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Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019025848
Forthcoming Article

Cooling effectiveness of impinging-film cooling for different inducting slabs

Jieli Wei
NUAA
Jingyu Zhang
NUAA
Xiaomin He
NUAA
Yi Jin
NUAA
Ji Li
NUAA
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

This paper experimentally and numerically investigates the effects on the cooling effectiveness η of impinging-film cooling with different inducting slabs. The cross-section of inducting slab (Rec or Tri), the layout of cooling scheme (f-type and t-type) and inducting channel (convergent, uniform and divergent) are considered. The mainstream temperature is 403K; and that of the coolant is ambient temperature (298K). The density flow ratio (DFR) ranging from 2.30 to 9.70 is considered. The cooling effectiveness η is obtained from experiment while numerical solution gives the detail 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 f-type layout. The comparison of the different cooling layouts gives that under the same conditions, the f-type layout presents better cooling performance than that of t-type one. For inducting channel alteration, uniform one gives better cooling performance in initial section of the film with stream-wise location x/d<18, whereas convergent one performs best after x/d=18.