The stall margin of compressor can be effectively improved by rotor tip injection, but the available injectors are complex in structure and will increase the engine weight.The purpose of this paper is to explore a new type of injection, which is easy to implement in compressors without increasing the total weight.A casing modification (CM) method was used on the casing near the rotor tip leading edge, so that the axial velocity near rotor tip leading edge improved, which has a similar effect on the rotor tip injection.The method was numerically tested on the rotor 37, and it was concluded that, the CM method could improve the rotor stall margin by 6.7％, and the efficiency and pressure ratio are improved slightly.Comparison of different schemes of CM method shows that, the location of CM influences stall margin most obviously.The analysis of rotor tip flow field indicates that, the CM method could increase the rotor tip axial velocity, push the tip leakage vortex downstream, weaken the blockage at the rotor tip region, and enhance stability of the rotor therefore.%转子叶尖射流能够有效地提高压气机的稳定工作裕度,但是现有的各种射流器结构复杂,并使发动机的重量增加.研究目的在于探索一种新型的射流方式,以方便在压气机中的实现,并且不增加发动机的重量.采用对转子叶尖前缘位置机匣进行局部修型的方法,提高了转子叶尖前缘附近流场的轴向速度,从而产生类似转子叶尖射流的效果.在Rotor37上的数值分析发现,该方法能够提高转子的失速裕度约6.7%,并能使转子的效率与压比有较小的提升.对比不同机匣修型方案发现,修型位置对压气机裕度的影响最为明显.对转子叶尖流场的分析表明,该方法能够提高转子叶尖前缘的轴向速度,并将叶尖泄露涡向下游推移,减小了转子叶尖的流动堵塞,从而拓宽了转子的失速裕度.
展开▼
