半开式离心叶轮变工况间隙流动特征  

On Nature of Tip Clearance Flow in Unshroud Impeller of Centrifugal Compressor at Different Flow Rate

作　　者：刘正先[1] 陈丽英[2] 

机构地区：[1]天津大学机械工程学院力学系,天津300072 [2]天津大学化工学院,天津300072

出　　处：《工程热物理学报》2012年第3期415-418,共4页Journal of Engineering Thermophysics

基　　金：国家973计划项目(No.2012CB720100)

摘　　要：针对叶顶间隙对半开式离心压缩机叶轮内部流场和气动性能的影响,采用数值方法研究了不同工况下叶轮流道及间隙处的流场规律,对比分析了小流量、设计和大流量三个运行下况下叶顶马赫数分布、叶顶载荷与间隙泄漏量、间隙泄漏涡特征的变化,以及叶顶间隙随进口流量变化对叶轮气动性能的影响,得出间隙涡流在通道中下游与主流相互掺混是引起半开式叶轮能量损失的主要原因。The effect of tip clearance on aerodynamic performance in un-shroud centrifugal impeller and the flow field at different flow rate were investigated using the numerical simulation method.The distribution of Mach number,blade loading,leakage flow and clearance vortex trajectory at different flow rate was separately analyzed.The flow performance of impeller was found to be changed with increasing the clearance value.The mixing between clearance vortex and main flow in downstream of flow channel is confirmed to be the major source of flow loss.

关 键 词：半开式离心叶轮 变工况 间隙涡流 数值模拟 

分 类 号：TH452[机械工程—机械制造及自动化]