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Research Papers

High Rotation Number Effect on Heat Transfer in a Leading Edge Cooling Channel of Gas Turbine Blades With Three Channel Orientations

[+] Author and Article Information
Yao-Hsien Liu

e-mail: yhliu@mail.nctu.edu.tw
Department of Mechanical Engineering,
National Chiao-Tung University,
Hsinchu 30010, Taiwan

Manuscript received July 18, 2012; final manuscript received January 17, 2013; published online September 27, 2013. Assoc. Editor: Srinath V. Ekkad.

J. Thermal Sci. Eng. Appl 5(4), 041003 (Sep 27, 2013) (11 pages) Paper No: TSEA-12-1112; doi: 10.1115/1.4023888 History: Received July 18, 2012; Revised January 17, 2013

Heat transfer in a leading edge, triangular-shaped cooling channel with three channel orientations under high rotation numbers is investigated in this study. Continuous ribs and V-shaped ribs (P/e = 9, e/Dh = 0.085), both placed at an angle (α = 45 deg) to the mainstream flow, are applied on the leading and trailing surfaces. The Reynolds number range is 15,000–25,000 and the rotation number range is 0–0.65. Effects of high rotation number on heat transfer with three angles of rotation (90 deg, 67.5 deg, and 45 deg) are tested. Results show that heat transfer is influenced by the combined effects of rib and channel orientation. When the rotation number is smaller than 0.4, rotation causes a decrease in the average Nusselt number ratios on the leading surface at a channel orientation of 90 deg. Heat transfer is enhanced gradually on the leading surface when the channel orientation varies from 90 deg to 45 deg for both ribbed cases. The highest heat transfer enhancement due to rotation is found at the highest rotation number of 0.65.

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Figures

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Fig. 1

Internal cooling channels of gas turbine blade

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Fig. 3

Triangular-shaped cooling channel

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Fig. 4

Cross-sectional view of the test section

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Fig. 6

Nusselt number ratio in the nonrotating channel

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Fig. 7

Nusselt number ratio distribution in the rotating channel with continuous ribs (Re = 25,000)

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Fig. 8

Nusselt number ratio distribution in the rotating channel with V-shaped ribs (Re = 25,000)

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Fig. 9

Conceptual view of the rib- and rotation-induced secondary flow

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Fig. 10

Local Nusselt number ratios (Nur/Nus) in the rotating channel with continuous ribs

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Fig. 11

Local Nusselt number ratios (Nur/Nus) in the rotating channel with V-shaped ribs

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Fig. 12

Spanwise-averaged Nusselt number ratios in the rotating ribbed channel

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Fig. 13

Overall-averaged Nusselt number ratios with rotation number and average buoyancy parameter

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Fig. 14

Comparison of developed correlations with the measurement

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