定常吸吹气作用下波浪圆柱主动减阻机制  

Active drag reduction mechanism for wavy cylinders under steady suction and blowing

作　　者：邹琳[1] 张毓辰 左红成 苗亚博 徐汉斌[1] ZOU Lin;ZHANG Yuchen;ZUO Hongcheng;MIAO Yabo;XU Hanbin(College of Electromechanical Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《河海大学学报（自然科学版）》2024年第6期81-89,共9页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金项目(12372232,11972268)。

摘　　要：针对圆柱绕流减阻抑振问题,对波浪圆柱采用定常吸吹气主动控制手段,在雷诺数Re=3000情况下,利用大涡模拟数值方法,研究吸吹气方式、方位角(吹吸气装置与来流反方向夹角)、动量系数对波浪圆柱的升阻力特性、时均压力、速度分布、近尾迹流动结构发展及其减阻抑振的影响规律。结果表明:定常吸气控制比吹气控制对波浪圆柱减阻抑振效果更好;定常吸气方位角位于迎风面时波浪圆柱的升阻力系数随动量系数的增大而减小,位于背风面时则呈先减小后增大再减小趋势,这主要归因于定常吸气通过吸收低速度流体延缓流动分离,削弱了尾流的顺流向雷诺应力和横流向雷诺应力,降低了柱体前后表面的压差,波浪圆柱的近尾迹宽度在横向上显著变窄;在适当的吸气动量系数及方位角工况下,Saddle截面近尾迹回流区基本被消除,下游出现“带状涡”,升阻力波动得到了显著控制,平均阻力系数较未受控制波浪圆柱减少83.84%。In order to solve the problem of drag reduction and vibration suppression of the cylinder flow,a numerical study has been conducted to investigate several key factors affecting the performance of a wavy cylinder.The study with the 3000 Reynolds number explores the influence of suction and blowing,azimuth(defined as the angle between the suction and blowing device and the opposite direction of incoming flow),and momentum coefficient on various aspects,including the lift and drag characteristics of the cylinder,the distribution of time-averaged pressure and velocity,and the development of flow structures in the near wake.To accomplish this,on the shape of the wave surface,the study uses the steady suction and blowing active control means with the use of the numerical method of large-eddy simulation(LES).The results show that steady suction control proves to be more effective than blowing control in terms of drag reduction and vibration suppression in the wavy cylinder.The lift and drag coefficient of the wavy cylinder decreases with the increase of momentum coefficient when the steady suction azimuth is located on the windward side.Conversely,when the steady suction azimuth is on the leeward side,a pattern emerges:the coefficients initially decrease,then increase,and finally decrease again.This observed behavior can be primarily attributed to the delaying effect of steady suction on flow separation,achieved by absorbing low-velocity fluids.Consequently,this process weakens the downstream and transverse Reynolds stresses in the wake,thereby reducing the pressure difference between the cylinder’s front and back surfaces.Moreover,it notably narrows the width of the near wake of the wavy cylinder in the transverse direction.Under the appropriate suction momentum coefficient and azimuth working condition,the recirculation zone of Saddle section near wake is basically eliminated,and the downstream appears“band vortex”,where the lift and drag fluctuation is significantly controlled and the mean drag coefficient is r

关 键 词：波浪圆柱 定常吸吹气 大涡模拟 减阻 抑振 

分 类 号：TV211.3[水利工程—水文学及水资源]