横向振荡柱体尾流P+S模式及其演化研究  

Study on the P+S mode vortex shedding from a transverselyoscillating cylinder and its evolution

作　　者：郑之明 邵传平 ZHENG Zhiming;SHAO Chuanping(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018

出　　处：《中国计量大学学报》2020年第1期50-56,共7页Journal of China University of Metrology

基　　金：国家自然科学基金项目(No.11572305)。

摘　　要：目的:研究旋涡脱落模式及其抑制方案对各种工程建设的意义。方法:通过改变横向振荡柱体的振幅和振频找到尾流的P+S旋涡脱落模式(在一个振荡周期内,柱体一侧脱落一对旋涡,另一侧脱落一个单涡),并将两个宽度为b/D=0.32的窄条控制件对称地放置于柱体尾流中,观察其对柱体旋涡脱落的改变情况。采用RNG k-ε湍流模型进行数值模拟,并用流动显示和热线测量进行验证。结果:在振幅比A/D=1.5,无量纲振荡频率f eD/V∞=0.2,雷诺数Re=1200条件下,找到了P+S模式旋涡脱落,并发现窄条可将旋涡改变为2P或其他模式。结论:当窄条位于一定区域内时,可抑制漩涡脱落。Aims:Study on the vortex shedding mode and its suppression scheme for various engineering constructions.Methods:To study the P+S mode of vortex shedding(a pair of vortexes with opposite rotation direction shed on one side of the cylinder and a single vortex shed on the other side)from a transversely oscillating cylinder by changing the amplitude and the frequency,and to observe the alterations of the mode and strength of the vortex shedding caused by a pair of narrow strips of relative width b/D=0.32 placed symmetrically in the cylinder wake.numerical simulation is carried out by using RNG k-εturbulence model,and verified by flow visualization and hot-wire measurement.Results:The P+S mode was found at amplitude A/D=1.5,frequency f eD/V∞=0.2,and Reynolds number Re=1200,and it is changed to 2P or other modes by the set of the strips.Conclusions:Vortex shedding can be suppressed if the strips are placed at certain position.

关 键 词：振荡柱体 旋涡脱落 窄条控制件 

分 类 号：O357.5[理学—流体力学]