Effect of Velocity Ratio on Film Cooling and Turbulence Characteristics with Circular Injection

This study presents numerical simulations of film cooling and analyzes the turbulent kinetic energy (TKE) distribution over a flat surface using cylindrical injection holes. The k-ε turbulence model is used to investigate the effect of coolant injector outlet velocity on TKE and cooling effectiveness at different blowing ratios. The goal of the study is to investigate the impact of coolant injector outlet velocity on TKE and cooling effectiveness at different blowing ratios. Results show that increasing the outlet velocity within a certain limit enhances the lateral dispersion of coolant and boosts cooling effectiveness. TKE visualization reveals high turbulence and mixing between the coolant jet and mainstream gas. The analysis provides important insights into optimizing outlet velocity ratio and TKE distribution for improved film performance over a flat plate or surface. Specifically, the observation identifies a blowing ratio limit where further increases in outlet velocity do not enhance cooling effectiveness and shows that the greatest TKE is found between the coolant jet and mainstream gas. The applications of this study's findings span across several fields like thermal management in aerospace, heat exchangers and electronics cooling, automotive engineering, and power generation systems that require effective heat transfer and cooling strategies.