Computational Simulation of Cylindrical Film Hole with Jet Pulsation on Flat Plates

Film cooling of flat plates with pulsation were simulated using FLUENT(TM) commercial code with realizable k-[varepsilon]k-[varepsilon] turbulence model. The simulations were done for nominal blowing ratios 0.5 and 1.5, duty cycle=50%cycle=50%, and Strouhal number ranging from 0.0119 to 1.0. Pulsation helps to lower the amount of cool air from the compressor, which is desirable for film-cooling applications. Pulsed jets performance significantly depends on geometry and blowing ratio. From the cases studied and for steady flow with attached jets, pulsation considerably decreases the film-cooling effectiveness. On the other hand, for steady flow cases where jet liftoff occurs (e.g., higher blowing ratios), pulsation helps to increase the film-cooling effectiveness. [PUBLISHER ABSTRACT]