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| Noise prediction of wind turbines |
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Abstract Based on the blade shape and the radiated noise frequency spectrum of wind turbines in China, the noise prediction model for wind turbines with blunt trailing edges is modified. Noise of wind turbines of three kinds is measured at 13 sampling points, which is also predicted using the modified model. The results show that the modified model could well reflect the noise attenuation of wind turbines. When the distance between rotor center and receiver is greater than 1.5 times the rotor blade diameter, the difference between the measurement values and the predicted values of the modified model is within ±2.5 dB(A). Using the modified model, sound power level and directivity index of different kinds of wind turbines can be calculated. So the noise prediction model can be simplified if the distance between rotor center and receiver is greater than 3 times the rotor blade diameter.
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Received: 14 September 2011
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