeng1，JIANG Genshan2，JIANG Yu2. Numerical study on the characteristics of the acoustic streaming outside a cylindrical heat exchanger in a standing wave field[J]. Journal of Vibration and Shock, 2021, 40(6): 41-48

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