Film cooling on a turbine guide vane: a numerical analysis with a multigrid technique

The flow and heat transfer due to film cooling over a turbine nozzle guide vane, which was also cooled by internal convection, were. numerically analysed under engine conditions. The time-dependent, two-dimensional, mass-averaged, Navier-Stokes (N-S) equations are solved in the physical plane based on the four-stage Runge-Kutta algorithm in the finite volume formulation. Local time stepping, variable coefficient implicit residual smoothing and a full multigrid technique have been implemented to accelerate the steady state calculations. Turbulence was simulated by the algebraic Baldwin-Lomax (B-L) model. The computed heat transfer distributions with film cooling in conjunction with internal cooling were in good agreement with the experimental data. The present computation was successful in describing the coolant behaviour over the curved suction and pressure surfaces of a turbine blade for varying blowing and temperature ratios.