尾部喷射对流向振荡柱体尾流旋涡脱落的抑制  

Suppression of vortex shedding from an oscillating cylinder by base blowing

作　　者：陈野军[1] 邵传平[1] 

机构地区：[1]中国计量学院流体检测与仿真研究所,杭州310018

出　　处：《中国科学：物理学、力学、天文学》2012年第4期406-420,共15页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金资助项目(批准号:10872188)

摘　　要：强迫振荡柱体绕流旋涡脱落的抑制具有重要工程意义,但比静止柱体尾流的抑制更加困难,目前这方面的研究很少.本文采用尾部喷射方法对流向振荡圆柱尾流旋涡脱落进行抑制实验,雷诺数Re=V∞D/范围为2700–9800,柱体振荡幅值A/D=0.2,柱体振荡频率范围feD/V∞=0–0.36,其中V∞为来流速度,D为柱体直径.沿圆柱母线开一个与圆柱等长、宽度为h/D=0.015的缝隙,用于喷射空气.喷射速度比Vb/V∞范围为0–18,相应的流量比hVb/DV∞范围为0–0.27.风洞中的烟线显示和热线测量结果表明:当喷射速度比Vb/V∞(或hVb/DV∞)介于其下临界值和上临界值之间时,振荡柱体两侧的尾流旋涡脱落被有效抑制.发现在非锁频和锁频两种状态下均能抑制旋涡脱落.在振频feD/V∞和喷射速度比Vb/V∞(或hVb/DV∞)组成的平面坐标系内找出了有效抑制旋涡脱落的区域,研究了有效区域随雷诺数的变化和喷射角对抑制效果的影响,并探讨了旋涡脱落抑制机理.The method of base blowing was used to suppress vortex shedding from a circular cylinder oscillating in streamwise direction at Re=V∞D/v=-2700-9800, A/D=0.2 andfeD/V∞=O-0.36, where D was diameter of cylinder, V~ was velocity of on-coming stream, A and fe were respectively amplitude and frequency of cylinder oscillation. Air was blown out of the hollow cylinder through a span-wise slit of width h/D=0.015 and length nearly equal to axial scale of the cylinder. The test range of blow speed was Vb/V∞=0-18. Results of smokewire visualization and hotwire measurement in wind tunnel show that, vortex shedding in both the lockon and unlockon states can be suppressed by base blowing. The effective zone of vortex shedding suppression was found out in the plane coordinates of Vb/V∞ and feD/V∞. The effect of Reynolds number on the effective studied, and the suppression mechanism was discussed in the zone was investigated, the influence of blow angle was paper.

关 键 词：振荡圆柱绕流 旋涡脱落 尾部喷射 控制 

分 类 号：O353[理学—流体力学]