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Airfoil Self-Noise Reduction by Gradient Distributed Porous Trailing Edges

机译：梯度分布式多孔尾部边缘翼型自降噪

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摘要

Porous material-inspired noise reduction has been proved to be an effective method to reduce airfoil self-noise during the last few decades. However, the used porous materials in previous studies generally have homogenous physical properties. In order to obtain higher airfoil self-noise reduction, in this paper, nonhomogenous porous trailing edges are proposed, which feature a piecewise gradient distributed property in pores per inch (ppi). Detailed acoustic measurements performed in the 0.55 x 0.4-m aeroacoustic wind tunnel showed that the proposed gradient distributed porous trailing edges can achieve a peak noise reduction of up to 43.68 dB and a maximum decrease in overall sound pressure level of up to 19.72 dB, mainly due to the mitigation of vortex-shedding noise of the laminar flow. For turbulent flow, the noise-reduction ability is weakened but can still reduce up to 5.25 dB of turbulent broadband noise. A parameter study of gradient distributed properties on noise reduction revealed several design principles for the proposed modifications, i.e., the porous treatments with larger porous coverage and located at the last 5% chord length of the airfoil gain better noise reduction. Moreover, airfoil self-noise reduction is enhanced when the porous treatments provide a gradual transition from the solid main body to that of the downstream free flow. (C) 2021 American Society of Civil Engineers.
机译：已经证明了多孔材料启发降噪是在过去几十年中减少翼型自我噪音的有效方法。然而，先前研究中使用的多孔材料通常具有均匀的物理性质。为了获得更高的翼型自降噪，在本文中，提出了非源于多孔尾部的边缘，其特征在每英寸（PPI）的孔中具有分段梯度分布特性。在0.55×0.4米的航空声风洞中进行的详细声学测量显示，所提出的梯度分布式多孔落后边缘可以实现高达43.68dB的峰值降噪，总体声压力水平最高可达19.72 dB的最大降低。由于层流的涡流噪声噪声的减轻。对于湍流，降噪能力削弱，但仍可降低高达5.25dB的湍流宽带噪声。梯度分布性能对降噪的参数研究显示了所提出的修饰的几种设计原理，即具有较大多孔覆盖物的多孔处理，位于翼型的最后5％弦长，增强了降噪更好。此外，当多孔处理提供从固体主体逐渐过渡到下游自由流动的逐渐过渡时，增加了翼型的自降噪。 （c）2021年美国土木工程师协会。

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  • 来源
    《Journal of aerospace engineering》 |2021年第6期|04021075.1-04021075.14|共14页
  • 作者

    Wang Yong; Hao Nan-Song; Lu Xiang-Yu; Tong Fan; Song Yu-Bao;

  • 作者单位

    China Aerodynam Res & Dev Ctr State Key Lab Aerodynam Mianyang 621000 Sichuan Peoples R China|China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China;

    China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China;

    China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China;

    China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China;

    China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China;

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