V沟槽圆柱后流流动特性
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江苏科技大学

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P751

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江苏省自然科学基金(BK20191459)


Flow Characteristics of V-grooved Cylinder Backflow
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jiangsu university of science and technology

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    摘要:

    为了了解V沟槽结构对涡激振动(VIV)的抑制作用,现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实验,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。结果表明:相比于光滑圆柱,V沟槽圆柱的再循环区的长度有所延长;表面带有V沟槽圆柱的POD模态能量小于光滑圆柱的POD模态能量,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模态系数和POD模态的相干结构也有一定的影响。可见用POD方法研究V沟槽圆柱后流流动特性是可行的。

    Abstract:

    In order to understand the suppression effect of the V-groove structure on vortex-induced vibration (VIV), a comparative study of the wakes behind circular cylinders with the V-groove surface and smooth cylinder surface is performed. A recirculation water tank is established for the experiment, and particle image velocimetry (PIV) is employed to measure research the wake characteristics of smooth cylinders and circular cylinders with the V-groove surface. The result show that in comparison to the smooth cylinder, the length of the recirculation region behind the V-groove cylinder is extended. The POD mode energy of the circular cylinders with the V-groove surface is smaller than that of the smooth cylinder, this indicates that the V-groove structure suppresses the vortex shedding process and delays the formation of vortex streets. At the same time, the V-groove structure has a certain influence on POD mode coefficients and the coherent structure of POD modes. It is concluded that it is feasible to use the POD method to study the flow characteristics of the V-groove cylinder.

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晏飞,王德强. V沟槽圆柱后流流动特性[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-03-20
  • 最后修改日期:2021-05-10
  • 录用日期:2021-05-10
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