Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
Volume 236, Issue 6, Pages 2599-2607Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/09544089221095665
Keywords
Computational fluid dynamics; film cooling effectiveness; blowing ratio; heat and mass transfer; lidded hole
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This paper proposes a novel shape of film cooling injection hole called lidded hole, and numerically investigates its cooling performance. The results show that the lidded hole configuration can significantly enhance the film cooling effectiveness, especially under certain lid height and blowing ratio conditions.
Film cooling is one of the promising technologies used for protecting rocket nozzles and turbine blades from combustion chamber hot gases. This paper proposes a novel shape of film cooling injection hole, called lidded hole, that can offer significant enhancement of cooling performance. ANSYS CFX is used to perform 3D numerical simulations of a flat plate with a single row of lidded holes, in which the k-epsilon model approximates turbulence effects. Four cases are investigated to highlight the influence of the hole's lid height (H/d = 0, 0.25, 0.5, 0.75). The effect of blowing ratios (M = 0.5, 1, 1.5) is also analyzed for each configuration. The numerical results of this study are compared with available experimental data, and, generally, a good agreement is achieved. The results obtained show that the lidded hole configuration reduces the coolant flow separation which improves significantly the film cooling effectiveness. In addition, increasing the blowing ratio leads to an increase in lateral and centerline cooling effectiveness. Comparing all studied cases, the optimum coolant coverage was obtained for the lidded hole configuration with H/d = 0.25 at M = 1.5.
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