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均匀流场中螺旋桨线谱噪声的频域预报方法

Keywords: 声学, 螺旋桨, 线谱噪声, 均匀流场, 表面积分??

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Abstract:

为研究均匀流场中的螺旋桨远场辐射线谱噪声,在Lighthill声类比理论和 Ffowcs William??Hawkings方程的基础上,应用带有平均流效果的格林函数,建立了螺旋桨线谱噪声的频域预报理论,突破了现有理论需要假设薄机翼和必须在投影平面对声源进行积分的界限,允许在螺旋桨真实叶表面对声源进行积分.数值计算及与实验结果的比较表明,该频域方法是有效的,并且具有相当高的预报精度.对线谱噪声指向性分析表明,最大值与螺旋桨轴垂直,并且随频率增加主瓣宽度相应减小.

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