旋转圆柱气动特性的雷诺数效应研究  

Reynolds number effect on aerodynamic characteristics of a rotating circular cylinder

作　　者：马文勇 刘剑寒[1] 张晓斌 李玉学 MA Wenyong;LIU Jianhan;ZHANG Xiaobin;LI Yuxue(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;State Key Lab of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,石家庄050043 [3]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043

出　　处：《振动与冲击》2022年第7期46-52,共7页Journal of Vibration and Shock

基　　金：河北省自然科学基金(E2021210053,E2019210031)。

摘　　要：流体流过旋转圆柱形成的不对称流场会在圆柱上产生侧向流致力(升力),这种流致力在航海和风能利用方面有很广的应用前景,旋转圆柱气动力特性的研究对这些应用有重要的意义。通过测量旋转圆柱体在不同转速和风速下的气动力和尾流场,讨论了不同雷诺数范围旋转圆柱的气动特性。结果表明雷诺数是影响旋转圆柱气动力的重要因素:亚临界区旋转圆柱的侧向力主要体现为马格努斯效应,升力指向切向速度与风速相同一侧,随着转速比的增大而增大;在临界区,圆柱的转动会诱发流体在切向速度与风速相反一侧形成再附现象,形成指向该侧的升力,随着转速的提高,升力不会发生明显变化。此外,雷诺数效应会受到转速的影响:随着转速提高,发生阻力损失的雷诺数会变小,出现再附现象的雷诺数范围变大。The asymmetric flow field around a rotating cylinder can produce a lateral force(lift) on the cylinder.This force has a wide application prospect in navigation and wind energy utilization.Studying aerodynamic characteristics of a rotating cylinder is of great significance for these applications.By measuring aerodynamic force and wake field of a rotating cylinder under different rotating speeds and wind speeds,aerodynamic characteristics of a rotating cylinder within different Reynolds number ranges were discussed here.The results showed that Reynolds number is an important factor to affect aerodynamic force of a rotating cylinder,the lift of a rotating cylinder in subcritical region mainly reveals Magnus effect,it points to the side of tangential velocity and wind speed with the same direction,and increases with increase in rotating speed ratio;in critical region,cylinder rotating can induce reattachment of fluid at the side of tangential velocity direction being opposite to that of wind speed to form a lift pointing to this side,with increase in rotating speed,the lift can’t vary obviously;rotating speed can affect Reynolds number effect,with increase in rotating speed,Reynolds number with resistance loss can become smaller,and the range of Reynolds number with reattachment phenomenon can become larger.

关 键 词：旋转圆柱 风洞试验 气动特性 转速比 雷诺数 

分 类 号：TU318.1[建筑科学—结构工程]