COMPUTING The COMBINED EFFECT OF WAKE-PASSING and FREE-STREAM TURBULENCE ON GAS TURBINE BLADE BOUNDARY LAYERS

Abstract

A boundary layer computational procedure has been developed which simultaneously accounts for the time-mean effect of wake-passing and free-stream turbulence on heat transfer to gas turbine blades. The principal advantages of this procedure over others is that it has greater generality and can account fully for both wake- and free-stream turbulence-type unsteadiness. In addition, the procedure is computationally efficient as it can be incorporated into standard two-dimensional steady flow boundary layer codes once the wake effects have been ascertained. The method has been demonstrated for the momentum and mass equations at the stagnation point of a gas turbine blade and some results are presented in this paper.