Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

Orhan Yalçınkaya, Ufuk Durmaz, Ahmet Ümit Tepe, Ali Cemal Benim () and Ünal Uysal
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Orhan Yalçınkaya: Mechanical Engineering Department, Faculty of Engineering, Sakarya University, 54050 Sakarya, Türkiye
Ufuk Durmaz: Mechanical Engineering Department, Faculty of Engineering, Sakarya University, 54050 Sakarya, Türkiye
Ahmet Ümit Tepe: Department of Electricity and Energy, Vocational School of Technical Sciences at Mersin Tarsus Organized Industrial Zone, Tarsus University, 33100 Mersin, Türkiye
Ali Cemal Benim: Center of Flow Simulation (CFS), Faculty of Mechanical and Process Engineering, Düsseldorf University of Applied Sciences, Münsterstr. 156, 40476 Düsseldorf, Germany
Ünal Uysal: Mechanical Engineering Department, Faculty of Engineering, Sakarya University, 54050 Sakarya, Türkiye

Energies, 2024, vol. 17, issue 5, 1-21

Abstract: The main purpose of this investigation was to explore the heat transfer and flow characteristics of aero-foil-shaped fins combined with extended jet holes, specifically focusing on their feasibility in cooling turbine blades. In this study, a comprehensive investigation was carried out by applying impinging jet array cooling ( IJAC ) on a semi-circular curved surface, which was roughened using aerofoil-shaped fins. Numerical computations were conducted under three different Reynolds numbers ( Re ) ranging from 5000 to 25,000, while nozzle-to-target surface spacings ( S / d ) ranged from 0.5 to 8.0. Furthermore, an assessment was made of the impact of different fin arrangements, single-row ( L 1 ), double-row ( L 2 ), and triple-row ( L 3 ), on convective heat transfer. Detailed examinations were performed on area-averaged and local Nusselt ( Nu ) numbers, flow properties, and the thermal performance criterion ( TPC ) on finned and smooth target surfaces. The study’s results revealed that the use of aerofoil-shaped fins and the reduction in S / d , along with surface roughening, led to significant increases in the local and area-averaged Nu numbers compared to the conventional IJAC scheme. The most notable heat transfer enhancement was observed at S / d = 0.5 utilizing extended jets and the surface design incorporating aerofoil-shaped fins. Under these specific conditions, the maximum heat transfer enhancement reached 52.81%. Moreover, the investigation also demonstrated that the highest TPC on the finned surface was achieved when S / d = 2.0 for L 2 at Re = 25,000, resulting in a TPC value of 1.12. Furthermore, reducing S / d and mounting aerofoil-shaped fins on the surface yielded a more uniform heat transfer distribution on the relevant surface than IJAC with a smooth surface, ensuring a relatively more uniform heat transfer distribution to minimize the risk of localized overheating.

Keywords: aerofoil-shaped fin; impinging jet array; cooling of turbine blades; heat transfer uniformity; pin-fin row (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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