【摘要】 采用三维粘性程序对某型动力涡轮的第一级进行了数值模拟,模拟结果捕捉到了该涡轮级叶栅的内部流的流动细节,展示了涡轮叶栅端壁和型面流动及叶栅通道内的三维流动结构.通过对叶栅中的二次流现象和流动损失机理的分析,揭示了该涡轮级叶栅通道内二次流旋涡结构(马蹄涡、通道涡、壁角涡、尾迹涡、泄漏涡等)的演变过程,以及旋涡结构对损失分布的影响.更多还原

【Abstract】 Numerical simulation about the first stage of a power turbine was performed using 3D viscous code,showing that the details in this turbine stage were captured.And,the flow characteristics of endwalls and blade surfaces for these cascades and the structures of 3D flow field were also presented.After analysis of secondary flow phenomenon and loss mechanism,the evolution process of secondary flow vortex structures in cascade passage(horseshoe vortex,passage vortex,corner vortex,trailing vortex,tip leakage vortex,etc) were revealed,and the effects of vortex structures on loss distribution were also studied.更多还原