To study the spectral distribution characteristics of aerodynamic noise of self ventilated and direct cooling wind turbines,a hybrid computational aerodynamic acoustics method was used to simulate the aerodynamic noise of self ventilated and direct cooling wind turbines.The flow rate,noise sound pressure level,and one-third octave band of the motor at rated speed were tested.Through simulation and experimental comparison,the flow simulation error was 4.25%,and the average sound pressure level simulation error was 2.4 dB(A),which verifies the reliability of the simulation method.The frequency spectrum distribution characteristics of motor noise in the 1/3 octave band were analyzed,and the direction of noise reduction was pointed out.
关键词
风力发电机/自通风/直接冷却/气动噪声/仿真/1/3倍频程
Key words
wind turbine/self ventilated/direct cooling/aerodynamic noise/simulation/1/3 octave band
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