间隙非谐对离心压气机离散噪声的影响

以主叶片及分流叶片叶顶间隙相同的离心压气机为原型,采用数值方法,对比分析了增大主叶片叶顶间隙同时减小分流叶片叶顶间隙,以及减小主叶片叶顶间隙的同时增加分流叶片叶顶间隙这两种间隙非谐方案对于离心压气机性能的影响.在此基础上,基于离心压气机内部非定常流动参数,结合FW-H方程进行了离心压气机内部离散噪声分析,研究了间隙非谐对离心压气机离散噪声的影响.结果表明,适当减小主叶片叶顶间隙,增大分流叶片叶顶间隙,可以在保持压气机性能的基础上有效降低压气机离散气动噪声. 

Influences of Dis-Tuned Tip Clearance on the Discrete Aerodynamic Noise in Centrifugal Compressor

Based on the compressor model with same main blade and splitter blade tip clearance, the influence of dis-tuned tip clearances of main blade and splitter blade on the compressor performances was numerically studied. With the dis-tuned tip clearance models, the FW-H equations were solved by using the unsteady flow results inside the compressor, and the influences of dis-tuned tip clearance on the compressor discrete aerodynamic noise were investigated. Results indicate that the dis-tuned tip clearance configuration with increased splitter tip clearance and decreased main blade tip clearance can decrease the discrete aerodynamic noise of centrifugal compressor effectively, while keeping its performance nearly unchanged.