大振幅横向振荡柱体尾流的控制

Suppression of the wakes downstream of a transversely oscillating cylinder with largeamplitude

引用小窄条控制件对不同旋涡脱落模式进行尾流控制.在振幅比A/D=1.0,无量纲振荡频率feD/V∞=0.413,雷诺数为1 200条件下找到了2P旋涡脱落模式并对其进行控制;在振幅比为0.4,无量纲振荡频率0.21条件下找到了2S旋涡脱落模式并对其进行控制;在振幅比为1.5,无量纲振荡频率0.189条件下找到了P+S旋涡脱落模式并对其进行控制.烟线流动显示实验和热线测速.实验结果表明,单窄条对2S模式旋涡脱落的抑制作用不明显,对2P模式旋涡脱落抑制作用显著,双窄条对P+S模式旋涡脱落的抑制在一定位置下有显著控制效果.

A small strip was used to control wake vortices in different vortex shedding modes.The 2Pvortex shedding mode was amplitude ratio A/D=1.0,non-dimensional oscillation frequencies feD/V∞=0.413,and Reynolds number 1 200.The 2Svortex shedding mode was amplitude ratio=0.4,non-dimensional oscillation frequencies of 0.21,and was controlled by a stationary narrow strip.The P＋S vortex shedding mode was amplitude ratio=1.5,non-dimensional oscillation frequencies=0.189,and was controlled by a stationary narrow strip.The results of flow visualization and velocity fluctuation measurement show that single narrow strip has no effect on inhibiting 2Smode vortex shedding but has significant inhibitory effect on 2Pmode vortex shedding.Similarly,the suppression of vortex shedding in the P＋S mode is significantly controlled by the double strips in a certain position.