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Research Papers: Forced Convection

Effects of Unsteady Wake on Heat Transfer of Endwall Surface in Linear Cascade

[+] Author and Article Information
Jun Su Park, Eui Yeop Jung

Department of Mechanical Engineering,
Yonsei University,
Seoul 120-749, Korea

Dong Hyun Lee

Korea Institute of Energy Research,
Daejeon 305-343, Korea

Kyung Min Kim

Korea District Heating Corp.,
Seoul 135-220, Korea

Beom Soo Kim

Korea Electric Power Research Institute,
Daejeon 305-380, Korea

Byoung Moon Chang

KOREA LOST WAX Co.,
Ansan 425-836, Korea

Hyung hee Cho

Department of Mechanical Engineering,
Yonsei University,
Seoul 120-749, Korea
e-mail: hhcho@yonsei.ac.kr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 31, 2013; final manuscript received December 24, 2013; published online March 7, 2014. Assoc. Editor: James A. Liburdy.

J. Heat Transfer 136(6), 061701 (Mar 07, 2014) (8 pages) Paper No: HT-13-1384; doi: 10.1115/1.4026373 History: Received July 31, 2013; Revised December 24, 2013

The present study aimed to investigate the effect of an unsteady wake on the heat transfer for the endwall surface of a linear of cascade turbine blade. A naphthalene sublimation method was implemented to obtain the detailed heat/mass transfer distributions on the endwall surface. Tests were conducted on a five-passage linear cascade in a low-speed wind tunnel. The effects of unsteady wakes were simulated in the facility by a wake generator consisting of circular rods that were traversed across the inlet flow. The test conditions were fixed at a Reynolds number of 70,000 based on the inlet velocity and chord length. The flow coefficients were varied from 1.3 to 4.2 and the range of Strouhal number was 0.1–0.3. The results showed that the heat transfer distributions differed between steady and unsteady cases. The overall heat transfer for the unsteady cases was higher, and the heat transfer was enhanced with increasing the Strouhal number due to the resulting thin boundary layer and high turbulence intensity. Therefore, a cooling system for the endwall of a rotor should focus on reducing the high temperatures on the endwall surface induced by the unsteady wakes.

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References

Figures

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Fig. 1

Vortex model in a turbine cascade from Wang et al. [4]

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Fig. 2

Overall layout of the experimental apparatus

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Fig. 3

Pressure coefficients on blade near the endwall (5 of S) for various Strouhal number

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Fig. 4

Temporal velocity distribution of the inlet flow at mid-span for various Strouhal number; (a) Sb = 0, (b) Sb = 0.1, (c) Sb = 0.2, and (d) Sb = 0.3

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Fig. 5

Time-averaged velocity distribution along the spanwise direction for various Strouhal number

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Fig. 6

Heat/mass transfer distribution on the endwall for various Strouhal number; (a) Sb = 0, (b) Sb = 0.1, (c) Sb = 0.2, and (d) Sb = 0.3

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Fig. 7

Local heat/mass transfer distribution on the endwall for various Strouhal number; (a) x/C = 0.0, (b) x/C = 0.2, (c) x/C = 0.4, (d) x/C = 0.6, and (e) x/C = 0.7

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