Calculation of Heat Transfer to Turbine Blading Using Two-Dimensional Boundary Layer Methods

The calculation of the external boundary layer and associated heat transfer to turbine blading is described. Three separate Two-Dimensional Boundary Layer programs were utilised in this study. The programs incorporated the k-epsilon turbulence model with several different formulations. The test case chosen for this study was the von Karman Institute blade VKI Tech. Note-174, Sept-1990.It is shown that in most cases all programs tend to predict the correct behaviour of the onset of transition. However, the transition length between the laminar and turbulent values is predicted too abruptly on the blade suction side. It was found that the magnitude of the predicted heat transfer coefficient was most consistent with experimental values for exit Mach numbers between 0.7–0.9, and for all inlet turbulence levels and Reynolds numbers. For higher blade exit Mach numbers in the transonic region (M > 0.95) it was difficult to correctly predict the heat transfer in comparison with experimental data. The predicted values were all higher than the measurement. For this blade, the pressure side is quite well predicted for most of the operating conditions.Copyright © 1993 by ASME