Measurements and Predictions of Endwall Heat Transfer in Two High Pressure Turbines

Accurate predictions of turbine heat transfer rates are needed to reduce the overall costs and risks of developing an efficient cooling system and to improve predictions of turbine life. 3D Navier Stokes codes are commonly used to predict the aerodynamic flowfield, but their use for heat transfer calculations is not so well established. This paper describes heat transfer predictions for the endwalls of two high pressure nozzle guide vanes using a typical Navier Stokes code and Baldwin Lomax turbulence model. The results are compared with experimental data and other published calculations and can be explained in terms of the endwall secondary flows.