V2F simulation on secondary flow and heat transfer of turbine cascade endwall

Numerical simulation using V2F model based on a linear eddy viscosity assumption, was carried out on subsonic flow and heat transfer of turbine cascade endwall with low aspect ratio airfoil. The results show that complex vortex structures in turbine cascade are mainly composed of horseshoe vortex, passage vortex, pressure side corner vortex and suction side corner vortex. The horseshoe vortex and passage vortex are main sources of secondary loss, and their intensity and location have direct effect on heat transfer of endwall, showing obvious partition property; prediction on endwall limiting streamlines shows that single horseshoe vortex separation line with V2F model is consistent with the experiment data, and superior to double horseshoe vortex separation line predicted by SST(shear stress transport) k-ω model. With introduction of a new turbulent scale, which coincides well with experiment data on endwall static pressure loss coefficient distribution, locations of horseshoe vortex and passage vortex and total pressure loss coefficient distribution of cascade outlet and endwall Standon number distribution, V2F model could predict better on both cascade aerodynamic loss and endwall heat transfer than SST k-ω model.