超声速低反力度吸附式压气机变工况特性

为探讨非设计点的气动性能,以某3级高负荷低反力度吸附式压气机首级超声速级作为研究对象,借助数值模拟的方法,分别研究了变转速、变抽吸量以及近失速点首级超声速级参数以及内部流场的变化.结果表明:变转速条件下,基于低反力度设计概念研制的吸附式压气机所采用的抽吸方案仍能适应设计要求;减少抽吸量,在降低本级气动性能的同时,增加了其与下一级流动匹配的难度;通过在端壁抽吸槽道前段添加附加抽吸槽道/孔可进一步拓宽吸附式压气机的工作范围.

Characteristics under variant working conditions of a supersonic low-reaction aspirated compressor

In order to explore the aerodynamic performance at off-design points, taking an supersonic first stage of three-stage highly-loaded low-reaction aspirated compressor as research objection, the variation of parameters and inner flow filed for an supersonic first stage operating at various speeds, aspiration mass flow rates, and near stall point were investigated by numerical simulations. As a result, the aspiration schemes of the aspirated compressor designed with the low-reaction concept can still meet the design demands at various speeds; the reduction of aspiration mass flow rate will not only decrease the stage aerodynamic performance, but also affect the matching with the next stage; the working range of aspirated compressor can be further broadened by adding additional aspirated slot/holes before the endwall aspiration slot.