Wind Tunnel Test of Noise Reduction of Wind Turbine Airfoil with Trailing Edge Serrations
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摘要: 随着风能产业的发展，风力机降噪成为行业发展的必然，尾缘锯齿是降低叶片自噪声的有效手段。多年来，国内外许多学者通过数值模拟、风洞实验和整机测量等手段开展了风力机尾缘锯齿降噪研究。在西北工业大学NF-3风洞的二元试验段开展翼型尾缘锯齿降噪实验研究，提出了通过尾迹来甄选噪声测量传感器的方法，并采用A计权以及1/8倍频程的方法进行噪声频谱分析。结果表明，通过尾迹甄选出的传感器可作为噪声分析数据来源；在风力机翼型后缘安装尾缘锯齿来降低噪声是可行的，降噪的频率为翼型自噪声的中高频段；使用A计权、1/8倍频程的方法表示噪声频谱能很好地进行噪声源分析。Abstract: With the development of the wind energy industry, reduction of wind turbine noise becomes inevitable. The airfoil with trailing edge serrations is an effective means to reduce the self-noise of the blade. Over the years, domestic and foreign scholars have conducted much research on noise reduction of wind turbine serrated trailing edge in numerical simulations, wind tunnel experiments, and on-site measurements. The experiments are all carried out in NF-3 low speed wind tunnel of Northwestern Polytechnical University. The chosen sensors are selected by that it isn't located in the wake area, and using A-weighted and 1/8-octave band methods for noise spectrum analysis. The results show that the signal from chosen sensor could be used as data source for airfoil noise analysis. Installing trailing edge serrations on the wind turbine airfoil is feasible to reduce noise, and the frequency of noise reduction is the mid-high frequency range of the airfoil self-noise. Using A-weighted and 1/8-octave band methods can perform noise source analysis well.
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Key words:
- wind tunnel /
- wind turbine /
- airfoil /
- noise reduction /
- experiment /
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表 3 各工况翼型噪声声压级(6号传感器)
雷诺数Re 迎角 噪声值/dB(A) 干净翼型 尾缘锯齿 2.0 ×106 6° 104.21 101.11 8° 104.17 101.38 3.0×106 6° 110.83 109.34 8° 110.73 109.21 4.0×106 6° 116.46 115.65 8° 116.25 115.62 
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