Interaction Between Wake and Film Cooling Jets: Numerical Analysis

The present work presents the results obtained from the numerical investigation of the 3D unsteady flow field in a film-cooled turbine vane. The blade under research is the AGTB-B1 investigated in the cascade of the High Speed Cascade Wind Tunnel of the University of Armed Forces Munich. The unsteady flow consists of a wake which periodically interacts with the shower-head film cooling system of the blade nose. The paper discusses the aerodynamical interaction between the film-cooled blade and the periodic wake produced by a moving row of bars placed in a plane upstream the cascade. The predictive approach is based on a U-RANS CFD solver using a conventional two-equation closure. The unsteady CFD results are discussed against the experimental data available. Special emphasis is devoted to the unsteady interaction of the wake with the shower-head film-cooling system of the blade.