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Theoretical characterization and modal directivity investigation of the interaction noise for a small contra-rotating fan

机译：小型对转风扇相互作用噪声的理论表征和模态方向性研究

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摘要

The interaction noise radiated from contra-rotating (CR) fans is theoretically characterized, focusing on the unsteady lift force caused by aerodynamic interaction between the front and rear rotors. In the formulation, blade section misalignments leading to blade sweep and lean are considered. It is demonstrated that the conventional stator-rotor interaction noise problem is a special case of the present model, whereas the rotor-stator case is not. The derived formula is intended to enhance the understanding of the interaction noise mechanisms and help devise noise control methods in CR fans. Modal directivities of lower-order interaction tones are investigated with the derived formula as an application example, which is generally validated by the experimental results. To extract the interaction tones from the measured acoustic data, the Vold-Kalman filter is applied, with which the influences of broadband noise are excluded. It is found that the modal directivity of interaction noise for CR fans is more complicated than that for conventional fans. Theoretically, the leading order thrust noise is found to peak along the rotation axis and plummet in the rotational plane. For the first-order mode, the predicted directivity exhibits a forward-leaning characteristic, which is in good agreement with the experimental result. The predicted directivity patterns of second- and third-order modes are dominated by the drag noise component and peak in the direction near the rotational plane.
机译：从理论上对反向旋转（CR）风扇辐射的相互作用噪声进行了表征，重点是由前后转子之间的空气动力学相互作用引起的不稳定升力。在配方中，考虑了导致叶片扫掠和倾斜的叶片截面失准。结果表明，传统的定子－转子相互作用噪声问题是本模型的特例，而转子－定子情况则不是。导出的公式旨在增强对交互噪声机制的理解，并帮助设计CR风扇中的噪声控制方法。以推导公式为应用实例研究了低阶相互作用声调的模态方向性，这一点通常得到实验结果的验证。为了从测得的声学数据中提取相互作用音，应用了Vold-Kalman滤波器，排除了宽带噪声的影响。已经发现，CR风扇的交互噪声的模态方向性比传统风扇复杂。从理论上讲，发现前置推力噪声沿旋转轴达到峰值，并在旋转平面中直线下降。对于一阶模式，预测的方向性表现出前倾特性，与实验结果吻合良好。二阶和三阶模态的预测方向性模式受阻力噪声分量支配，并在旋转平面附近的方向上达到峰值。

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  • 来源
    《Mechanical systems and signal processing》 |2020年第1期|106362.1-106362.15|共15页
  • 作者

    Bin Dong; Changyong Jiang; Xiang Liu; Yi Deng; Lixi Huang;

  • 作者单位

    Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong Special Administrative Region China High Speed Aerodynamics Institute China Aerodynamics Research and Development Center No. 6 South Section Second Ring Road Mianyang Sichuan 621000 China Laboratory for Aerodynamics and Acoustics HKU-Zhejiang Institute of Research and Innovation Lin An Zhejiang 311305 China;

    Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong Special Administrative Region China College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China Laboratory for Aerodynamics and Acoustics HKU-Zhejiang Institute of Research and Innovation Lin An Zhejiang 311305 China;

    Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong Special Administrative Region China Laboratory for Aerodynamics and Acoustics HKU-Zhejiang Institute of Research and Innovation Lin An Zhejiang 311305 China;

    School of Chemical Engineering Sichuan University Chengdu Sichuan 610065 China;

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

    Contra-rotating fan; Interaction noise characterization; Modal directivity; Vold-Kalman filter;

    机译：对转风扇;交互噪声表征;模态方向性Vold-Kalman滤波器;

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