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Heat Transfer Research
インパクトファクター: 0.404 5年インパクトファクター: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN 印刷: 1064-2285
ISSN オンライン: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019029853
Forthcoming Article

Computational Investigation of Curvature Effects on Jet Impingement Heat Transfer at Internally Cooled Turbine Vane Leading Edge Regions

Bengt Sunden
Lund University
Lei Luo
Harbin Institute of Technology
Dandan Qiu
Harbin Institute of Technology
Yifeng Zhang
Harbin Institute of Technology
Songtao Wang
Harbin Institute of Technology
Xinghong Zhang
Harbin Institute of Technology

要約

This study is carried out by using numerical simulations to investigate the effect of target surface curvature and the nozzle to target surface distance on the flow structure and heat transfer characteristics in a pin finned double wall cooling structure. The impingement flow is directly impinging on the target surface and disturbed by the pin fins, and then released from the film holes after passing the double wall chamber. The ratio between the radius of the concave outer surface and the chord length of the concave outer surface is varied from 0.5 to 1.3 and the ratio between nozzle to target surface distance and diameter of impingement hole is ranging from 0.5 to 2. The Reynolds number is between 10,000 and 50,000. Results of the flow structure in the chamber, heat transfer on the target surface and friction factor of the pin finned channel are included. It is found that an increase of the target surface curvature has significantly effects on the flow structure and thus the heat transfer on the target surface is augmented. The Taylor-Görtler vortices near the pin fins are also influenced by the target surface curvature. On the other hand, the nozzle to target surface distance influences the jet impingement and the vortices, which are generated by the curvature, remarkably. It is found that the area goodness factor and volume goodness factor are improved by the surface curvature.