Effect of Film Cooling on Entropy Noise Generation in a Stator Blade Row

Modeling of indirect combustion noise through a stator

“…The confidence in these simulated transfer function is comforted by the very good agreement with the numerical results of Bach et al, who evaluated the thermoacoustic transfer functions of the same stator blade with similar operating conditions [32].…”

“…Recent numerical simulations indicate hypotheses (i), (ii) and (iii) sound reasonable: viscous effects are limited to the boundary layers which are expected to be thin and without significant impact in the stator [29][30][31]; thermal protection of the turbine blades by film cooling makes the adiabatic assumption invalid in practice, but its impact on stator transfer functions is very limited [32]; temperature-dependent heat capacities do not significantly alter noise production and scattering [33]; 3D-flow effects have little impact on entropy noise generation [29]. To end, hypotheses (iv) and (v) do not apply to 2D numerical simulations.…”