Numerical study of rotor tip ejecting
-
摘要: 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.
-
关键词:
- 叶尖泄露涡
Abstract: The stall margin of compressor can be effectivelyimproved by rotor tip injection, but the available injectors are complex instructure and will increase the engine weight. The purpose of this paper isto explore a new type of injection, which is easy to implement incompressors without increasing the total weight. A casing modification (CM)method was used on the casing near the rotor tip leading edge, so that theaxial velocity near rotor tip leading edge improved, which has a similareffect on the rotor tip injection. The method was numerically tested on therotor 37, and it was concluded that, the CM method could improve the rotorstall margin by 6.7%, and the efficiency and pressure ratio are improvedslightly. Comparison of different schemes of CM method shows that, thelocation of CM influences stall margin most obviously. The analysis of rotortip flow field indicates that, the CM method could increase the rotor tipaxial velocity, push the tip leakage vortex downstream, weaken the blockageat the rotor tip region, and enhance stability of the rotor therefore.-
Key words:
- Tip leakage vortex
-
点击查看大图
计量
- 文章访问数: 1684
- HTML全文浏览量: 33
- PDF下载量: 503
- 被引次数: 0
下载:
