Abhishek Verma, Debi Prasad Mishra

Abstract: Film cooling plays a crucial role in protecting gas turbine engine components from extreme temperatures. Recent research has highlighted the potential benefits of introducing water mist into film cooling holes. This study investigates the influence of varying mist droplet concentrations while maintaining a constant droplet size of 5μm. The cooling process is analyzed using the k-ε turbulence model with enhanced wall treatment. Key parameters such as the blowing ratio, momentum flux ratio, and jet vorticity are examined to assess their impact on cooling performance. To simulate the behavior of mist droplets, we employ the discrete phase model with a stochastic tracking approach, allowing for the detailed tracking of individual droplets within the flow field. Mist concentrations of 2%, 4%, 7%, and 10% are evaluated. The results indicate that at a blowing ratio of 1, a higher mist concentration of 10% enhances cooling effectiveness. At a BR of 2, the same mist concentration promotes deeper penetration of the coolant jet into the mainstream flow. In the far downstream region, higher mist concentrations aid in the development of the coolant film along the flat surface, further improving film cooling effectiveness. Additionally, the study highlights the significance of vortex structures generated by crossflow interactions, which play a vital role in coolant–mainstream mixing and overall cooling performance.

Keywords: Effectiveness, Laid-back fan-shaped, Film cooling, Mist models.

Date Published: June 9, 2025
DOI: 10.11159/jffhmt.2025.022

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