Effect of Geometry and Array of Cooling Holes in Film Cooling Over an Adiabatic Flat Plate – A Computational Approach
Journal Title: REST Journal on Emerging trends in Modelling and Manufacturing - Year 2016, Vol 2, Issue 1
Abstract
Computational analysis has been carried out to find the film cooling effectiveness (centerline and spatially averaged) over an adiabatic flat plate. Variation in film cooling effectiveness has been determined along the downstream of the cooling holes on the flat plate. The study compares film cooling effectiveness over various blowing ratios, various hole shapes and rearrangement of holes. Here three different cooling hole shapes i.e. circular, square and fan shaped holes have been used for the present study. Numerical based solver Fluent has been used for the analysis using the standard Reynolds Averaged Navier-Stokes shear stress transport turbulence model. The numerical results reveal that the film cooling effectiveness increases with increase in blowing ratios. Beyond an optimum blowing ratio, film cooling effectiveness decreases due to coolant jet lift off and intermixing of coolant and mainstream flow at higher blowing ratio. Among the different cooling hole shapes, the best film cooling effectiveness was obtained for fan-shaped holes with blowing ratio equal to unity. Spatially averaged effectiveness for fan-shaped holes was found to be higher as compared to other hole shapes.
Authors and Affiliations
Madhurima Dey
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