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Research Papers

Thermal Performance of a Radially Rotating Twin-Pass Smooth-Walled Parallelogram Channel

[+] Author and Article Information
Tong-Miin Liou

Professor
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu City 30013, China
e-mail: tmliou@pme.nthu.edu.tw

Shyy Woei Chang

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

Chun-Chang Yang

Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu City 30013, China
e-mail: s9933824@m99.nthu.edu.tw

Yi-An Lan

Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu City 30013, China
e-mail: s9833871@m98.nthu.edu.tw

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) Division of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 16, 2014; final manuscript received July 20, 2014; published online August 26, 2014. Editor: Ronald Bunker.

J. Turbomach 136(12), 121007 (Aug 26, 2014) (14 pages) Paper No: TURBO-14-1153; doi: 10.1115/1.4028239 History: Received July 16, 2014; Revised July 20, 2014

An experimental study was performed to measure the detailed heat transfer distributions, Fanning friction factors (f), and thermal performance factors (TPF) of a radially rotating twin-pass parallelogram channel. Laboratory scale full field Nusselt number (Nu) distributions over leading endwall (Leading-E), and trailing endwall (Trailing-E) of the rotating channel are measured at the test conditions of 5000 < Re < 20,000, 0 < Ro < 0.3 and 0.028 < Δρ/ρ < 0.12. A selection of Nu data illustrates the individual and interactive impacts of Re, Ro, and buoyancy (Bu) numbers on local and area-averaged heat transfer properties. Without the additional flow complexities induced by the turbulators, the degrees of Bu impacts are significantly amplified from those developed in an enhanced rotating ribbed channel. Relative to the similar rotating square twin-pass channel, the heat transfer recovery over the stable wall proceeds at the lower Ro for present rotating parallelogram channel. Accompanying with the improved heat transfer performances from the square-channel counterparts, the f values are raised. With a set of f correlations generated using the f data collected from the Leading-S and Trailing-S at isothermal conditions; the TPF values at various rotating conditions were evaluated. The heat transfer correlations that determine the area-averaged Nusselt numbers over the inlet and outlet legs and over the turning region are generated. The area-averaged Nu, f factors, and TPF determined from the present rotating parallelogram channel are compared with those reported for the rotating twin-pass channels to determine the comparatively thermal performances of the parallelogram rotating channel for turbine rotor blade cooling.

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References

Figures

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Fig. 2

Heat transfer results and associated flow field for present parallelogram and square two-pass channels at Ro = 0

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Fig. 3

Regionally averaged Nu¯0 against Re for present parallelogram two-pass channel at Ro = 0

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Fig. 4

Detailed Nu distributions over (a) static/rotating, (b) Leading-E, (c) Trailing-E at Ro = 0.3, (d) centerline Nu0 and rotating leading/trailing Nu at Re = 5000, Ro = 0.3, and Bu = 0.13

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Fig. 5

Variations of Nu distributions over Leading-E at various Re, Ro, and Bu

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Fig. 6

Variations of Nu distributions over Trailing-E at various Re, Ro, and Bu

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Fig. 7

Endwall Nu/Nu (Sh/Sh) distributions of rotating parallelogram and square channels

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Fig. 8

Variations of Nu¯/Nu¯0 against Bu for rotating parallelogram and square channels

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Fig. 9

Variations of Ψ1 and Ψ2 against Ro for rotating parallelogram and square channels

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Fig. 10

f variations against Ro at fixed Re and f variations against Re at fixed Ro for leading/Trailing-E/sidewall

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Fig. 11

TPF variations against Re at fixed Ro with various Bu

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