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Ludwig Prandtl's envisage: elimination of von Karman vortex street with boundary-layer suction

机译：Ludwig Prandtl的设想：消除Von Karman Vortex Street，边界层抽吸

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摘要

The present study is a revisit to Ludwig Prandtl's elimination of von Karman vortex street behind a circular cylinder by using steady suction in the boundary layer. We show in particular the full-time vortex evolutions and vortex dynamics in the wake. The wind tunnel investigations are conducted at the Reynolds number (Re) of 2.0 × 10~4. Slot suction is implemented symmetrically on both lower and upper boundary layers of the cylindrical test model to modify the flow separation process and to eliminate the downstream vortex street. The boundary layer suction is described by the dimensionless momentum parameter of suction relative to the free-stream airflow. A high-speed particle image velocimetry system is employed in the present study to visualize the flow patterns and capture the wake dynamics of the natural and modified cylinders controlled with boundary-layer suction.
机译：目前的研究是通过在边界层中使用稳定抽吸的圆柱形圆柱体消除了Ludwig Prandtl的von Karman涡流街的重新审视。 我们特别展示了唤醒中的全日制涡旋演进和涡流动态。 风隧道调查在2.0×10〜4的雷诺数（RE）进行。 槽抽吸对称在圆柱测试模型的下边界层上对称实现，以改变流量分离过程并消除下游涡流街。 边界层吸入由相对于自由流气流的抽吸的无量纲动量参数描述。 本研究采用高速粒子图像速度系统，以可视化流动模式并捕获用边界层抽吸控制的天然和改性汽缸的唤醒动力学。

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  • 来源
    《Journal of visualization》 |2021年第2期|237-250|共14页
  • 作者

    Wenhan Yang; Yewei Huang; Donglai Gao; Wenli Chen;

  • 作者单位

    Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150090 China;

    Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150090 China;

    Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150090 China;

    Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150090 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Flow control; Von Karman vortex street; Boundary layer suction; Dimensionless momentum coefficient;

    机译：流量控制;von Karman vortex街;边界层抽吸;无量纲动量系数;

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