Computational investigation of curvature effects on jet impingement heat transfer at internally cooled turbine vane leading edge regions

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Computational investigation of curvature effects on jet impingement heat transfer at internally cooled turbine vane leading edge regions. / Luo, Lei; Zhang, Yifeng; Sundén, Bengt; Qiu, Dandan; Wang, Songtao; Zhang, Xinghong.

I: Heat Transfer Research, Vol. 51, Nr. 4, 2020, s. 333-357.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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T1 - Computational investigation of curvature effects on jet impingement heat transfer at internally cooled turbine vane leading edge regions

AU - Luo, Lei

AU - Zhang, Yifeng

AU - Sundén, Bengt

AU - Qiu, Dandan

AU - Wang, Songtao

AU - Zhang, Xinghong

PY - 2020

Y1 - 2020

N2 - 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 flow is directly impinging on the target surface and is 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 0.500 to 1.300 and the ratio between nozzle-to-target surface distance and diameter of impingement hole is ranging from 0.5 to 2.0. 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-fi nned channel are included. It is found that an increase of the target surface curvature has signifi cant 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.

AB - 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 flow is directly impinging on the target surface and is 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 0.500 to 1.300 and the ratio between nozzle-to-target surface distance and diameter of impingement hole is ranging from 0.5 to 2.0. 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-fi nned channel are included. It is found that an increase of the target surface curvature has signifi cant 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.

KW - Double-wall cooling structure

KW - Flow structure

KW - Friction factor

KW - Heat transfer

KW - Nozzle to target surface distance

KW - Target surface curvature

UR - http://www.scopus.com/inward/record.url?scp=85082739431&partnerID=8YFLogxK

U2 - 10.1615/HeatTransRes.2019029853

DO - 10.1615/HeatTransRes.2019029853

M3 - Article

AN - SCOPUS:85082739431

VL - 51

SP - 333

EP - 357

JO - Heat Transfer Research

JF - Heat Transfer Research

SN - 1064-2285

IS - 4

ER -