Correlation of Numerical and Experimental Heat Transfer Data at the Turbine Blade Surface

Abstract

Transitional two-dimensional boundary-layer flows are considered. The alge-braic eddy-viscosity model for a simulation of nonturbulent(laminar)boundary layers is proposed. It takes into account, in a simple form, an intensity and a length scale of the free stream turbulence(FST)and a value of the favorable pressure gradient. Transition is modeled by employing the intermittency factor. The Baldwin-Lomax model is used to calculate turbulent portions of the boundary layers. The boundary layer(BL)and heat transfer measurements for flows over a flat plate were employed to verify the proposed "nonturbulence" model and for an evaluation of the numerical code abilities to predict heat transfer for transitional flows. The code was applied for the calculation of heat transfer coefficients of two different gas turbine vanes, and the results were compared with available experimental data at different free-stream turbulence and Reynolds number conditions.