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A case study of localization and identification of noise sources from a pitch and a stall regulated wind turbine

机译：变桨和失速调节风轮机噪声源定位与识别的案例研究

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摘要

We have experimentally identified the noise-generation mechanisms of large modern upwind wind turbines (WTs). First, the sound measurement procedures of IEC 61400-11 were used in the field test, and noise emissions from two WTs were evaluated: a stall-controlled WT with powers of 1.5 MW and a pitch-regulated WT with powers of 660 kW. One-third octave band levels were normalized using the scale law for the velocity dependence of the inflow broadband noise and airfoil self-noise. The results showed that for the 1.5 MW WT, inflow turbulence noise was dominant over the whole frequency range. For the 660 kW WT, the inflow broadband noise did not contribute across the whole audible frequency range. The distribution of noise sources in the rotor plane was visualized using a beam-forming measurement system (B&K 7768, 7752, and WA0890) consisting of 48 microphones. The array results for the 660 kW WT indicated that all noise was produced during the downward movement of the blades. This finding was in good agreement with theoretical results obtained using an empirical formula that includes the effects of the convective amplification, directivity, and flow-speed dependence of the turbulence boundary-layer trailing edge noise. This agreement implies that this trailing edge noise is dominant over the whole frequency range in the case of the 660 kW WT.
机译：我们已经通过实验确定了大型现代迎风式风力发电机（WTs）的噪声产生机理。首先，在现场测试中使用了IEC 61400-11的声音测量程序，并对两个WT发出的噪声进行了评估：功率为1.5 MW的失速控制WT和功率为660 kW的变桨调节WT。使用比例定律对三分之一的八度音阶水平进行归一化，以适应流入宽带噪声和机翼自噪声的速度依赖性。结果表明，对于1.5 MW WT，在整个频率范围内，流入湍流噪声占主导地位。对于660 kW WT，流入的宽带噪声在整个可听频率范围内没有贡献。使用由48个麦克风组成的波束形成测量系统（B＆K 7768、7752和WA0890）可视化转子平面中的噪声源分布。 660 kW WT的阵列结果表明，所有噪音都是在叶片向下运动期间产生的。这一发现与使用经验公式获得的理论结果高度吻合，该经验公式包括对流放大，方向性和湍流边界层后缘噪声的流速相关性的影响。该协议意味着在660 kW WT的情况下，该后沿噪声在整个频率范围内均占主导地位。

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  • 来源
    《Applied Acoustics》 |2012年第8期|p.817-827|共11页
  • 作者

    Gwang-Se Lee; Cheolung Cheong; Su-Hyun Shin; Sung-Soo Jung;

  • 作者单位

    School of Mechanical Engineering, Pusan National University, Pusan 609-735, Republic of Korea;

    School of Mechanical Engineering, Pusan National University, Pusan 609-735, Republic of Korea;

    School of Mechanical Engineering, Pusan National University, Pusan 609-735, Republic of Korea;

    Fluid Flow/Acoustics & Vibration Center, Division of Physical Metrology, Korea Research Institute of Standards and Science, Daejeon, Republic of Korea;

  • 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

    wind turbine noise; aeroacoustics; fan broadband noise; trailing edge noise; beam-forming technique;

    机译：风力发电机噪声航空声学风扇宽带噪声;后缘噪声;波束形成技术;

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