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Forced Convection

Performance Evaluation of a Novel Film-Cooling Hole

[+] Author and Article Information
Ki-Don Lee

Department of Mechanical Engineering,  Inha University, 253 Yonghyun-Dong, Nam-Gu,Incheon 402-751, Republic of Korealeekd@inha.edu

Kwang-Yong Kim1

Department of Mechanical Engineering,  Inha University, 253 Yonghyun-Dong, Nam-Gu,Incheon 402-751, Republic of Koreakykim@inha.ac.kr

1

Corresponding author.

J. Heat Transfer 134(10), 101702 (Aug 07, 2012) (7 pages) doi:10.1115/1.4006752 History: Received September 04, 2011; Revised April 11, 2012; Published August 06, 2012; Online August 07, 2012

This paper presents a numerical investigation of the film-cooling performance of a novel film-cooling hole in comparison with a fan-shaped hole. The novel shaped hole is designed to increase the lateral spreading of coolant on the cooling surface. The film-cooling performance of the novel shaped hole is evaluated at a density ratio of 1.75 and the range of the blowing ratio of 0.5–2.5. The simulations were performed using three-dimensional Reynolds-averaged Navier–Stokes analysis with the SST k-ω model. The numerical results for the fan-shaped hole show very good agreement with the experimental data. For the blowing ratio of 0.5, the novel shaped film-cooling hole shows a similar cooling performance as the fan-shaped hole. However, as the blowing ratio increases, the novel shaped hole shows greatly improved lateral spreading of the coolant and the cooling performance in terms of the film-cooling effectiveness in comparison with the fan-shaped hole.

FIGURES IN THIS ARTICLE
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Copyright © 2012 by American Society of Mechanical Engineers
Topics: Cooling , Coolants
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Figures

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Figure 1

Geometry of the novel shaped hole

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Figure 2

Geometry of the fan-shaped hole [3]

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Figure 3

The computational domain

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Figure 4

Grid system for the novel shaped hole

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Figure 5

The grid-dependency test: (a) velocity in the y direction (x/D = 1, z/D = 0) and (b) laterally averaged film-cooling effectiveness

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Figure 6

Experimental [3] and numerical results for the averaged film-cooling effectiveness: (a) laterally averaged film-cooling effectiveness and (b) spatially averaged film-cooling effectiveness

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Figure 7

Spanwise distributions of the film-cooling effectiveness (M = 2.5): (a) x/D = 4, (b) x/D = 20, and (c) x/D = 40

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Figure 8

Experimental [3] and numerical results for the local film-cooling effectiveness: (a) M = 0.5, (b) M = 1.0, (c) M = 1.5, and (d) M = 2.5

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Figure 9

Streamlines of the coolant and iso-surface (U/U∞  = 0.1, M = 2.5): (a) fan-shaped hole and (b) novel shaped hole

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Figure 10

Velocity contours at the hole exits of the novel and fan-shaped holes (M = 2.5): (a) normalized velocity component in the y-direction (v) and (b) normalized velocity component in the z-direction (w)

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Figure 11

Vorticity distributions on the y-z plane (M = 2.5): (a) x/D = 2 and (b) x/D = 10

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