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Vortex shedding from tandem cylinders

机译：来自串联气缸的漩涡脱落

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摘要

An experimental investigation is conducted on the flow around tandem cylinders for ranges of diameter ratio d/D = 0.25-1.0, spacing ratio L/d = 5.5-20, and Reynolds number Re = 0.8 x 10(4)-2.42 x 10(4), where d and D are the diameters of the upstream and downstream cylinders, respectively, L is the distance from the upstream cylinder center to the forward stagnation point of the downstream one. The focus is given on examining the effects of d/D, L/d and Re on Strouhal number St, flow structures and fluid forces measured using hotwire, particle image velocimetry (PIV) and load cell measurement techniques, respectively. Changes in d/D and L/d in the ranges examined lead to five flow regimes, namely lock-in, intermittent lock-in, no lock-in, subharmonic lock-in and shear-layer reattachment regimes. Time-mean drag coefficient (CD) and fluctuating drag and lift coefficients (C-D' and C-L') are more sensitive to L/d than d/D. The scenario is opposite for St where d/D is more prominent than L/d to change the St. The detailed facet of the dependence on d/D and L/d of C-D, C-D', C-L' and St is discussed based on shear-layer velocity, approaching velocity, vortex formation length, and wake width.
机译：在串联圆柱体周围的流动上进行实验研究，用于直径比D / D = 0.25-1.0，间距比L / D = 5.5-20，雷诺数Re = 0.8×10（4）-2.42×10（ 4），其中D和D是上游和下游圆筒的直径，分别是从上游气缸中心到下游的向前停滞点的距离。侧重于检测使用Hotwire，粒子图像速度（PIV）和称重传感器测量技术测量的D / D，L / D和RE在Strouhal Number ST，流动结构和流体力的效果。所检测的范围内的D / D和L / D的变化导致了五个流动制度，即锁定，间歇锁定，无锁定，子发锁和剪切层重新连接制度。时间平均阻力系数（CD）和波动的阻力和升力系数（C-D'和C-L'）对L / D比D / D更敏感。该方案对于D / D比L / D更加突出的ST，更改ST。讨论了CD，C-D'，CL'和ST的D / D和L / D依赖的详细方面基于剪切层速度，接近速度，涡旋形成长度和唤醒宽度。

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    Alam Md. Mahbub; Elhimer Mehdi; Wang Longjun; Lo Jacono David; Wong C. W.;

  • 作者单位

    Harbin Inst Technol Shenzhen Grad Sch Inst Turbulence Noise Vibrat Interact &

    Control Shenzhen 518055 Peoples R China;

    Harbin Inst Technol Shenzhen Grad Sch Inst Turbulence Noise Vibrat Interact &

    Control Shenzhen 518055 Peoples R China;

    Harbin Inst Technol Shenzhen Grad Sch Inst Turbulence Noise Vibrat Interact &

    Control Shenzhen 518055 Peoples R China;

    Univ Toulouse CNRS Inst Mecan Fluides Toulouse INPT UPS Toulouse France;

    Harbin Inst Technol Shenzhen Grad Sch Inst Turbulence Noise Vibrat Interact &

    Control Shenzhen 518055 Peoples R China;

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  • 正文语种 eng
  • 中图分类 流体力学;
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