设计了高负荷的双级离心压气机回流器,采用数值模拟的方法,分析了回流器内部主要流动结构,及其流动机理.基于对流动机理的认识,进一步对比分析了进口流场,叶片数,负荷分布形式对回流器流动结构和性能的影响.结果表明,改善进口流场、增加叶片数能够抑制回流器内部的二次流,增加回流器出口流场均匀性;负荷分布形式对回流器流动结构和性能影响较大,前加载的负荷分布形式能够得到更好的性能. Based on the understanding of the flow mechanism, the inlet flow field, the number of blades , The influence of the load distribution on the flow structure and performance of the return flow was studied.The results show that improving the inlet flow field and increasing the number of blades can restrain the secondary flow inside the return flow and increase the uniformity of the flow field at the outlet of the reflux flow. Flow structure and performance of larger impact, load distribution before loading form can get better performance.