Heat Transfer in Film-Cooled Turbine Blades

Abstract

In order to study the effect of film cooling on the flow and heat transfer characteristics of actual turbine blades, a three-dimensional Navier-Stokes code has been developed. An existing code (Chima and Yokota, 1990) has been modified for the purpose. The code is an explicit finite difference code with an algebraic turbulence model. The thin-layer Navier-Stokes equations are solved using a general body-fitted coordinate system. The effects of film cooling have been incorporated into the code in the form of appropriate boundary conditions at the hole locations on the blade surface. Each hole exit is represented by several control volumes, thus providing an ability to study the effect of hole shape on the film-cooling characteristics. Comparison with experimental data is fair. Further validation of the code is required, however, and in this respect, there is an urgent need for detailed experimental data on actual turbine blades.

Experimental study of rotation effect on film cooling over the flat wall with a single hole

“…Garg and Gaugler [13][14][15][16][17] compared their predictions to experimental results obtained on the C3X vane, the VKI rotor blade and the ACE rotor blade. It should be noted that neither of the blades was rotating.…”

Comparison of Two-Equation Turbulence Models for Prediction of Heat Transfer on Film-Cooled Turbine Blades

“…An excellent survey of the work up to 1971 has been provided by Goldstein [4]. Several further studies in this field have been summarized by Garg and Gaugler [5][6][7]. This summary indicates that there is still a considerable experimental effort devoted to flat plate studies with somewhat unrealistic parameters such as the length-to-diameter ratio and the density ratio.…”

Application of the TLVA model for predicting film cooling under rotating frames

“…Readers interested may refer to the comprehensive reviews given by Goldstein [1] and Garg and Gaugler [2][3][4]. Because the corresponding experimental work costs highly and is pretty time-consuming too, especially for those requiring rotating heat transfer test rigs, numerical analysis has been paid more and more attention, and so the searching for a better and more accurate turbulence models becomes crucial.…”