非均匀桨结合后掠桨尖的旋翼厚度噪声研究Research on Thickness Noise of Helicopter Rotor with Uneven Blade Spacing and Swept Tip
李东红,黄庆彩,杨亦春
摘要(Abstract)：
针对普通直升机存在噪声大的问题,分析了一种将桨叶间距非均匀与桨尖后掠二者相结合的旋翼的厚度噪声。通过FW-H方程的Formulation 1A公式计算了该旋翼在不同桨叶间距和桨尖后掠角情况下的厚度噪声。计算结果表明,在桨盘平面内距离桨毂中心3 m处,桨尖后掠角度为80°时的厚度噪声约比无后掠的普通旋翼的厚度噪声降低3 dB,采用将非均匀桨与桨尖后掠二者相结合的旋翼可以在降低厚度噪声的同时明显减小特征线谱的幅值,此外还可明显改变旋翼在桨盘平面内的指向性。
关键词(KeyWords)： 旋翼;厚度噪声;非均匀桨;后掠桨尖
基金项目(Foundation):
作者(Author): 李东红,黄庆彩,杨亦春
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