跨音轴流压气机动叶的三维弯掠设计研究

对一单级跨音轴流压气机中的动叶分别进行了前掠和正弯设计的参数研究,并根据研究得到的弯、掠动叶气动性能变化规律对动叶进行了前掠和正弯联合的三维设计,同时对动叶中部截面的叶型进行了二维设计以弥补弯掠动叶中部性能的降低.最终设计的跨音级性能显著提高,级最大效率提高3%,失速裕度提高40%,同时压比有所增加.数值计算结果表明,前掠和正弯叶片都可以使叶顶激波位置移向下游,降低激波强度,减轻叶顶激波与边界层和泄漏涡的作用.弯掠动叶控制激波强度和端壁流动的能力更加突出.

Research on Design of Swept and Bowed Rotor in a Transonic Axial Flow Compressor

Firstly,the design parameters of forward sweep and positive bow were carried out separately for a transonic axial flow compressor rotor.The rotor's 3-D design was done by combining forward sweep and positive bow together based on the above research results of bowed and swept rotor's aerodynamic performance. At the same time,the 2-D design at the mid-span of the rotor profiles was done to offset the rotor's performance degradation caused by the application of sweep and bow.The performance of the transonic stage by final design enhanced remarkably.The highest stage efficiency increases by 3%,as well as the stall margin by 40%.Meanwhile the total pressure ratio increases a little higher.Numerical calculation results show that both the forward swept and positive bowed rotors can make the shock at the tip move to downstream and shock strength reduce.The interaction of shock with boundary layer and leakage vortex in the tip region are alleviated.The ability of controlling the shock intensity and improving endwall flow condition by the swept and bowed rotor shows more remarkable.