薄矩形柱绕流旋涡脱落的抑制  

SUPPRESSION OF VORTEX SHEDDING FROM THIN RECTANGULAR CYLINDERS

作　　者：邵传平[1] 林建忠[1] 魏庆鼎[2] 

机构地区：[1]中国计量学院流体检测与仿真研究所,杭州310018 [2]北京大学湍流与复杂系统研究国家重点实验室,北京100871

出　　处：《力学学报》2010年第4期615-622,共8页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金资助项目(10472124;10872188)~~

摘　　要：用窄条形控制件对截面宽度为B,厚度为H的矩形柱体绕流的旋涡脱落进行抑制.实验在风洞中进行,实验范围为B/H=2.0～5.0,Re=V∞H/ν=3.75×10^3～1.05×10^4.矩形柱的宽边B与来流平行,窄条与柱体等长,且两者轴线相互平行放置.窄条宽度为b/H=0.5,窄条厚度远小于其宽度;窄条位置可变,但窄条表面保持与来流垂直.尾流脉动速度测量和流动显示结果表明：当窄条位于一个有效区内时,矩形柱体两侧的旋涡脱落被抑制;而当窄条位于一个单侧有效区内时,矩形体一侧的旋涡脱落被抑制,在另一侧旋涡脱落却仍存在.有效区范围从矩形体的上游某点一直延续到矩形体的下游某点.单侧有效区将整个有效区围在其中.有效区和单侧有效区范围随着B/H的增大而增大,但随着Re的增大而减小.A strip cross-sectional element was used to suppress vortex shedding from thin rectangular cylinders with a width to thickness ratio range B/H of 2.0～5.0 at Reynolds number Re in the range of 3.75×10^3～1.05×10^4,where B and H are the width and thickness of the cylinder＇s cross-section,respectively.The cylinder surface in width is parallel to the oncoming flow.The element and the cylinder have the same length and their axes are parallel.The element＇s width is 0.5,and its thickness is small.The element＇s position is varied,and its main surface is perpendicular to the oncoming flow.Measurements of wake velocities,together with smoke wire visualization,show that,vortex shedding from both sides of the cylinder is suppressed if the element is placed at points within an effective zone,while mono-side vortex shedding is observed if the element is applied at points within a unilateral effective zone.The effective zone is from upstream the leading edge to downstream the trailing edge of the cylinder,and it is enclosed by the unilateral zone.The areas of the two zones increase with the growth of B/H and decrease with the growth of Reynolds number.

关 键 词：抑制 涡脱落 矩形柱 控制件 实验 

分 类 号：O357.41[理学—流体力学]