Flow visualizations on wall surface and numerical simulations within turbine cascade with large tip clearance were carried out.Based on the experiential results and with the aid of numerical simulations

detailed flow structures within a typical turbine cascade were discussed.The detailed information of the flow fields near the wall surface

in the tip clearance

and especially

around the trailing edge was shown in the present study.In the up-half-span region

the flow became very complex due to the existence of the tip clearance.There are interactions among those vortices such as leakage vortex

up passage vortex

shed vortices on the pressure and suction sides

and trailing edge vortices.In the low-half-span

the flow fields near the region formed by the trailing edge and the endwall were also very complex.There are 3 saddle points company with 6 separation lines and 2 nodal points represent the trailing edge vortices on the wall surface near those region.At the end of this paper

vortical structures of the turbine cascade were developed.