尾部喷射对流向振荡柱体尾流旋涡脱落的抑制

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，乍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，雷诺娄Re=V∞D／慌围为2700-9800，柱体振荡幅值A／D=O．2，柱体振荡频率范围feD／V∞=0-0．36，其中亿为来沥速度，D为柱体直径．沿圆柱母线开一个与圆柱等长、宽度为h／D=O．015的缝隙，用于喷射空气．喷射麦度比W％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／比（或hVblDV∞）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辛效抑制．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fe／V∞和喷射速度比W亿（曼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身角对抑制效果的影响，并探讨了旋涡脱落抑制机理．

Suppression of vortex shedding from an oscillating cylinder by base blowing

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.