Title: Numerical investigation on the effect of sister holes on film cooling performance with Barchan-dune shaped shells
Authors: Mustapha Grine; Khadidja Boualem; Zineddine Ahmed Dellil; Abbès Azzi
Addresses: Département ELM, Institut de Maintenance et de Sécurité Industrielle, Université Mohamed Ben Ahmed Oran 2, Algeria ' Laboratoire d'Aéro-Hydrodynamique Navale, LAHN, Université des Sciences et de la Technologie d'Oran – Mohamed-Boudiaf, Algeria ' Département ELM, Institut de Maintenance et de Sécurité Industrielle, Université Mohamed Ben Ahmed Oran 2, Algeria ' Laboratoire d'Aéro-Hydrodynamique Navale, LAHN, Université des Sciences et de la Technologie d'Oran – Mohamed-Boudiaf, Algeria
Abstract: The film cooling is the traditional and efficient technique that is used to adopt the turbine cooling process, a new configuration that combines sister holes with Barchan-dune shaped shells (SH-BDS) is used in this study to improve the film cooling effectiveness laterally and at spanwise direction. The investigations are performed for high blowing ratios, M = 1 and 1.5. Three-dimensional Reynolds Averaged Navier-Stokes (RANS) equations with the RNG k-ε model are solved to simulate and analysis the thermal behaviour of this new configuration. The validation shows good agreement and almost all flow structures are well reproduced. It is found that the new configuration provides a significant change in the film cooling effectiveness results. Moreover, the counter-rotating vortex pairs structure (CRV) is nearly vanished. From this contribution, it is well demonstrated that this new technique (SH-BDS) has a great influence on the cooling process of the turbine and hence on its effective functioning.
Keywords: SH-BDS; BDS; sister holes; CRV; anti-CRV; film cooling.
Progress in Computational Fluid Dynamics, An International Journal, 2021 Vol.21 No.5, pp.296 - 304
Received: 28 Apr 2020
Accepted: 30 Oct 2020
Published online: 15 Jul 2021 *