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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019025848
pages 1285-1305

EFFECTIVENESS OF IMPINGING-FILM COOLING FOR DIFFERENT INDUCTING SLABS

Jieli Wei
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China
Jingyu Zhang
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China; Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing, Jiangsu 210016, China
Xiaomin He
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China; Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing, Jiangsu 210016, China
Yi Jin
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China; Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing, Jiangsu 210016, China
Ji Li
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China
Mei Zheng
Nanjing Engineering Institute of Aircraft Systems, AVIC/Aviation Key Laboratory of Science Technology on Aero Electromechanical System Integration, Nanjing, Jiangsu 210016, China

RESUMO

In this paper, the effects of the impinging-film cooling effectiveness η for different inducting slabs are investigated experimentally and numerically. The cross section of an inducting slab (Rec or Tri), the layout of the cooling scheme (f-type and t-type) and an inducting channel (convergent, uniform, and divergent) were considered. The mainstream temperature was 403 K; and that of the coolant was ambient (298 K). The density flow ratio (DFR) ranging from 2.30 to 9.70 was considered. The cooling effectiveness η was obtained from experiment, while a numerical solution gave the detailed flow characteristics. The results show that the cooling effectiveness η increases with a raise in DFR. Triangular cross-sectional inducting slab (Tri) shows larger cooling effectiveness η as well as lower turbulence intensity than that of rectangular one (Rec) in an f-type layout. The comparison of the different cooling layouts shows that under the same conditions, the f-type layout presents better cooling performance than that of the t-type one. For inducting channel alteration, a uniform one gives better cooling performance in the initial section of the film with streamwise location x/d < 18, whereas a convergent one performs best after x/d = 18.

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