Experimental Investigation on Vortex Generator's Shape and Configuration in Film Cooling

Experimental techniques have been used to investigate the effects of vortex generator shape, configuration, and film cooling hole on improving the film cooling efficiency of gas turbine blades. The temperature field has been studied using the infrared (IR) thermography technique. Utilizing ANSYS FLUENT, the velocity field has been obtained. The Reynolds number, which is set at 2369, is determined by the cross-flow velocity and the diameter of the film cooling hole. The jet to cross-flow blowing ratio has been adjusted to 0.5, 1.0, and 1.5. Research has been done on the effects of common flow up and common flow down configurations. It has been noted that the vortex generator's common flow down configuration outperforms its common flow up variant. Because the common flow down configuration produces secondary longitudinal vortices that weaken the counter rotating vortex structures, it improves the effectiveness of film cooling. The rectangular vortex generator outperforms the triangular, rectangular, and trapezoidal shapes. The presence of a vortex generator modifies the growth of shear layer vortices. Due to the generation of secondary longitudinal vortices that completely destroy counter rotating vortex structures because they have a rotational tendency opposite to that of the counter rotating vortex pair (CRVP), the delta winglet pair with common flow down configuration outperforms the common flow up configuration overall.