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Research Papers

Film Cooling Performance of Converging-Slot Holes With Different Exit-Entry Area Ratios

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

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

J. Turbomach 133(1), 011020 (Sep 23, 2010) (11 pages) doi:10.1115/1.4000543 History: Received July 06, 2009; Revised July 15, 2009; Published September 23, 2010; Online September 23, 2010

Film cooling performances of two kinds of converging-slot-hole (console) with different exit-entry area ratios have been measured using a new transient liquid crystal measurement technique, which can process the nonuniform initial wall temperature. Four momentum ratios are tested. The film cooling effectiveness distribution features are similar for the two consoles under all the momentum ratios. Consoles with smaller exit-entry area ratio produce higher cooling effectiveness. And the laterally averaged cooling effectiveness results show that the best momentum ratio for both consoles’ film cooling effectiveness distribution is around 2. For both consoles, the heat transfer in the midspan region is stronger than that in the hole centerline region in the upstream but gradually becomes weaker as flowing downstream. With the momentum ratio increasing, the normalized heat transfer coefficient hh0 of both consoles increases. In the upstream, the heat transfer coefficient of console with small exit-entry area ratio is higher. But in the downstream, the jets’ turbulence and the couple vortices play notable elevating effect on the heat transfer coefficient for large exit-entry area ratio case, especially under small momentum ratios. Consoles with smaller exit-entry area ratio provide better thermal protection because of higher cooling effectiveness. And the distributions of heat flux ratio are similar with those of cooling effectiveness because the influence of η on qq0 is larger. For the consoles, smaller exit-entry area ratios produce lower discharge coefficients when the pressure variation caused by the hole shape is regarded as flow resistance.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of experiment system

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Figure 2

Diagrammatic sketch of thermal couples’ distribution in the test plate

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Figure 3

Configuration of the consoles in the present study

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Figure 4

Cylindrical hole results compared with published data

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Figure 5

Distributions of local film cooling effectiveness of console with AR=1.33

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Figure 6

Distributions of local film cooling effectiveness of console with AR=0.67

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Figure 7

Secondary vortices at cross-flow downstream of console

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Figure 8

Streamwise distribution of laterally averaged η

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Figure 9

Distributions of local heat transfer coefficients of console with AR=1.33

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Figure 10

Distributions of local heat transfer coefficients of console with AR=0.67

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Figure 11

Streamwise distribution of laterally averaged h∕h0

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Figure 12

Distributions of local heat flux ratios of console with AR=1.33

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Figure 13

Distributions of local heat flux ratios of console with AR=0.67

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Figure 14

Streamwise distribution of laterally averaged q∕q0

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Figure 15

Discharge coefficient for holes investigated

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