摘要
文中利用Fluent软件对层流(Re=200)与湍流(Re=3900)两种流动状态下的旋转圆柱绕流进行数值模拟研究,分析了不同转速比α(0≤α≤8)下旋转圆柱绕流特性,对比研究升力系数C_(L)、阻力系数C_(D)、斯特劳哈尔数Sr及尾部涡流情况.结果表明:随着旋转比的增加,两种流态下均发现了五种尾流结构形态,但在高旋转比下存在区别;水动力系数随旋转比的变化规律一致,升力系数均值增大,阻力系数均值先减小后增大,Sr随旋转比的增大而减小,且第二不稳定阶段的Sr值比第一不稳定阶段要小很多;与层流相比,湍流情况下升阻力系数均值(时间均值)随旋转比变化速率较缓,而Sr值随旋转比变化较快.
The numerical simulation of the flow around a two-dimensional rotating cylinder in laminar flow(Re=200)and turbulent flow(Re=3900)was conducted by using the computational fluid dynamics software of Fluent.The flow characteristics around the rotating cylinder at different rotation rate,α(0≤α≤8)were analyzed.The lift coefficient C_(L),drag coefficient C_(D),Strouhal number Sr and wake vortex structure under laminar and turbulent flow regimes were compared.The results show that with the increase of rotation ratio,five wake structures are found in both flow patterns,but there are differences at high rotation ratio.The variation law of hydrodynamic coefficient with the rotation ratio is consistent,the mean lift coefficient increases,the mean drag coefficient first decreases and then increases,and the Strouhal number decreases with the increase of rotation ratio.The value of the second unstable stage is much smaller than that of the first unstable stage.Compared with laminar flow,the mean value of lift-drag coefficient(time mean value)in turbulent flow changes slowly with the rotation ratio,while the Sr value changes rapidly with the rotation ratio.
作者
唐卫国
陈威
吴轶钢
陈硕
李晓彬
TANG Weiguo;CHEN Wei;WU Yigang;CHEN Shuo;LI Xiaobin(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;School of Science,Wuhan University of Technology,Wuhan 430063,China;Wuhan University of Technology,Green&Smart River-Sea-Going Ship,Cruise and Yacht Research Center,Wuhan 430063,China;China Classification Society,Wuhan Branch,Wuhan 430000,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2022年第2期247-253,共7页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
博士科研启动基金(40120268)
国家自然科学基金(51979213)。
关键词
旋转圆柱绕流
数值模拟
水动力系数
尾流结构
旋转比
flow around a rotating cylinder
numerical simulation
hydrodynamic coefficient
wake structures
rotation rate
