叶型曲率分布对风扇/压气机激波噪声的影响机理研究

Effect of Blade Curvature Distribution on Buzz-Saw Noise

数值研究了压气机转子叶型曲率分布对激波噪声的影响,分析了叶型曲率分布对前伸激波强度及其与膨胀波的相互作用的规律,提出通过优化叶片前缘至极限特征线之间的叶型曲率分布,以降低前伸激波初始强度,并增强膨胀波与前伸激波的相互作用,使前伸激波在前传过程中进一步衰减,从而达到从声源及传播途径两个方面对激波噪声进行有效控制的目的。结果表明,本文提出的改型方法能够在保证叶型厚度基本不变的同时有效降低激波噪声。

The effect of the fan/compressor blade’s curvature distribution on the buzz-saw noise was studied numerically. The effect of curvature distribution on the detached shock wave’s strength and interaction with the expansion wave was analyzed. Results show that optimizing the blade’s curvature distribution between the blade leading edge and the limiting Mach line can not only reduce the initial shock wave intensity, but also make the shock wave decay during propagation by strengthening its interaction with the expansion waves. This optimization method can effectively control the buzz-saw noise from two aspects, both at the source and during the propagation. The optimized blade proposed in this paper can significantly reduce the buzz-saw noise with little variation in blade thickness.