Abstract
This study presents a computational investigation of film cooling enhancement using novel trenched-hole geometries. By using validated computational fluid dynamics (CFD) simulations and the Renormalization Group (RNG) k–ε turbulence model, seven configurations were analyzed over a range of blowing ratios (M = 0.5, 1.0, and 1.5). The results show that intermediate trench widths significantly improve lateral coolant dispersion and reduce counterrotating vortex pair (CRVP) effects, leading to enhanced adiabatic film cooling effectiveness. Among all cases, the configuration with moderate trench width (case 4) achieved the highest performance at a blowing ratio of M = 1.0, offering an optimal balance between cooling coverage and aerodynamic pressure loss. These findings provide insight into trench design strategies for improved thermal protection in gas turbine components.
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