子午收缩叶栅气动性能研究  

Research on Effects of Incidence to Guide Cascade Aerodynamic Performance

作　　者：徐赢[1] 

机构地区：[1]东北石油大学,大庆163318

出　　处：《价值工程》2012年第18期17-18,共2页Value Engineering

摘　　要：在透平叶栅中，二次流动的影响贯穿整个流场的大部分，且其损失占总损失的一半，因此通过端壁型线设计改善流动以提高涡轮效率是有效的方法之一。仿真结果表明；外端壁子午收缩设计形成沿叶高的均匀静压分布，抑制了边界层的径向二次流。子午收缩叶片在0-0．89相对叶高范围内的压力损失都小于直叶片栅，只是在顶端附近损失加大，总体来说子午收缩提高了叶栅的热效率。In the turbine cascade passage, secondary flow impacted most flow field and secondary flow loss shared half of the total loss. So the end wall profile design was one of effective methods to improve turbine efficiency. Simulation results shown that meridional shrinkage design of the end wall outer profile could form uniform static pressure distribution along the blade height, and restrained the radial secondary flow of the boundary layer. The pressure loss of meridional shrinkage blades was less than straight blades from 0 to 0.89 relative blade height, and more near the blade tip. Overall the meridiunal shrinkage blades improved its thermal efficiency.

关 键 词：导向叶栅 子午收缩 二次流 效率 

分 类 号：TK14[动力工程及工程热物理—热能工程]