摘要
针对V沟槽结构抑制涡激振动(VIV)的问题,在Re=7.4×10^(3)的情况下,对光滑圆柱和表面带有V沟槽圆柱的尾迹进行了对比研究。建立循环水槽装置进行试验,并采用粒子图像测速(PIV)技术和正交分解(POD)方法,来测量和研究光滑圆柱和表面带有V沟槽圆柱的尾流特性。研究结果表明:相比于光滑圆柱,V沟槽圆柱的再循环区的长度分别延长了0.183D,0.432D,0.499D,这意味着V沟槽结构会影响旋涡的尺度;表面带有V沟槽圆柱的POD模态能量相比光滑圆柱都有所减小,其分别减少了4.91%,26.72%,29.98%,这说明V沟槽结构抑制了漩涡的脱落过程,延缓了涡街的形成;同时,V沟槽结构对POD模态系数的波动大小以及POD模态系数的相关性也有一定的影响。因此,使用POD方法研究V沟槽圆柱后流流动特性是可行的。
For the suppression effect of the V-grooved structure on vortex-induced vibration(VIV),in the case of Re=7.4×10^(3),a comparative study of the wakes behind circular cylinders with the V-grooved surface and smooth cylinder surface was performed.A recirculation water tank was established for the experiment,and particle image velocimetry(PIV)and proper orthogonal decomposition(POD)were employed to measure and study the wake characteristics of smooth cylinders and circular cylinders with the V-grooved surface.The results indicate that compared to the smooth cylinder,the length of the recirculation region behind the V-grooved cylinder is extended by 0.183D,0.432D and 0.499D respectively,which means that V-grooved structure affects the scale of vortex.The POD mode energy of the circular cylinders with the V-grooved surface is smaller than that of the smooth cylinder,which is decreased by 4.91%,26.72%and 29.98%,this indicates that the V-grooved structure suppresses the vortex shedding process and delays the formation of vortex streets.Meanwhile,the V-grooved structure has a certain influence on the POD mode coefficients and the correlation of POD mode coefficients.So,it is feasible to use the POD method to study the flow characteristics of the V-grooved cylinder.
作者
晏飞
王德强
YAN Fei;WANG Deqiang(School of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《流体机械》
CSCD
北大核心
2022年第5期8-14,31,共8页
Fluid Machinery
基金
江苏省自然科学基金项目(BK20191459)。
关键词
涡激振动
粒子图像测速技术
圆柱绕流
正交分解
vortex-induced vibration
particle image velocimetry
flow around a cylinder
proper orthogonal decomposition
