不同雷诺数条件下静止管道车环状缝隙流场数值模拟  

Numerical simulation of annular gap flow field of static pipeline vehicle under different Reynolds numbers

作　　者：贾晓萌[1] 孙西欢[1] 李永业[1] JIA Xiaomeng;SUN Xihuan;LI Yongye(School of Hydro Science&Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学水利科学与工程学院,太原030024

出　　处：《振动与冲击》2021年第3期10-18,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51179116,50579044,51109155)。

摘　　要：为了探究雷诺数对于静边界环状缝隙流场的影响,采用Fluent软件对雷诺数为115513、154018、192522三种工况下静止管道车环状缝隙流场进行了数值模拟,并通过物理试验进行验证,结果表明:同一雷诺数条件下,在环状缝隙入口处流速最大,之后沿管道车车身方向,环状缝隙流流速呈现先减小后增大的变化趋势,且环状缝隙流流速大于管道内水流的平均流速;各横断面环状缝隙流场均以管道中心呈同心圆分布,即半径相同的各点环状缝隙流流速值大致相同,且从管道车壁面到管壁面方向环状缝隙流流速呈现二次抛物线的变化形式;不同雷诺数条件下,管道内压强值沿程变化趋势大致相同,管道车上游位置处压强沿程呈现逐渐降低的变化趋势,环状缝隙内部和管道车下游位置处的压强值沿程呈现先升高后降低的变化趋势;随着雷诺数的增加,环状缝隙流流速值与压强值和涡量值均呈现出逐渐增大的变化趋势;数值模拟结果同试验结果基本吻合,两者所得环状缝隙流流速最大相对误差不超过7%,表明通过数值模拟来研究管道车环状缝隙流场的方法是可行的。In order to explore the influence of Reynolds number on flow field of annular gap with static boundary,the software Fluent was used to simulate annular gap flow fields of a static pipeline vehicle under Reynolds numbers of 115513,154018 and 192522,respectively,and the results were verified with tests.Results showed that under the same Reynolds number,the flow velocity at the entrance of annular gap is the largest,and then along the direction of vehicle body,the velocity of annular gap flow firstly decreases and then increases,and the velocity of annular gap flow is larger than the average velocity of water flow in the pipe;the flow field of annular gap in each cross-section is concentric circle distribution with respect to the pipe center line,that is,the velocity value of annular gap at various points with the same radius is approximately the same,and flow velocities of annular gap along the direction from pipe vehicle wall to pipe wall present a form of quadratic parabola;under different Reynolds numbers,the variation trend of pressure value in pipe is roughly the same,the pressure at upstream position of the pipeline vehicle gradually decreases along the way,the pressure value inside annular gap and the downstream position of the pipeline vehicle increases firstly and then decreases along the way;with increase in Reynolds number,the velocity value,pressure value and vorticity value of annular gap all have a gradually increasing trend;numerical simulation results agree well with test ones,the maximum relative error between the two results is less than 7%,so the numerical simulation method is feasible.

关 键 词：雷诺数 环状缝隙流 管道车 数值模拟 试验验证 

分 类 号：TH137[机械工程—机械制造及自动化] TV134.1[水利工程—水力学及河流动力学]