不同翼刀高度控制涡轮静叶栅二次流的数值模拟  

Numerical Simulation on Secondary Flow Control in Turbine Stator Cascade with Different Fence Height

作　　者：李军[1] 苏明[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室

出　　处：《动力工程》2008年第4期523-527,578,共6页Power Engineering

摘　　要：对端壁加装翼刀的涡轮静叶栅的三维流场进行了数值模拟,分析了翼刀对叶栅沿流向各截面二次流及叶栅气动特性的影响,并研究了翼刀改善二次流的机理.结果表明:与常规叶栅的二次流特性比较,翼刀的存在一方面降低了端壁附面层内横向压力梯度,减弱了低能流体向吸力面/壁角区的堆积;另一方面产生反向翼刀涡,限制了马蹄涡压力面分支的发展,从而达到减小通道涡尺寸和强度的目的.最后,还对几个不同高度的翼刀方案进行了比较,发现翼刀高度为2/3δ时,对二次流的控制最佳.The three dimensional flow field of turbo stator＇s cascade with fence added on the end-wall was numerically simulated. The effect of end wall fence on turbine pneumatic characteristic and secondary flow of blade on cross sections along flow direction were analyzed. The mechanism of the secondary flow status improved by the fence was studied. Compared with the general cascade;s secondary flow, the transverse pressure gradient within the end-wall＇s boundary layer was reduced with the fence existing. On the other hand, the branch of horseshoe vortex on the pressure surface was restricted to be spread by reverse fence vortex generated by the fence. Thus the passage vortex range and its intensity would be reduced. By comparison with several schemes with different fence height, the control of the secondary flow reached the optimum with the fence height of 2/3 δ.

关 键 词：能源与动力工程 二次流 涡轮 端壁翼刀 静叶栅 数值模拟 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程] S685.23[农业科学—观赏园艺]