过渡流下近壁单方柱绕流的实验研究  

Experimental Study on Flow Passed a Square Colum Near Wall in Transitional Flow

作　　者：谢福兴 翟少华 周磊 喜冠南[1] XIE Fu-xing;ZHAI Shao-hua;ZHOU Lei;XI Guan-nan(School of Mechanical Engineering,Nantong University,Jiangsu Nantong 226019,China)

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《机械设计与制造》2022年第11期44-47,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金—过渡流下分离与再附不稳定性及其传热强化机理(51476080)。

摘　　要：为了探究过渡流下不同雷诺数、不同间隙比的近壁方柱绕流的流动特性,该实验搭建了开式循环水槽,采用了粒子图像测速系统(PIV),对过渡流下近壁单方柱绕流进行了实验研究。结果表明:雷诺数、间隙比对方柱的速度场、涡量场等均有明显的影响。增大C/D,方柱尾流形态由单涡逐渐变为对称的涡对,尺度逐渐减小,当C/D<0.8时,壁面与方柱相互作用明显。增大Re,方柱尾流处速度矢量旋度及涡尺度均增大,当Re=200时,C/D对方柱绕流特性有明显的影响。In order to study the flow characteristics of flow passed a square column near wall with different Reynolds and gap ratios in transitional flow,an open-loop recirculating water tunnel is established in this experiment.The experimental study on flow passed a square column near wall under different Reynolds and gap ratios in transitional flow is carried out using particle image velocimetry(PIV).The results shows that the velocity field and vorticity field of square column are related to Reynold and gap ratio obviously.Increasing C/D,the flow characteristics of the wake of cylinder evolve from a single vortex to a symmetrical vortex pair,and the scale of vortex decreases gradually.When C/D<0.8,the wall interacts with the square column significantly.Increasing Re,the curl of the velocity vector and the vortex scale at the wake of the square column increase.When Re=200,C/D has a significant effect on the flow characteristics around the square column.

关 键 词：过渡流 近壁 间隙比 雷诺数 方柱 

分 类 号：TH16[机械工程—机械制造及自动化] TK124[动力工程及工程热物理—工程热物理]