不同翼刀位置控制涡轮叶栅二次流的数值研究  

Numerical Simulation on Secondary Flow Control in Turbine Stator Cascade With Different Position of Endwall Fence

作　　者：李军[1] 苏明[1] 

机构地区：[1]动力机械与工程教育部重点实验室(上海交通大学),上海市闵行区200240

出　　处：《中国电机工程学报》2008年第8期82-87,共6页Proceedings of the CSEE

摘　　要：为明确翼刀改善涡轮静叶栅二次流的机理,采用数值模拟的方法研究了端壁加装翼刀静叶栅的三维流场。与常规叶栅二次流特性相比,翼刀的存在降低了端壁附面层内的横向压力梯度,减弱了低能流体向叶栅吸力面/壁角区的堆积;同时通过产生的反向翼刀涡限制了马蹄涡的压力面分支的发展,从而达到减小通道涡的尺寸和强度的目的。通过距离压力面位置远近不同的3个翼刀方案的比较,发现距压力面愈近的翼刀方案控制二次流的效果较好。To illustrate the effect of endwall fence on turbine pneumatic characteristic, computational fluid dynamics were used to analyze the three-dimensional flowfield of turbine stators with endwall fence. The principle of endwall fence to control secondary flow is that the flow in suction surface/endwall comer is weakened and the fence reduces the pressure gradations in the boundary layer of stator cross section. At the same time, the passage vortex is also weakened for the pressure branch of horseshoe vortex is restricted by reverse fence vortex. By comparison with different distances between endwall fence and stator pressure surface, it is found that the control effect on horseshoe vortex is optimal at shortest distance.

关 键 词：二次流 涡轮 端壁翼刀 静叶栅 数值模拟 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]