进口旋流条件下径流涡轮性能异化机制研究  

Study on Performance Deviation of Radial Turbine Under Inlet Swirl Condition

作　　者：周识略 倪庆明 杨名洋[1] 邓康耀[1] 丁占铭 Shi-lue Zhou;Qing-ming Ni;Ming-yang Yang;Kang-yao Deng;Zhan-ming Ding(Shanghai Jiao Tong University;China North Engine Research Institute)

机构地区：[1]上海交通大学 [2]北方发动机研究所

出　　处：《风机技术》2023年第3期8-13,共6页Chinese Journal of Turbomachinery

基　　金：中国北方发动机研究所稳定支持经费项目(52076130)。

摘　　要：可调两级增压系统中的低压级涡轮受高压级涡轮及上游管道的影响,其进口流场存在较强的旋流,进而该涡轮性能较均匀直流进气条件时呈显著异化现象。针对该问题,本文基于旋流发生器手段,开展进口旋流条件对径流涡轮性能影响的机制研究。结果表明,旋流改变了涡轮进口处的流场分布形态,并在蜗壳通道内产生周向畸变,从而改变周向上各叶轮进口的气流分布,造成蜗壳和叶轮内的显著流动损失异化。随着旋流强度的增大,涡轮效率的下降幅度越大,最大下降约4.1%。该研究探明了不同进口旋流条件下径流涡轮性能的异化机制,为两级可调增压系统高效涡轮设计提供了理论参考。The low-pressure stage turbine in the adjustable two-stage turbocharging system is affected by the high-pressure stage turbine and the upstream pipeline,and its inlet flow field has a strong swirl flow,which leads to a significant alienation phenomenon on the performance of the turbine comparing with uniform and direct current intake condition.In order to solve this problem,this paper studies the influence mechanism of inlet swirl conditions on the performance of radial turbine based on swirl generator.The results show that the swirl flow changes the flow field distribution at the inlet of the turbine,and produces circumferential distortion in the volute channel,thus changing the air distribution at the inlet of each impeller in the circumferential direction,resulting in significant flow loss alienation in the volute and impeller.With the increase of swirl intensity,the greater the decrease of turbine efficiency is,the maximum decrease is about 4.1%.This study explores the alienation mechanism of radial turbine performance under different inlet swirl conditions,and provides a theoretical reference for the design of high efficiency turbine of two-stage adjustable turbocharging system.

关 键 词：两级可调增压 进口旋流 径流涡轮 性能异化 

分 类 号：TH453[机械工程—机械制造及自动化]