ON THE PREDICTION OF FILM COOLING WITH COMPOUND ANGLE INJECTION USING A 3D FEATURE-BASED JET MODEL

摘要

A 3D feature-based film cooling jet model is proposed for the numerical simulation of film cooling flows. The goal of the model is to provide the film-cooled turbine blade designer an accurate and computationally efficient numerical tool. The modeling is done in the near hole region only, so that it is entirely local. The model, already validated for streamwise injection cases (GT2005-68780 [6]), is modified so that compound angle β{sub}0 injection flows can be simulated. The modifications of the model concern the lateral trajectory of the jet and the structural change of the coolant counter-rotating vortex pair. These modifications are not calibrated because no experimental data is available to the authors yet in the near hole region. Meanwhile, it is shown that the modeling strategy is relevant and robust for compound angle injection. In addition, the model modifications allow accurately predicting the adiabatic film cooling effectiveness for moderate compound angle (β{sub}0 ≤ 30°). Necessary updates of the model to accurately compute high compound angle injection are discussed.