Abhishek Verma, Debi Prasad Mishra

Abstract: A two-phase numerical investigation on trench-shaped injection holes for film cooling is being conducted using Reynolds-averaged Navier-Stokes simulations to assess their practical effectiveness. The study focuses on the cooling performance of a novel type of film hole, known as straight transverse trenches attached to a flat plate, using a mixture of water mist and air in the coolant fluid. The examination considers film cooling with varying turbulent intensities (3%, 10%, and 20%) and mist concentrations (4%, 7%, and 10%). The analysis involves adiabatic laterally averaged and area-averaged (overall) mist film cooling effectiveness parameters, with two blowing ratios ranging from 0.6 to 1.0. The findings indicate that trenched cooling holes exhibit a more uniform coolant distribution laterally at all positions especially at higher mist concentrations, resulting in enhanced cooling performance, particularly at high blowing ratios.

Keywords: Film-cooling, effectiveness, mist, trench-hole, turbulent

Date Published: July 29, 2024
DOI: 10.11159/jffhmt.2024.020

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