Experimental and numerical investigation on effects of turbine guide vane geometric and aerodynamic parameters on passage vortex

To discuss the effects of several 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. The 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 phenomenon is the common action of inlet separation, great thick inlet boundary layer and positive curved blade.