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首先利用SST k-ω湍流模型验证设计叶片在额定运行工况下的气动性能。然后运用大涡模拟(LES)和Lighthill声类比相结合的方法,模拟额定工况下叶片径向5个截面的气动涡流噪声,并确定声源分布,分析声传播特性,进而提出降低风力机气动噪声的措施。研究表明叶片尾缘是其主要声源部位;传播过程中近场受尾流影响明显,而远场基本不受影响;相对风速对于噪声的影响远大于攻角影响。
First, the aerodynamic performance of the designed blade under rated operating conditions is verified by the SST k-ω turbulence model. Then, a combination of large eddy simulation (LES) and Lighthill acoustic analogy is used to simulate the aerodynamic vortices noise in five radial sections of the blade under rated conditions and determine the sound source distribution, analyze the acoustic propagation characteristics, and then propose to reduce the aerodynamic Noise measure. The study shows that the trailing edge of leaves is the main source of sound field. The near-field is obviously affected by wake in the propagation process while the far field is not affected basically. The effect of relative wind speed on noise is much greater than that of the angle of attack.