Effect of lid height and blowing ratio on film cooling effectiveness of a novel lidded hole configuration

Guelailia, Ahmed; Khorsi, Azzeddine; Slimane, Sid Ahmed; Blala, Hamza; Slimane, Abdelkader; Salem, Houria; Bouferrouk, Abdessalem

Abstract

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–ε 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.

Citation

Guelailia, A., Khorsi, A., Slimane, S. A., Blala, H., Slimane, A., Salem, H., & Bouferrouk, A. (2022). Effect of lid height and blowing ratio on film cooling effectiveness of a novel lidded hole configuration. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 236(6), 2599-2607. https://doi.org/10.1177/09544089221095665

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2022
• Online Publication Date: May 2, 2022
• Publication Date: Dec 1, 2022
• Deposit Date: May 6, 2022
• Publicly Available Date: May 6, 2022
• Journal: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
• Print ISSN: 0954-4089
• Electronic ISSN: 2041-3009
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Volume: 236
• Issue: 6
• Pages: 2599-2607
• DOI: https://doi.org/10.1177/09544089221095665
• Keywords: Industrial and Manufacturing Engineering; Mechanical Engineering; Computational fluid dynamics; film cooling effectiveness; blowing ratio; heat and mass transfer; lidded hole
• Public URL: https://uwe-repository.worktribe.com/output/9459022