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Research Papers

Heat Transfer of a Rotating Rectangular Channel With a Diamond-Shaped Pin-Fin Array at High Rotation Numbers

[+] Author and Article Information
S. W. Chang

Professor
Thermal Fluids Laboratory,
National Kaohsiung Marine University,
No. 142 Haijhuan Road,
Nanzih District Kaohsiung City 81143
Taiwan, ROC
e-mail: swchang@mail.nkmu.edu.tw

T.-M. Liou

Professor
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101 Section 2 Kuang Fu Road,
Hsinchu 30013 Taiwan, ROC
e-mail: tmliou@pme.nthu.edu.tw

T.-H. Lee

Research student
Department of Marine Engineering,
National Kaohsiung Marine University,
No. 142 Haijhuan Road,
Nanzih District, Kaohsiung City 81143
Taiwan, ROC
e-mail: 991532105@stu.nkmu.edu.tw

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received July 4, 2012; final manuscript received August 3, 2012; published online June 3, 2013. Assoc. Editor: David Wisler.

J. Turbomach 135(4), 041007 (Jun 03, 2013) (10 pages) Paper No: TURBO-12-1125; doi: 10.1115/1.4007684 History: Received July 04, 2012; Revised August 03, 2012

This experimental study measured the detailed Nusselt numbers (Nu) distributions over two opposite leading and trailing walls of a rotating rectangular channel fitted with a diamond-shaped pin-fin array with radially outward flow for gas turbine rotor blade cooling applications. The combined and isolated effects of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers on local and area-averaged Nusselt numbers (Nu and Nu¯) were examined at the test conditions of 5000 ≤ Re ≤ 15,000, 0 ≤ Ro ≤ 0.6, and 0.0007 ≤ Bu ≤ 0.31. The present infrared thermography method enables the generation of full-field Nu scans over the rotating end walls at the realistic engine Ro conditions as the first attempt to reveal the combined rotating buoyancy and Coriolis force effects on heat transfer properties. The selected heat transfer results demonstrate the Coriolis and rotating-buoyancy effects on the heat transfer performances of this rotating channel. Acting by the combined Coriolis and rotating buoyancy effects on the area-averaged heat transfer properties, the rotating leading and trailing area-averaged Nusselt numbers are modified, respectively, to 0.82–1.52 and 1–1.89 times the static channel references. A set of physically consistent empirical Nu¯ correlations was generated to permit the assessments of individual and interdependent Re, Ro, and Bu effects on the area-averaged heat transfer properties over leading and trailing end walls.

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Figures

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Fig. 2

(a) End wall Nu0 distributions, (b) axial centerline Nu0 and Nu0/Nu profiles, and (c) and (d) spanwise (x-wise) Nu0 and Nu0/Nu profiles across pin rows 9 and 10 at Re = 15,000, Ro = 0

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Fig. 3

Nu¯0 and Nu¯0/Nu against Re on static end wall

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Fig. 4

(a) Leading and (b) trailing end wall Nu distributions. (c) Leading and (d) trailing axial centerline Nu and Nu/Nu0 profiles. (e)–(h) Leading and (i)–(l) trailing spanwise (x-wise) Nu and Nu/Nu0 profiles across pin rows 9 and 10 at Re = 5000, Ro = 0.4, Bu = 0.14.

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Fig. 1

(a) Test channel, (b) pin-fin array, (c) rotor arms, and (d) conceptual flow structure

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Fig. 9

Comparison of experimental Nu¯/Nu¯0 data with the calculative results

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Fig. 5

Detailed Nu distributions over leading and trailing end walls with ascending Ro from 0 to 0.3 at the nominal β(Tw − Tf) of 0.11 and Re of 7500

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Fig. 6

Detailed Nu distributions over rotating leading and trailing end walls with ascending Bu at Re = 7500, Ro = 0.3

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Fig. 7

Variations of Nu¯/Nu¯0 against Bu at fixed Ro of 0.075, 0.1, 0.15, 0.2, 0.3, 0.4, and 0.6

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Fig. 8

Variations of (a) ϕ1 and (b) ϕ2 against Ro at zero-buoyancy condition over leading and trailing end walls

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