Numerical Investigation Of The Effect of Plasma Actuator on Film Cooling Effectiveness

In this paper, a 2-D numerical approach was conducted for analyzing incompressible, turbulent and steady flow and thermal fields of the film cooling through using plasma actuator over a flat plate model. Simulations were implemented using non uniform structured grid and low-Re k-ε turbulence model. The present study was analyzed at 35 degree injection angle, hole length-to-diameter ratio (L/D) 5 and density ratio (DR) 1.2, with the present of plasma actuator. The flow and temperature fields were investigated with different blowing ratios and applied voltages. In addition, the effect of geometry parameters and position of plasma actuator has been studied on the adiabatic film cooling effectiveness. Based on the numerical analysis results, the effect of plasma actuator on film cooling effectiveness is better in lower blowing ratios and higher applied voltages and positions near the film hole. Unlike other similar works in this filed, this study has examined geometry parameters of plasma actuator and their effect on adiabatic film cooling effectiveness. These parameters include electrode gap distance and dielectric thickness. The results show that higher thickness has low effect on improving of film cooling effectiveness. But when electrode gap distance decreases, the performance of plasma actuator and average effectiveness enhances.