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首页> 外文期刊>Mechanical systems and signal processing >Noise attenuation and performance study of a small-sized contra-rotating fan with microperforated casing treatments
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Noise attenuation and performance study of a small-sized contra-rotating fan with microperforated casing treatments

机译：小型对抗旋转风扇的噪声衰减和微型套管处理的性能研究

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摘要

This study investigates the benefits of noise control for a small-sized contra-rotating (CR) fan using microperforated-panel (MPP) casing treatments over the rotor. Several configurations of this type of casing treatment were proposed and then simulated with the finite element method (FEM) to determine their acoustic performance. In general, the FEM simulations indicated that the configurations of placing the treatment over the front rotor are more acoustically effective than those over the rear rotor. Experimentally, it was found that each axial row of holes of the MPP casing behaves like a stator vane, interacting with the fan rotor and thus generating a noisy interaction tone. However, such a tone can be sufficiently suppressed by optimizing the row numbers at the design stage of the MPP casing to increase the interaction mode and frequency. Experimental results further showed that for the treatment over the front rotor, the fan performance was not significantly influenced, especially in the flow rate region above stall point, while for the treatment over the rear rotor, a pressure loss of no more than 10 Pa was perceived, particularly in the flow rate region around the fan design point. Acoustically, the former was able to reduce overall noise throughout the flow rate region, with a maximum noise reduction of 3.5 dBA around the design point, whereas the latter increased overall noise slightly. Moreover, an enlarged volume lowering cavity stiffness for the treatment over the front rotor was found to improve the reduction of overall noise by 0.7 dBA (from 2.8 dBA to 3.5 dBA) as well as to attenuate rotor-alone tones effectively, of which the front treatment with the regular cavity failed in noise reduction. In contrast, no substantial enhancements of noise reduction were noticed for the rear treatment with an enlarged cavity. It is anticipated that the current investigation can provide a reference for controlling CR fan noise with MPP casing treatments.
机译：本研究调查了使用在转子上方的微型电池面板（MPP）套管处理的小型对抗旋转（CR）风扇的噪声控制的益处。提出了这种类型的套管处理的几种配置，然后用有限元方法（FEM）模拟以确定它们的声学性能。通常，有限元模拟表明将处理在前转子上放置在前转子上的配置比后转子上的那些。实验地，发现MPP壳体的每个轴向孔的孔的行为类似于定子叶片，与风扇转子相互作用，从而产生嘈杂的相互作用。然而，通过在MPP壳体的设计阶段优化行数以增加交互模式和频率，可以充分地抑制这种色调。实验结果进一步表明，为了处理前转子，风扇性能没有显着影响，特别是在上面的流量区域，而在后转子上的处理，不超过10Pa的压力损失感知，特别是在风扇设计点周围的流量区域中。声学上，前者能够在整个流速区域降低整体噪音，在设计点周围的最大降噪3.5 dBa，而后者略微增加了整体噪音。此外，发现用于在前转子上处理的扩大体积降低腔刚度，以提高0.7dBa（从2.8dBA到3.5dBa）的整体噪声的降低以及有效衰减转子单独的色调，其中用常规腔处理处理降噪失败。相比之下，通过扩大腔的后处理没有注意到降噪的显着增强。预计目前的研究可以提供具有MPP套管处理的CR风扇噪声的参考。

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  • 来源
    《Mechanical systems and signal processing》 |2021年第1期|107086.1-107086.16|共16页
  • 作者

    Bin Dong; Dan Xie; Fan He; Lixi Huang;

  • 作者单位

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

    College of Astronautics Northwestern Polytechnical University Xi'an Shaanxi 710072 China Department of Mechanical Engineering The Hong Kong Polytechnic University 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;

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

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  • 正文语种 eng
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  • 关键词

    Contra-rotating fan; Noise attenuation; Microperforated-panel casing treatment; Finite element method; Casing-rotor interaction; Performance study;

    机译：对抗旋转风扇;噪音衰减;微型电池面板套管处理;有限元法;套管 - 转子相互作用;绩效研究;

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