轴向式可变截面涡轮增压器喷嘴调节机理分析  

Mechanism of Nozzle Ring Vane Adjustment of Axial VGT

作　　者：卢隆辉 吴龙[1,2,3] 刘建军[1,2,3] 

机构地区：[1]三明学院机电工程学院,福建三明365004 [2]机械现代设计制造技术福建省高校工程研究中心,福建三明365004 [3]绿色铸锻及高端零部件制造协同创新中心,福建三明365004

出　　处：《三明学院学报》2016年第2期74-81,共8页Journal of Sanming University

基　　金：三明学院科研基金项目(B201404/Q);福建省中青年教师教育科研项目(JA15479)

摘　　要：对不同工况情况下的涡轮端的流场数值分析,得出以下结果:当低工况时,气体流经低速叶片流道,膨胀比大,压力能和热能转换成动能明显,入口攻角气体合适,流动情况好,涡轮效率高;当高工况时,气体流经高速叶片,膨胀比小,压力能和热能转换动能平缓,入口攻角较大,出现气体分离现象,涡轮效率低。Numerical simulation of the flow field in turbine end in different working conditions is analyzed. The results show that： the gas flow through the low-speed nozzle course at low load, which has the high expansion ratio. The pressure energy and heat energy transform obviously into kinetic energy. The gas has proper inlet angle of attack, and the internal flow of the turbine is well, so that turbine efficiency is high; the gas flow through the high-speed nozzle course at high load, which has the low expansion ratio. The pressure energy and heat energy transform relatively slowly into kinetic energy. The inlet angle of attack is relatively big, and the phenomenon of the gas separation occurs, so that turbine efficiency is low.

关 键 词：轴向调节式 喷嘴叶片 流场 数值分析 

分 类 号：TK421.8[动力工程及工程热物理—动力机械及工程]