Measurements and Computations of External Heat Transfer and Film Cooking inTurbines

摘要

A review of recent work on turbine heat transfer performed at the RAE (Pyestock)is presented. The work covers the effects of secondary flows on turbine nozzle guide vane heat transfer with and without film cooling. It is shown that the heat load to the platforms (end walls) are significantly affected by the secondary flow action. The platform film cooling data has been well correlated with flat plate single row film cooling data to within +11 percent. A three-dimensional Navier-Stokes computational study of the effects of turbine inlet temperature distortion on the thermo-fluid mechanics within a rotating blade passage is given. It is shown that the temperature distortion is modified within the rotor blade and can lead to increased pressure side and over tip heat transfer.