脉动流方柱绕流特性研究  

Numerical Simulation of the Pulsating Flow Past a Square Cylinder

作　　者：林纬[1,2] 喻九阳[1,2] 郑小涛[2] 聂思皓[2] 徐成[2] 

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070 [2]武汉工程大学机电工程学院,湖北武汉430074

出　　处：《工程热物理学报》2014年第2期338-341,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.50976080);武汉工程大学科学研究基金(No.14125061)

摘　　要：本文数值模拟雷诺数Re=i00的条件下，脉动流振幅和频率分别为0．2≤A≤0．8和0≤fp≤20Hz时方柱绕流特性。通过数值计算得到方柱绕流的升、阻力系数，涡脱频率及尾涡特性，且稳定流下计算结果与文献结果一致。研究结果表明脉动流是一种有效的主动流动控制方法；在脉动流频率，p为1．2—2．6自然涡脱频率fsn时，旋涡脱落频率存在“锁定”现象；在锁定范围内，尾涡形成区域变短，时均阻力系数显著增大，且在脉动流频率等于两倍频率时，时均阻力系数达到峰值；随着振幅的增大，频率“锁定”范围增大。Two-dimensional numerical simulation is performed to understand the effect of flow pulsation on the flow from a square cylinder at Re = 100. The effects of flow pulsation amplitude （0.2≤A≤0.8） and frequency （0≤fp≤20Hz Hz） on the flow are presented. The Strouhal number of vortices shedding, drag coefficient for non-pulsating flow are good agreement with the previously published data. The result shows that the pulsating flow is an effective active flow controlling method. In the range of fp/fsn=1.2~2.6, the lock-on phenomenon occurs and the vortex formation region becomes shorter. The time-averaged drag coefficient shows a peak when the pulsating frequency fp is about twice the natural vortex shedding frequency fsn. The lock-on regime broadens with the pulsation amplitude increases.

关 键 词：方柱 脉动流 锁定 

分 类 号：TB126[理学—工程力学]