Suppression of vortex shedding of circular cylinder in shallow water by a splitter plate
Suppression of vortex shedding of circular cylinder in shallow water by a splitter plate
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DOI：
10.1016/j.flowmeasinst.2005.04.004
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发表时间：
2005-08-01
影响因子：
2.2
通讯作者：
Tumen, NF
中科院分区：
文献类型：
--
作者：
Akilli, H;Sahin, B;Tumen, NF
通过在圆柱下游不同位置插入分流板来控制浅水中垂直圆柱的绕流特性。分离板具有固定长度，其等于圆柱体的直径，D = 50 mm。使用具有不同厚度的三个板（T/D = 0.016、0.04和0.08）来检查板厚度T的影响。圆筒底部和分隔板前缘之间的差距以12.5 mm的增量从0到100 mm连续增加。采用粒子图像测速技术（PIV）测量了雷诺数Re = 5000时圆柱体尾迹区的瞬时速度矢量场。使用200幅瞬时图像获得了平均速度矢量场、相应的涡量场、流线拓扑和湍流统计。实验中水面高度保持在25 mm，当差距比（G/D）在0 ~ 1.75 D之间时，分流板对旋涡脱落的抑制效果显著。对于G/D = 1.75，归一化雷诺应力的峰值为0.0158，比裸圆柱体的浓度小约8.5倍。当分流板位于2D位置时，没有观察到板的影响。(c)2005爱思唯尔有限公司保留所有权利。
The flow behavior around a vertical circular cylinder placed in shallow water was controlled by a splitter plate inserted at various locations downstream of the cylinder. The splitter plate has a fixed length which is equal to the diameter of the cylinder, D = 50 mm. The effect of plate thickness, T, was examined using three plates with different thicknesses, T/D = 0.016, 0.04 and 0.08. The gap between the base of the cylinder and the leading edge of the splitter plate was increased successively from 0 to 100 mm with 12.5 mm increments. Particle Image Velocimetry (PIV) was used to measure the instantaneous velocity vector field in the wake region at Reynolds number Re = 5000 based on the cylinder diameter. The mean velocity vector field, corresponding vorticity field and streamline topology and turbulence statistics were obtained using 200 instantaneous images. The water height was kept constant at 25 mm during the experiments.The splitter plate has a substantial effect on the suppression of the vortex shedding for the gap ratio (G/D) between 0 and 1.75D. For G/D = 1.75, the normalized Reynolds stress has a peak value of 0.0158, which is approximately 8.5 times smaller than the concentrations occurring for the bare cylinder. When the splitter plate was located at 2D location, no effect of the plate was observed. (c) 2005 Elsevier Ltd. All rights reserved.