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Research Papers

Numerical Investigation on the Modified Bend Geometry of a Rotating Multipass Internal Cooling Passage in a Gas Turbine Blade

[+] Author and Article Information
Naris Pattanaprates

Department of Mechanical Engineering,
Faculty of Engineering,
Kasetsart University,
Bangkok 10900, Thailand
e-mail: naris.patt@gmail.com

Ekachai Juntasaro

Department of Mechanical and
Process Engineering,
The Sirindhorn International Thai-German
Graduate School of Engineering (TGGS),
King Mongkut's University of Technology
North Bangkok,
Bangkok 10800, Thailand
e-mail: ekachai.j@tggs.kmutnb.ac.th

Varangrat Juntasaro

Department of Mechanical Engineering,
Faculty of Engineering,
Kasetsart University,
Bangkok 10900, Thailand
e-mail: varangrat.j@ku.th

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received July 23, 2017; final manuscript received May 15, 2018; published online August 6, 2018. Assoc. Editor: Ting Wang.

J. Thermal Sci. Eng. Appl 10(6), 061003 (Aug 06, 2018) (9 pages) Paper No: TSEA-17-1266; doi: 10.1115/1.4040654 History: Received July 23, 2017; Revised May 15, 2018

The present work is aimed to investigate whether the modification to the bend geometry of a multipass internal cooling passage in a gas turbine blade can enhance heat transfer and reduce pressure drop. The two-pass channel and the four-pass channel are modified at the bend from the U shape to the bulb and bow shape. The first objective of the work is to investigate whether the modified design will still improve heat transfer with reduced pressure drop in a four-pass channel as in the case of a two-pass channel. It is found out that, unlike the two-pass channel, the heat transfer is not improved but the pressure drop is still reduced for the four-pass channel. The second objective is to investigate the rotating effect on heat transfer and pressure drop in the cases of two-pass and four-pass channels for both original and modified designs. It is found out that heat transfer is improved with reduced pressure drop for all cases. However, the modified design results in the less improvement on heat transfer and lower reduced pressure drop as the rotation number increases. It can be concluded from the present work that the modification can solve the problem of pressure drop without causing the degradation of heat transfer for all cases. The two-pass channel with modified bend results in the highest heat transfer and the lowest pressure drop for rotating cases.

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References

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Figures

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Fig. 3

The validation of the present simulation with the experimental data

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Fig. 2

Mesh for the simulation in ANSYS fluent

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Fig. 1

Channels with U-bend and modified bend

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Fig. 4

Grid independency test

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Fig. 5

Contours of velocity magnitude for nonrotating channels: (a) leading wall, (b) midplane, and (c) trailing wall

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Fig. 13

Nusselt number for non-rotating channels

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Fig. 14

Contours of TKE for rotating two-pass channels: (a) leading wall, (b) midplane, and (c) trailing wall

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Fig. 15

Contours of TKE for rotating four-pass channels: (a) leading wall, (b) midplane, and (c) trailing wall

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Fig. 6

Local friction factor for nonrotating channels

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Fig. 7

Contours of velocity magnitude for rotating two-pass channels: (a) leading wall, (b) midplane, and (c) trailing wall

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Fig. 8

Contours of velocity magnitude for rotating four-pass channels: (a) leading wall, (b) midplane, and (c) trailing wall

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Fig. 9

Overall friction factor for channels with different Ro

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Fig. 10

Perpendicular plane for heat transfer investigation

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Fig. 11

Contours of TKE for nonrotating channels: (a) leading wall, (b) midplane, and (c) trailing wall

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Fig. 12

Contours of TKE at the turns

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Fig. 16

Contours of TKE in the third turn of the modified channel with different Ro

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Fig. 17

Overall Nusselt number for channels with different Ro

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Fig. 18

Thermal performance factor for channels with different Ro

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