Effusion cooling plates for combustor liners: experimental and numerical investigations on the effect of density ratio

Eusion cooling represents the state-of-the-art of liner cooling technology for modern combustors. The present paper describes experimental tests aiming at evaluating the cooling performance of a multi-perforated plate in real engine representative fluiddynamic conditions. Adiabatic eectiveness maps were obtained following the mass transfer analogy by the use of Pressure Sensitive Paint. In addition, a CFD campaign was performed in order to benchmark the reliability in estimating the cooling performance of eusion cooling liners. In order to include anisotropic diusion eects, the k omega SST turbulence model was corrected considering a tensorial definition of the eddy viscosity with an algebraic correction to dope its stream-span components.