非均衡进气对双面离心叶轮流动损失影响研究  

Influence Study of Un-Equilibrium Inlet Condition to Flow Loss Characteristic of a Double-Sided Centrifugal Impeller

作　　者：杨策[1] 荆磊[1] 陈山[1] 赵奔[1] 马朝臣[1] 

机构地区：[1]北京理工大学机械与车辆学院叶轮机械研究所,北京100081

出　　处：《工程热物理学报》2016年第2期264-267,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51376024);教育部博士学科点专项基金项目(No.20111101130002);国防重点实验室基金(No.9140C330102130C33001)

摘　　要：鉴于双面叶轮在内燃机增压领域有广阔应用前景,且叶轮两侧常为非均衡进气,因此有必要深入了解非均衡进气对双面叶轮性能及流动特性的影响,为今后设计更高性能双面叶轮提供指导。本文采用数值方法对非均衡进口条件下双面离心叶轮的流动特性进行研究,探讨了进口条件存在差异情况下对扩压器损失分布的影响。结果表明,双面叶轮性能,尤其小流量工况的性能受两侧进口条件差异影响明显,且随进口条件差异增大性能恶化更多以及稳定工作范围减小;在大流量工况,扩压器内的主要损失为两侧叶轮排气掺混损失;在小流量工况,扩压器内壁面分离涡团造成的损失较之两侧叶轮排气掺混损失更显著。The double-sided centrifugal impeller is a promising configure in internal engine turbocharging area.In this application,the double-sided impeller is suffered un-equilibrium inlet condition.It is necessary to understand un-equilibrium inlet condition influence on the double-sided impeller performance.Numerical simulation was employed to predict the diffuser flow loss.The results show that,the double-sided impeller performance,especially in near stall operation condition,is greatly affected by the inlet condition difference.With the inlet condition difference increase,both the impeller performance and stall margin decrease.Moreover,the main flow loss in diffuser is the exhaust mixing loss of double sided impeller under the large mass flow condition;On the small mass flow condition,the wall separating vortex loss is more obvious than the exhaust mixing loss in the diffuser.

关 键 词：双面叶轮 非均衡进口 共享扩压器 流动损失 

分 类 号：TK421.8[动力工程及工程热物理—动力机械及工程]