摘要
采用数值模拟计算的方法研究了90°弯管对离心压气机进口流场产生的畸变,并对比了两种弯管在不同轴向位置时其内部流场的区别,分析了弯管所致的进口畸变造成压气机性能下降的原因.结果表明,弯管畸变对离心压气机性能的恶化程度与弯管所在位置有关,距离叶轮进口较远的弯管影响较大.与无弯管相比,弯管造成叶轮进口的流场紊乱.畸变引起压气机性能在大流量时有明显降低,在小流量时恶化程度较小.这是因为流量增大时,进口畸变的作用增强,可以一直发展到蜗壳入口,并与舌部引起的周向畸变联合作用导致压气机性能下降.流量减小时,进口畸变的影响会减弱叶轮流道中的损失,有利于保持近失速状态下的压气机性能.
To understand the effects of centrifugal compressor inlet distortion caused by 90° bent pipe,two different axial position inlet bent pipes were numerically simulated with compressor and the influence on compressor performance was analyzed.The results show different performance deterioration between different bent pipes,the larger distance between bent pipe outlet and impeller inlet leads to more decrease.The bent pipe makes the flow field of impeller inlet strongly disorderly.The distortion causes a noticeable decline in compressor performance under large mass flow rate and a slight drop at low mass flow rate.The effect of inlet distortion amplifies and develops to the volute inlet while the mass flow rate increases,which functions together with circumferential distortion caused by volute tongue,resulting in decrease of the performance.When the mass flow rate is low,the inlet distortion reduces the flow loss in impeller passage,helping to maintain the performance of compressor at low mass flow rate.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2010年第11期2556-2563,共8页
Journal of Aerospace Power
关键词
进口畸变
弯管
离心压气机
数值模拟
流场结构
inlet distortion； bent pipe； centrifugal compressor； numerical simulation； flow field structure；
