离心压缩机主要部件是叶轮，叶轮设计不仅影响叶轮效率，而且叶轮出口流场会影响到下游扩压器的性能，放大对整级性能的影响。本文对某储能用离心空气压缩机的首级进行气动优化分析，压缩机叶轮为三元闭式离心叶轮，扩压器为翼型有叶扩压器。使用NREC Axcent软件造型，结合CFD软件对离心叶轮进行优化。叶轮优化参数包括叶片只数，子午流道，后弯角，叶片扩张角等参数，本次通过叶轮的优化，总结了叶轮各个造型参数的影响。通过自动优化方法，对比分析了直线元素三元叶轮、曲线元素三元叶轮的气动性能，结果显示曲面元素叶轮二次流不明显，流动损失小, 曲线元素叶轮低速流团分布区域小于直线元素。最后对有叶扩压器与叶轮出口气流进行匹配，研究发现扩压器入口攻角在-5~5°为佳。

The main component of the centrifugal compressor is the impeller, the impeller design not only affects the impeller efficiency, but also affects the performance of the downstream diffuser and amplifies the impact on the performance of the whole stage. In this paper, the first stage of a centrifugal air compressor for energy storage is analyzed, the compressor impeller is a 3D closed centrifugal impeller, and the diffuser is an airfoil-type leafed diffuser. Centrifugal impellers are optimized using NREC Axcent software modeling in conjunction with CFD software. Impeller optimization parameters include the number of blades, meridian runner, back bend angle, blade expansion angle and other parameters, this time through the optimization of impeller, the influence of various molding parameters of impeller is summarized. Through the automatic optimization method, the aerodynamic performance of the linear element impeller and the curve element impeller were compared and analyzed, and the results showed that the secondary flow of the curved element impeller was not obvious, the flow loss was small, and the low velocity flow group distribution area of the curved element impeller was smaller than that of the linear element. Finally, the leaf diffuser and the impeller outlet airflow were matched, and the study found that the angle of attack at the inlet of the diffuser was preferably -5 to 5°.