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中文核心期刊
Volume 54 Issue 11
Nov.  2022
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Qiu Xiang, Wu Haodong, Tao Yizhou, Li Jiahua, Zhou Jiankang, Liu Yulu. Experimental study on evolution of wake structures in flow past the circular cylinder placed near the wall. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(11): 3042-3057 doi: 10.6052/0459-1879-22-403
Citation: Qiu Xiang, Wu Haodong, Tao Yizhou, Li Jiahua, Zhou Jiankang, Liu Yulu. Experimental study on evolution of wake structures in flow past the circular cylinder placed near the wall. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(11): 3042-3057 doi: 10.6052/0459-1879-22-403

EXPERIMENTAL STUDY ON EVOLUTION OF WAKE STRUCTURES IN FLOW PAST THE CIRCULAR CYLINDER PLACED NEAR THE WALL

doi: 10.6052/0459-1879-22-403
  • Received Date: 2022-09-01
  • Accepted Date: 2022-09-27
  • Available Online: 2022-09-28
  • Publish Date: 2022-11-18
  • The experimental measurement of the flow field around the circular cylinder near the wall is carried out by using the Particle Image Velocimetry. The characteristics of the flow regime under different Reynolds numbers (${Re} = {1500} \sim {5540}$) together with three different gap ratios (${G \mathord{\left/ {\vphantom {G D}} \right. } D}{ \;= 0}{.5}$, ${G \mathord{\left/ {\vphantom {G D}} \right. } D}{\; = 1}{.0}$, ${G \mathord{\left/ {\vphantom {G D}} \right. } D}{ \;= 1}{.5}$) are studied. The experiment results shows that for the case of ${G \mathord{\left/ {\vphantom {G D}} \right. } D}{ \;= 0}{.5}$, with the increasing of Reynolds number, the recirculation zone behind the cylinder is gradually symmetrical about the centerline of the cylinder while its size is decreasing, and the size of the separation bubble on the wall also decreases gradually. The experiment reveals that the cylindrical wake and the gap flow perform differently while the Reynolds numbers ${{Re} _t}$ between ${Re} = {3000} \sim {3200}$. When the Reynolds number is smaller than ${{Re} _t}$, a small separation bubble will form on the front wall of the cylinder, which hinders the flow of upstream fluid through the gap and reduces the intensity of the gap flow, and then deviates from the wall. At ${Re} { \;= 1500}$, the vortex shedding frequency increases with the decrease of the gap ratio. And with the decrease of gap ratio, the vortex shedding frequency increases first and then decreases in a small range (${0}{.185} \leqslant St \leqslant {0}{.227}$) for ${Re} \geqslant {3000}$. The Reynolds number has a significant influence on the flow characteristics, especially for the case of small gap ratios. At ${G \mathord{\left/ {\vphantom {G D}} \right. } D}{ \;= 0}{.5}$, the secondary vortex deviates from the wall and moves upward to the position close to the upper wake vortex, and the vortex merging process appears between the upper wake vortex and the secondary vortex for the ${Re} { \;= 1500}$. As the Reynolds number increases to ${Re} { \;= 5540}$, the secondary vortex does not merge with the upper wake vortex, and the secondary vortex directly interacts with the lower wake vortex. At ${G \mathord{\left/ {\vphantom {G D}} \right. } D}{ \;= 1}{.0}$ and ${G \mathord{\left/ {\vphantom {G D}} \right. } D}{ \;= 1}{.5}$, the energy carried by the secondary vortex is decreasing gradually with the increasing of Reynolds number.

     

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