Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Due to machining techniques and dust deposition, gas turbine upstream slots vane roots are always filleted, significantly affecting the cooling performance of endwall. The effects slot fillet root on endwall were investigated by solving three-dimensional Reynolds-averaged Navier–Stokes (RANS) equations with shear stress transport (SST) k–ω turbulence model. results indicate that velocity distribution coolant is effectively changed introducing fillets. Among four cases, largest adiabatic effectiveness was obtained for case two similar fillets, a 42% increase in effective area compared traditional slot. At MFR = 0.75%, horseshoe vortex weakened introduction small radius, 53% baseline. However, large radius makes boundary layer flow separately prematurely, decreasing performance. lateral coverage jet from filmhole embedded greatly enhanced increasing radius. streamwise decreased thermodynamic loss increased.