考虑了近叶片相互作用，首次推出了周期非定常来流作用下环列叶栅叶片上不稳定脉动力计算公式．利用此方法可确定在叶轮叶片粘性尾迹作用下扩压器叶片上所受的不稳定脉动力．由计算公式可计算出叶轮结构参数、气流参数、扩压器叶片几何参数、扩压器叶片气流攻角等对扩压器叶片上不稳定脉动力的影响，为设计低噪声离心压缩机、通风机提供理论依据． Considering the interaction of near-blade, the formula of unsteady pulse force on ring-cascade vane under unsteady flow is introduced for the first time. This method can be used to determine the unsteady pulsation force on the diffuser vanes under the viscous wake of the impeller blades. From the calculation formula, the influence of impeller structure parameters, airflow parameters, diffuser vane geometry parameters and diffuser vane flow angle on the unstable pulsating force on the diffuser vane can be calculated. For the design of low noise centrifugal compressor, ventilation Machine to provide a theoretical basis.