关键词: 通道涡, 弯叶片, 流动显示, 实验研究, 数值模拟

Abstract: To discuss the effects of several different geometric and aerodynamic parameters on the forming and developing of passage vortex in a turbine guide vane passage with a great meridional diffused casing section, especially the effects of the curved blade on the position and intensity of passage vortex, experimental investigation and numerical simulation are applied to the original and modified turbine low pressure guide vanes of a certain turbofan engine. Results show that because of inlet separation and great thick inlet boundary layer caused by the meridional diffused casing, the curved blade has inverse effect on the position of passage vortex as compared to other inlet condition, and the positive curved blade causes the upper passage vortex to rise, the essential reason of this phenomena is the common action of inlet separation, great thick inlet boundary layer and positive curved blade.

Key words: passage vortex, positive curved blade, flow visualization, experimental investigation, numerical simulation