脉冲涡轮可调喷嘴尾迹及间隙泄漏流  

Variable Nozzle Wake and Clearance Leakage of Pulse Turbocharging Turbine

作　　者：张锐[1] 施新[1] 杨策[1] 马朝臣[1] 祁明旭[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《内燃机学报》2013年第5期455-460,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(51276018)

摘　　要：通过数值模拟的方法研究了脉冲进气条件下可变喷嘴涡轮喷嘴尾迹传播规律和喷嘴间隙泄漏流的影响.结果表明:低脉冲压力时喷嘴尾迹摆动剧烈,喷嘴转子叶片间的势流干涉作用强烈;高脉冲压力时转子叶片受到两道喷嘴尾迹影响,作用深度达到50%弦长;不同涡轮进口脉冲压力对应的喷嘴间隙的泄漏形态不一样,并且轮缘侧和轮毂侧的泄漏流形态也存在不一致,从而对喷嘴出口气流角和转子进口攻角都造成了不同影响;当涡轮进口压力较低时,脉冲压力变化对喷嘴出口气流角影响大,而当进口压力较高时,转子进口主流沿叶高方向的攻角趋向一致.The wake and clearance flow of pulse turbocharging turbine variable nozzle were studied with CFD. Results show that, at low pulse pressure, the nozzle wake shakes severely and the effect of potential flow between the blades of nozzle-rotor is increased. At high pulse pressure, half of the rotor blade chord is influenced by the two nozzle wakes. Patterns of nozzle clearance leakage flow vary at different turbine inlet pressures, and the patterns at the shroud side and hub side are varied. Nozzle outlet flow an- gle and rotor inlet attacking angle are influenced by the nozzle clearance leakage flow. Nozzle outlet flow angle is sensitive to the variation of pulse pressure at low turbine stage inlet pressure. Rotor attacking angle becomes identical in the spanwise direction at high inlet pressure.

关 键 词：可变喷嘴涡轮 脉冲进气 尾迹 泄漏流 非定常 

分 类 号：TK474[动力工程及工程热物理—动力机械及工程]