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Research Papers

Heat Transfer in Trailing Edge Wedge-Shaped Pin-Fin Channels With Slot Ejection Under High Rotation Numbers

[+] Author and Article Information
Akhilesh P. Rallabandi

 Department of Mechanical Engineering, Turbine Heat Transfer Laboratory, Texas A&M University, College Station, TX 77843-3123akhlsh@tamu.edu

Yao-Hsien Liu

 Department of Mechanical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwanyhliu@mail.nctu.edu.tw

Je-Chin Han

 Department of Mechanical Engineering, Turbine Heat Transfer Laboratory, Texas A&M University, College Station, TX 77843-3123jc-han@tamu.edu

J. Thermal Sci. Eng. Appl 3(2), 021007 (Jul 22, 2011) (9 pages) doi:10.1115/1.4003746 History: Received July 22, 2010; Accepted February 27, 2011; Published July 22, 2011; Online July 22, 2011

The heat transfer characteristics of a rotating pin-fin roughened wedge-shaped channel have been studied. The model incorporates ejection through slots machined on the narrower end of the wedge, simulating a rotor blade trailing edge. The copper plate regional average method is used to determine the heat transfer coefficient; pressure taps have been used to estimate the flow discharged through each slot. Tests have been conducted at high rotation (1) and buoyancy (2) numbers, in a pressurized rotating rig. Reynolds numbers investigated range from 10,000 to 40,000 and inlet rotation numbers range from 0 to 0.8. Pin-fins studied are made of copper. Results show high heat transfer in the proximity of the slot. A significant enhancement in heat transfer due to the pin-fins, compared with a smooth channel, is observed. Results also show a strong rotation effect, increasing significantly the heat transfer on the trailing surface and reducing the heat transfer on the leading surface.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 12

Effect of Reynolds number on channel averaged normalized Nusselt number. Channel average includes both leading and trailing surfaces.

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Figure 13

Effect of buoyancy parameter Nusselt number enhancement on leading and trailing surfaces and side wall

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Figure 1

Schematic of gas turbine blade, showing various different cooling techniques commonly used. Current area of emphasis is the trailing edge region, as shown.

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Figure 2

CAD image showing rotating arm, pressure vessel, slip ring, and rotary unions

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Figure 6

Local Nusselt number distributions for 0 rpm and 400 rpm at Re = 10,000, for [(a) and (b)] smooth, [(c) and (d)] full copper pin-fins, and [(e) and (f)] partial copper pin-fins

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Figure 7

Local Nusselt number distributions for 0 rpm and 400 rpm at Re = 40,000, for [(a) and (b)] smooth, [(c) and (d)] full copper pin-fins, and [(e) and (f)] partial copper pin-fins

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Figure 8

(a) Sketch of anticipated flow structures due to full pin-fins and (b) sketch of anticipated flow structures due to partial pin-fins

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Figure 9

Effect of local rotation number on local Nusselt number distributions for smooth channel for two different regions (No. 2 and No. 4)

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Figure 10

Effect of local rotation number on local Nusselt number distributions for full-conductive pin-fin roughened channel for two different regions (No. 2 and No. 4)

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Figure 11

Effect of local rotation number on local Nusselt number distributions for partial-conductive pin-fin roughened channel for two different regions (No. 2 and No. 4)

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Figure 3

Arrangement of pin-fins in test section

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Figure 4

Various important dimensions in test section, showing details of pin arrangements and flow schematics

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Figure 5

Local Reynolds number distribution for 0 rpm and 400 rpm at Re = 10,000 and 40,000 for partial pin-fins. Data for smooth channel and full copper pin-fin channels are also measured to be identical.

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