Influence of delta wing vortex generator on counter rotating vortex pair in film cooling application of gas turbine blade

Abstract

Numerical inspection concerning to alleviate the effect of Counter Rotating Vortex Pair (CRVP) adopting delta winglet type vortex generators (VGs) has been contemplated in present study. The jet to cross flow blowing ratios is investigated at 2, while Reynolds number based on jet velocity and film-hole diameter is kept at 4700. Two different geometric configurations are considered. With the absence of Delta winglet pair (DWP) a single 35° inclined holes on a horizontal bottom surface of mainstream flow (primary flow) domain, is chosen for baseline case. While base line with Common-flow-up (CFU) arrangement of DWP, is preferred as another one. The numerical investigation is executed with FLUENT commercial code implementing the k-ε model. Computational investigation represents that contemporary procedure enhances the film cooling by creating opposite vortices to CRVP. These obverse vortices, created from CFU DWP configurations, assist in maintaining the jet flow adjacent to the bottom wall of mainstream domain.