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 analy sed under engine conditions. The time-dependent, two-dimensional, mass-aver aged, Navier-Stokes (N-S) equations are solved in the physical plane based on the four-stage Runge-Kutta algorithm in the finite volume formulation. L ocal time stepping, variable coefficient implicit residual smoothing and a full multigrid technique have been implemented to accelerate the steady sta te calculations. Turbulence was simulated by the algebraic Baldwin-Lomax (B -L) model. The computed heat transfer distributions with film cooling in co njunction with internal cooling were in good agreement with the experimenta l data. The present computation was successful in describing the coolant be haviour over the curved suction and pressure surfaces of a turbine blade fo r varying blowing and temperature ratios.