高负荷跨音压气机转子的间隙效应

利用高频响动态压力传感器对一个具有2.2级压比的跨音压气机级(ATS-2)进行了转子叶尖间隙流场测试研究,获得了多个转速不同节流状态下的转子叶尖内壁面静压场.结果表明,100%转速时,除前缘贴体斜激波外,叶片通道内存在一道二次正激波,并在吸力面附近出现了一道较短的正激波.该波系随出口节流加深而向上游移动,并最终归并为前缘正激波,此时,级性能达到峰值效率.另外,比较了不同叶尖间隙机匣的总性能,结果表明,机匣结构和间隙的变化严重影响压气机级性能参数.

Experimental Investigation on High-Loading Transonic Compressor Rotor

Unsteady pressure transducers with high frequency response were used to investigate tip clearance flows in a transonic compressor rotor (ATS-2), which is a high-loading compressor with 2.2 designed pressure ratio. Static pressure contours were obtained for different operating conditions at several different speeds. It was followed that, not only an attached oblique shock emanating from the leading edge and a secondary normal shock exist in the passage at 100% speed, but also a short-range normal shock appears near the suction surface. With closing the outlet throttle, the shock waves move forward and finally merge into normal shock near the leading edge, meanwhile, the stage performance reaches the peak efficiency. The overall performances of ATS-2 with two different tip clearance casings were compared. It reveals that the change of casing structure and tip clearance seriously influence the performance of the compressor.