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通过数值方法研究了由2级风扇、4级高压压气机及外涵组成的紧凑压缩系统的气动性能.探讨了双涵双轴压缩系统气动性能的评估方法及数值计算中相应的边界给定方法.通过对紧凑压缩系统的一体化数值模拟,分别获取了风扇及高压压气机的设计转速特性,并与设计值进行了对比,结果表明流量、压比、效率都达到了设计要求,而风扇失速裕度仅为7.8%,低于设计指标.对节流过程中流动分析表明,内涵节流时,压缩系统的失稳起始于高压压气机出口级;外涵节流时,风扇进口级叶尖泄露涡在通道激波作用下发生破裂,导致较大范围的堵塞,是压缩系统失稳的主要原因.
The aerodynamic performance of a compact compression system consisting of a 2-stage fan, a 4-stage high-pressure compressor and external components was studied numerically.The evaluation method of the aerodynamic performance of the double-culm biaxial compression system and the corresponding boundary-setting method in the numerical calculation were discussed Through the integrated numerical simulation of the compact compression system, the design rotational speed characteristics of the fan and the high pressure compressor are respectively obtained and compared with the design values. The results show that the flow rate, pressure ratio and efficiency meet the design requirements, while the fan stall The margin is only 7.8%, lower than the design index.Analysis of the flow during the throttling process shows that the throttling of the compression system starts at the outlet of the high-pressure compressor when the throttling of the content is reached, The tip leakage vortex ruptures under the channel shock wave, resulting in a large range of blockages, which is the main reason for the compression system instability.