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首先通过商业流体软件FLUENT中的LES模型计算对称机翼周围的流场,再运用噪声分析软件ACTRAN提取流场信息,并用Lighthill声类比方法来模拟声场,将气动特性和声场与有关文献的实验结果作对比。接着固定雷诺数,按上述方法模拟非对称翼风力机机翼周围的声场,分析在不同攻角下机翼近场和远场声压分布特点和声传播规律。最后采用不同雷诺数,模拟攻角为9°时非对称机翼周围声场,结果表明雷诺数与声压级关系紧密,但雷诺数和声传播特性关联不大。
Firstly, the flow field around the symmetrical wing was calculated by the LES model of commercial fluid software FLUENT, and then the flow field information was extracted by the noise analysis software ACTRAN. The sound field was simulated by Lighthill acoustic analogy method. The aerodynamic characteristics and sound field were compared with the experimental results For comparison. Then the Reynolds number is fixed, and the sound field around the wings of the asymmetric wing wind turbine is simulated according to the above method. The sound pressure distribution characteristics and sound propagation rules of the wing near and far fields under different angles of attack are analyzed. Finally, different Reynolds numbers are used to simulate the sound field around the asymmetrical wing when the angle of attack is 9 °. The results show that the Reynolds number is closely related to the sound pressure level, but the correlation between the Reynolds number and sound propagation is not significant.