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Research Papers

Experimental and Numerical Investigation on the Film Cooling of Waist-Shaped Slot Holes Comparing With Converging Slot Holes

[+] Author and Article Information
Cun-liang Liu, Hui-ren Zhu, Jiang-tao Bai, Du-chun Xu

School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

J. Turbomach 134(1), 011021 (Jun 01, 2011) (11 pages) doi:10.1115/1.4003074 History: Received August 01, 2010; Revised August 08, 2010; Published June 01, 2011; Online June 01, 2011

Film cooling performance of a new shaped hole, waist-shaped slot hole, is studied in this paper. Experimental measurement and numerical simulation are carried out to investigate the film cooling character and physics of this new shaped hole. And comparisons between the waist-shaped slot hole and two kinds of console holes are also performed. Both the cooling effectiveness distribution and the heat transfer coefficient distribution of the waist-shaped slot hole are similar with those of the console hole with a large divergence angle because of the effect of the waist-shaped slot hole’s structure. The middle constriction structure of the waist-shaped slot hole and the coupled vortices makes jets from the waist-shaped slot holes produce higher cooling effectiveness in the midspan region between adjacent holes. And also due to the effect of the middle constriction structure, the heat transfer coefficient of the waist-shaped slot hole is very high in the upstream midspan region between adjacent holes. However, the heat transfer coefficient in the downstream midspan region is lower than that in the region near the hole centerline because of the effect of the coupled vortices. The waist-shaped slot holes provide the surface with very good thermal protection, especially in the upstream region. Although the console holes with small a exit-entry area ratio provide better thermal protection than the waist-shaped slot holes due to small turbulence intensity, the flow resistance characteristic of the waist-shaped slot hole, which has a larger exit-entry area ratio, is much better.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Diagrammatic sketch of thermal couples’ distribution in the test plate

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Figure 2

Sketch of the experiment system

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Figure 3

Configuration of the film-cooling hole rows in the present study

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Figure 4

Geometry of the computational model of the waist-shaped slot hole

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Figure 5

Computational grid around the hole for the computational model of the waist-shaped slot hole

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Figure 6

Computational grid for the waist-shaped slot hole

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Figure 7

Distributions of local film cooling effectiveness of the waist-shaped slot hole

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Figure 8

Distributions of local film cooling effectiveness of consoles under I=1

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Figure 9

Temperature contours and velocity vectors in the X/D=5 plane downstream of the film holes under I=1

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Figure 10

Streamwise distribution of laterally averaged η

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Figure 11

Turbulence intensity contours in the X/D=5 plane downstream of the film holes under I=1

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Figure 12

Distributions of local heat transfer coefficients of the waist-shaped slot hole

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Figure 13

Distributions of local heat transfer coefficients of consoles

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Figure 14

Streamwise distribution of laterally averaged h/h0

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Figure 15

Velocity ratio contours in the X/D=5 plane downstream of the film holes under I=1

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Figure 16

Streamwise distribution of laterally averaged q/q0

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Figure 17

Discharge coefficient for holes investigated

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