Effect of Mainstream Velocity on the Optimization of a Fan-Shaped Film-Cooling Hole on a Flat Plate

In this study, the effect of mainstream velocity on optimization a fan-shaped hole flat plate was experimentally investigated. The experiment conducted by changing forward expansion angle (?fwd), lateral (?lat), and metering length ratio (Lm/D) film-cooling hole. A total 13 cases extracted using Box–Behnken method were considered to examine shape parameters under 90 m/s condition, results compared with derived 20 m/s. One density (DR = 2.0) blowing (M) ranging from 1.0 2.5 considered, pressure-sensitive paint (PSP) technique applied for effectiveness (FCE). As result experiment, optimized showed 49.3% improvement in overall averaged FCE reference DR 2.0 M 2.0. increased, exit area tended increase, tendency same as that condition.