离心式压缩机扩压器叶片不稳定脉动力分析及其辐射噪声研究

根据薄机翼理论，本文推导出在周期性阵风作用下扩压器环形叶棚叶片上不稳定脉动力计算公式，并可分析离心压缩机几何及气动参数对不稳定力的影响，利用调制理论，建立了一个可用于预测离心压缩机叶轮尾迹与叶片扩压器相互作用而导致的辐射声功率，给出其谐波及宽噪声的计算公式，计算与试验结果吻合很好。

A Study of Unsteady Fluctuating Lift and Its Acoustic Radiation on Diffuser Vanes of Centrifugal Compressor

On the basis of thin-airfoil theory, in this paper the calculating method of unsteady fluctuating lift of an annular cascade under .periodic gusts has been given, and the effects of geometrical and aerodynamic parameters of the centrifugal compressor on unsteady fluctuation lift analyzed. Using the random pulse modulation theory, a general model for calculating harmonic and broadband noise of the centrifugal compressor, and theoretical investigation of the acoustic radiation of vaned diffuser are presented. The method presented by this paper can be used to predict the acoustic radiation power of vaned diffuser due to interaction with impeller viscous wake. The results of the calculation are in good agreement with those measured by the experiments.