Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 50 6 2019 02 20 Numerical Investigation of the Effect of Plasma Actuator on the Film Cooling Effectiveness By Fan-Shaped Hole Numerical Investigation of the Effect of Plasma Actuator on the Film Cooling Effectiveness By Fan-Shaped Hole 1213 1228 1088 10.22060/mej.2017.12242.5287 FA S. Dolati Faculty of Mechanical Engineering, Guilan University, Guilan, Iran N. Amanifard Faculty of Mechanical Engineering, Guilan University, Guilan, Iran H. Mohaddes Deylami Faculty of Technology and Engineering, East of Guilan, Guilan University, Guilan, Iran 0000-0003-1125-2134 Journal Article 2016 12 12 In the present study, the effects of plasma actuator on the flow and thermal fields of the film cooling through a single row of inclined fan-shaped hole over a flat plate model have been investigated. Numerical simulations have been conducted for analyzing incompressible, turbulent and steady fluid flow. Simulations were implemented using non uniform structured grid and Low- Re k-ε turbulence model. The present computed results have been compared with the numerical and experimental results and it can be seen that the gained film cooling effectiveness distributions on the flat plate agree very well with them. Then, at constant degree injection angle, length-to-diameter ratio and density ratio, investigation has been implemented, with different blowing ratios of 0.25, 0.5 and 1, applied voltages of 0, 16 and 24kV and different velocities of 4.5, 9 and 45m/s. Based on the results, fan-shaped injection hole creates better film cooling performance. And also, the effect of plasma actuator on film cooling effectiveness is better at lower blowing ratios and this improvement becomes more obvious at higher applied voltages. Also, its performance is better in low velocities. Finally, the best situation for improvement of effectiveness is in higher voltages, lower blowing ratios and low velocities. In the present study, the effects of plasma actuator on the flow and thermal fields of the film cooling through a single row of inclined fan-shaped hole over a flat plate model have been investigated. Numerical simulations have been conducted for analyzing incompressible, turbulent and steady fluid flow. Simulations were implemented using non uniform structured grid and Low- Re k-ε turbulence model. The present computed results have been compared with the numerical and experimental results and it can be seen that the gained film cooling effectiveness distributions on the flat plate agree very well with them. Then, at constant degree injection angle, length-to-diameter ratio and density ratio, investigation has been implemented, with different blowing ratios of 0.25, 0.5 and 1, applied voltages of 0, 16 and 24kV and different velocities of 4.5, 9 and 45m/s. Based on the results, fan-shaped injection hole creates better film cooling performance. And also, the effect of plasma actuator on film cooling effectiveness is better at lower blowing ratios and this improvement becomes more obvious at higher applied voltages. Also, its performance is better in low velocities. Finally, the best situation for improvement of effectiveness is in higher voltages, lower blowing ratios and low velocities. https://mej.aut.ac.ir/article_1088_b1563a78ec59337587f6ab6397699afc.pdf