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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Yonsei University,
Yonsei University,
Yonsei University,
e-mail: hhcho@yonsei.ac.kr
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Research-Article
Effects of Unsteady Wake on Heat Transfer of Endwall Surface in Linear Cascade
Jun Su Park,
Yonsei University,
Jun Su Park
Department of Mechanical Engineering
,Yonsei University,
Seoul 120-749
, Korea
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Eui Yeop Jung,
Yonsei University,
Eui Yeop Jung
Department of Mechanical Engineering
,Yonsei University,
Seoul 120-749
, Korea
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Dong Hyun Lee,
Dong Hyun Lee
Korea Institute of Energy Research
,Daejeon 305-343
, Korea
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Kyung Min Kim,
Kyung Min Kim
Korea District Heating Corp.
,Seoul 135-220
, Korea
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Beom Soo Kim,
Beom Soo Kim
Korea Electric Power Research Institute
,Daejeon 305-380
, Korea
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Byoung Moon Chang,
Byoung Moon Chang
KOREA LOST WAX Co.
,Ansan 425-836
, Korea
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Hyung hee Cho
Yonsei University,
e-mail: hhcho@yonsei.ac.kr
Hyung hee Cho
1
Department of Mechanical Engineering
,Yonsei University,
Seoul 120-749
, Korea
e-mail: hhcho@yonsei.ac.kr
1Corresponding author.
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Jun Su Park
Department of Mechanical Engineering
,Yonsei University,
Seoul 120-749
, Korea
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. Jun 2014, 136(6): 061701 (8 pages)
Published Online: March 7, 2014
Article history
Received:
July 31, 2013
Revision Received:
December 24, 2013
Citation
Park, J. S., Jung, E. Y., Lee, D. H., Kim, K. M., Kim, B. S., Chang, B. M., and Cho, H. H. (March 7, 2014). "Effects of Unsteady Wake on Heat Transfer of Endwall Surface in Linear Cascade." ASME. J. Heat Transfer. June 2014; 136(6): 061701. https://doi.org/10.1115/1.4026373
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