湿压缩对压气机转子失稳边界工况性能的影响

Influence of wet compression on performance of compressor rotor working at its stall boundary

针对某型跨声速压气机转子的失速边界工况,采用数值模拟方法系统研究了不同加湿条件对其性能的影响。获得了水滴粒径、速度、温度和喷水量与转子进气流量、压比、效率、比压缩功等性能参数之间的关系曲线。结果表明:在失速边界上对跨声速压气机进气加湿,可以增加空气流量,提高总压比和效率,降低比压缩功。通过对流场的分析,发现进气加湿后,向低能区注入了高动量的水滴颗粒,削弱叶顶阻塞团,将主流与泄漏流交界面和激波位置向下游推进,减小激波强度,降低叶顶载荷,增大主流区载荷,改善了叶顶流场。提出了以水滴的面积流量定量评价不同进气加湿条件对叶顶流场的作用效果。

At the stall boundary condition of a transonic compressor rotor,numerical simulation method was used to study the effects on operation performance with different inlet fogging conditions.Correlation curves between performance parameters,including air flow,total pressure ratio,isentropic efficiency and specific work,and inlet fogging parameters,including water droplet diameter,velocity,temperature and water spray rate,were obtained.Results showed that inlet fogging can increase air flow,heighten total pressure ratio,enhance isentropic efficiency and reduce specific work.Through analyzing the flow field in detail,it was found that inlet fogging can inject high momentum water droplet to tip stagnation zone,decrease blockage region,move down the interface between main flow and leakage flow,weaken the strength of shock,reduce tip load and increase load at mainstream region.A parameter named water droplet area flow was taken to evaluate the effect on flow fieldwith different fogging conditions quantitatively.