Abstract
This paper reports on numerical assessment of cooling performance of internal ribbed channels in a rotor blade installed in a power generation gas turbine. Roughness functions of heat and mass transfer for fully developed flow in a rectangular cooling channel with two opposite angle-ribbed walls were estimated by using Large-Eddy Simulation (LES). In order to predict temperature profile of the rotor blade, derived correlations of the roughness functions from the LES were applied to the conjugate heat transfer calculation of the blade. As a result, predicted temperature profile on the blade is in agreement with local temperature estimated from material of the spent blade and numerical results presented characteristic variations of the local temperature depending upon mass flow rate of the internal cooling air.
