小控制杆对矩形柱尾流旋涡脱落的抑制  

On small element to suppress vortex shedding from a rectangular cylinder

作　　者：郑博文[1] 邵传平[1] 张洪军[1] 

机构地区：[1]中国计量学院计量测试工程学院,浙江杭州310018

出　　处：《中国计量学院学报》2011年第3期228-236,共9页Journal of China Jiliang University

基　　金：国家自然科学基金资助项目(No.10872188);浙江省自然科学基金资助项目(No.Y6100267)

摘　　要：采用小控制杆方法对主柱宽厚比B/H为2.0和3.0的两种矩形柱尾流的旋涡脱落进行了抑制实验.实验在风洞中进行,雷诺数(Re)范围为1.5×103至5.5×103,控制杆与矩形柱长度相同,两者相互平行放置.对三种不同宽度的控制杆进行了实验,小杆宽厚比分别为b/H=0.2,0.32和0.4.流动显示和热线测量结果表明:在柱体附近存在一个有效区,控制杆位于此区内时,柱体两侧的旋涡脱落被抑制.另外还存在一个单侧有效区,当控制杆位于该区内时,柱体一侧的旋涡脱落被抑制,而另一侧未被抑制,形成"单侧旋涡脱落现象".文中还研究了小杆宽厚比、矩形柱宽厚比和雷诺数对有效区和单侧有效区的影响,发现b/H增大时,有效区和单侧有效区不是扩大,而是有所缩小;当B/H增大时,有效区和单侧有效区扩大,而且有效区由一个变为两个;Re增大时,有效区和单侧有效区略有缩小.A small element was used to suppress vortex shedding from a rectangular cylinder at Reynolds numbers in the range of 1.5×103-5.5×103.The cylinder and element were of the same length and placed parallel to each other.The control parameters were the size and position of the element.Three elements of width b/H=0.2,0.32 and 0.4 were tested respectively.The results of smoke wire visualization and hot-wire measurement show that,it exists an effective zone of element position,in which vortex shedding from both sides of the cylinder is suppressed.There also exists a unilateral effective zone of element position,in which the phenomenon of unilateral vortex shedding occurs.The influences of element size,width to thickness ratio of the cylinder and Reynolds number were investigated.With the increase of element size b/H from 0.2 to 0.4,the effective and unilateral effective zones shrink slightly,which was different from the conclusion of the suppression of vortex shedding from a circular or a square cylinder by the element method.With the increase of width to thickness ratio of the cylinder B/H from 2.0 to 3.0,the zones enlarge rapidly.At B/H=3.0,the effective zone split into two separate parts,the first part is larger and the second part is smaller than the zone at B/H=2.0.With increasing of Re,the effective zone and unilateral effective zone shrink slightly.

关 键 词：流动控制 旋涡脱落 矩形柱 控制杆 

分 类 号：TB9-55[一般工业技术—计量学]