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Control of cylinder wake flow and noise through a downstream porous treatment

机译：通过下游多孔处理控制汽缸尾流和噪音

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摘要

Various passive and active methods have been developed to control flow separation from bluff bodies. However, these methods require adjusting features of the solid surface, such as modifying its geometry or porosity, or applying external force or momentum. This paper develops an off-body-based method, without adjusting any features of the solid surface, for controlling the unsteady flow separation by fixing porous materials downstream of bluff bodies. Numerical study on flow past a circular cylinder at a subcritical Reynolds number is performed, and the result indicates that the added downstream porous material changes flow in the wake and re-laminarizes the turbulent flow around the curved cylinder surface, reducing the wall pressure fluctuation around the cylinder. Therefore, the associated aerodynamic noise is reduced greatly. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：已经开发了各种被动和主动方法来控制与钝体的流动分离。然而，这些方法需要调节固体表面的特征，例如改变其几何形状或孔隙率，或施加外力或动量。本文开发了一种基于离体的方法，无需调整固体表面的任何特征，而是通过将多孔材料固定在钝体的下游来控制不稳定的流动分离。对亚临界雷诺数下通过圆柱体的流动进行了数值研究，结果表明，所添加的下游多孔材料改变了尾流中的流动，并使弯曲曲面周围的湍流重新分层，从而减小了壁面压力波动。圆柱体。因此，大大降低了相关的空气动力学噪声。 （C）2019 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2019年第5期|233-243|共11页
  • 作者

    Xu Chen; Mao Yijun; Hu Zhiwei;

  • 作者单位

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China|Univ Southampton, Fac Engn & Phys Sci, Southampton SO17 1BJ, Hants, England;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China|Univ Southampton, Fac Engn & Phys Sci, Southampton SO17 1BJ, Hants, England;

    Univ Southampton, Fac Engn & Phys Sci, Southampton SO17 1BJ, Hants, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Open-cell metal foam; Flow separation; Flow control; Aerodynamic noise;

    机译：开孔金属泡沫流动分离流动控制气动噪声;

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