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Influence of wall proximity on flow around two tandem circular cylinders

机译：壁面距离对两个串联圆柱体周围流动的影响

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摘要

An experimental study was conducted to investigate the flow around two tandem cylinders placed near and parallel to a plane wall. The Reynolds number based on the cylinder diameter (D) was 6300. The cylinder centre-to-centre spacing ratio (L~*=L/D) was varied from 1.5 to 6, and the gap-height-to-cylinder-diameter ratio (G~*=G/D) from 0.15 to 2. The flow fields were measured using Particle Image Veiocimetry (PIV), in conjunction with measurements of fluid dynamic forces (drag and lift) on the downstream cylinder using load cell. The flow strongly depends on the combined value of G~* and L~*. With reference to G~*, the flow could be classified as vortex-shedding suppression regime (G~*＜0.3), intermediate-gap regime (0.3 ＜ G~* ＜ 1) where vortex shedding occurs but is influenced by wall proximity, and large-gap regime (G~* ＞ 1) where the wall influence becomes negligible. Similarly, three categories can be identified as a function oft*, namely, extended-body regime 1 ＜L~* ＜2, reattachment regime at 2 ＜L~* ＜ 4, and impinging regime at L~* ＞ 4. Variations of dynamic drag and lift coefficients, spectra, Strouhal numbers, and Reynolds shear stress are also presented to characterize the different flow regimes in the G~*-L~* plane.
机译：进行了一项实验研究，以研究围绕并平行于平面壁放置的两个串联圆柱体周围的流动。基于气缸直径（D）的雷诺数为6300。气缸中心距比（L〜* = L / D）从1.5更改为6，间隙高度与气缸直径比率（G〜* = G / D）从0.15到2。流场使用粒子图像测速（PIV）进行测量，并使用称重传感器测量下游气缸上的流体动力（阻力和升力）。流量很大程度上取决于G〜*和L〜*的总和。参照G〜*，该流动可分为涡流脱落抑制机制（G〜* ＜0.3），中间间隙机制（0.3 ＜G〜* ＜1），其中发生涡旋脱落但受壁的接近程度影响，以及壁隙影响可以忽略不计的大间隙状态（G〜*＞ 1）。类似地，可以将三个类别确定为t *的函数，即扩展体状态1 ＜L〜* ＜2，重新附着状态2 ＜L〜* ＜4和撞击状态L〜*＞ 4。还给出了动态阻力和升力系数，光谱，斯特劳哈尔数和雷诺剪切应力，以表征G〜* -L〜*平面中的不同流动形式。

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