Numerical Inspection of Location, Density Ratio, and Turbulent Kinetic Energy of Vortex Generator in Gas Turbine Blade Film Cooling Application

Abstract

Present numerical investigation proposes to mitigate the effects of Counter rotating vortex pair by employing vortex generator. The common-flow-down arrangement of delta winglet pair is preferred for this investigation. The investigation of suitable turbulence model has been studied. Numerical simulation has been carried out to investigate the effect of placement of vortex generator on the characteristics of film cooling effectiveness. Vortex generator located at upstream, downstream and both before, after and both before, after film cooling hole respectively. Result indicates that Vortex generator, located at up-stream of circular film cooling hole will yield better effectiveness. Reynolds number based on free stream velocity and film cooling-hole dimension is kept at 17000. Moreover consequence, in variation of blowing ratio (M = 0.5, 1, 1.5), density ratio (DR = 0.5, 1, 2), secondary flow velocity or jet velocity (uj) and T.K.E on cooling effectiveness has been investigated. Result shows that increment in M, uj and T.K.E responsible for decrement in cooling effectiveness. The results are compared with baseline case. It has been observed that numerical investigation implementing FLUENT commercial code adopting the k-omega SST turbulence model perform better.