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Research Papers: Heat and Mass Transfer

Heat Transfer in a Rotating Cooling Channel (AR = 2:1) With Rib Turbulators and a Tip Turning Vane

[+] Author and Article Information
Andrew F. Chen

Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
e-mail: mrandrewchen@outlook.com

Hao-Wei Wu

Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
e-mail: zwoodwu@gmail.com

Nian Wang

Turbine Heat Transfer Laboratory,
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3123
e-mail: wangnian@gmail.com

Je-Chin Han

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 31, 2018; final manuscript received April 30, 2018; published online June 8, 2018. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 140(10), 102007 (Jun 08, 2018) (10 pages) Paper No: HT-18-1066; doi: 10.1115/1.4040260 History: Received January 31, 2018; Revised April 30, 2018

Experimental investigation on rotation and turning vane effects on heat transfer was performed in a two-pass rectangular internal cooling channel. The channel has an aspect ratio of AR = 2:1 and a 180 deg tip-turn, which is a scaled up model of a typical internal cooling passage of gas turbine airfoils. The leading surface (LS) and trailing surface (TS) are roughened with 45 deg angled parallel ribs (staggered P/e = 8, e/Dh = 0.1). Tests were performed in a pressurized vessel (570 kPa) where higher rotation numbers (Ro) can be achieved with a maximum Ro = 0.42. Five Reynolds numbers (Re) were examined (Re = 10,000–40,000). At each Reynolds number, five rotational speeds ( = 0–400 rpm) were considered. Results showed that rotation effects are stronger in the tip regions as compared to other surfaces. Heat transfer enhancement up to four times was observed on the tip wall at the highest rotation number. However, heat transfer enhancement is reduced to about 1.5 times with the presence of a tip turning vane at the highest rotation number. Generally, the tip turning vane reduces the effects of rotation, especially in the turn portion.

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References

Han, J. C. , Dutta, S. , and Ekkad, S. , 2012, Gas Turbine Heat Transfer and Cooling Technology, CRC Press, Boca Raton, FL.
Han, J. C. , 1988, “ Heat Transfer and Friction Characteristics in Rectangular Channels With Rib Turbulators,” ASME J. Heat Transfer, 110(2), pp. 321–328. [CrossRef]
Han, J. C. , and Park, J. S. , 1988, “ Developing Heat Transfer in Rectangular Channels With Rib Turbulators,” Int. J. Heat Mass Transfer, 31(1), pp. 183–195. [CrossRef]
Park, J. S. , Han, J. C. , Huang, Y. , and Ou, S. , 1992, “ Heat Transfer Performance Comparisons of Five Different Rectangular Channels With Parallel Angled Ribs,” Int. J. Heat Mass Transfer, 35(11), pp. 2891–2903. [CrossRef]
Wagner, J. H. , Johnson, B. V. , and Hajek, T. J. , 1991, “ Heat Transfer in Rotating Passages With Smooth Walls and Radial Outward Flow,” ASME J. Turbomach., 113(1), pp. 42–51. [CrossRef]
Wagner, J. H. , Johnson, B. V. , and Kooper, F. C. , 1991, “ Heat Transfer in Rotating Passage With Smooth Walls,” ASME J. Turbomach., 113(3), pp. 321–330. [CrossRef]
Han, J. C. , Zhang, Y. M. , and Kalkuehler, K. , 1993, “ Uneven Wall Temperature Effect on Local Heat Transfer in a Rotating Two-Pass Square Channel With Smooth Walls,” ASME J. Heat Transfer, 115(4), pp. 912–920. [CrossRef]
Liu, Y.-H. , Huh, M. , Han, J.-C. , and Chopra, S. , 2008, “ Heat Transfer in a Two-Pass Rectangular Channel (AR = 1:4) Under High Rotation Numbers,” ASME J. Heat Transfer, 130(8), p. 081701. [CrossRef]
Zhou, F. , Lagrone, J. , and Acharya, S. , 2007, “ Internal Cooling in 4:1 AR Passages at High Rotation Numbers,” ASME J. Heat Transfer, 129(12), pp. 1666–1675. [CrossRef]
Huh, M. , Lei, J. , Liu, Y.-H. , and Han, J.-C. , 2010, “ High Rotation Number Effects on Heat Transfer in a Rectangular (AR = 2:1) Two-Pass Channel,” ASME J. Turbomach., 133(2), p. 021001. [CrossRef]
Taslim, M. E. , Bondi, L. A. , and Kercher, D. M. , 1991, “ An Experimental Investigation of Heat Transfer in an Orthogonally Rotating Channel Roughened With 45 Deg Criss-Cross Ribs on Two Opposite Walls,” ASME J. Turbomach., 113(3), pp. 346–353. [CrossRef]
Wagner, J. H. , Johnson, B. V. , Graziani, R. A. , and Yeh, F. C. , 1992, “ Heat Transfer in Rotating Serpentine Passages With Trips Normal to the Flow,” ASME J. Turbomach., 114(4), pp. 847–857. [CrossRef]
Fu, W.-L. , Wright, L. M. , and Han, J.-C. , 2005, “ Heat Transfer in Two-Pass Rotating Rectangular Channels (AR = 1:2 and AR = 1:4) With 45 Deg Angled Rib Turbulators,” ASME J. Turbomach., 127(3), pp. 164–174. [CrossRef]
Fu, W.-L. , Wright, L. M. , and Han, J.-C. , 2006, “ Rotational Buoyancy Effects on Heat Transfer in Five Different Aspect-Ratio Rectangular Channels With Smooth Walls and 45 Degree Ribbed Walls,” ASME J. Heat Transfer, 128(11), pp. 1130–1141. [CrossRef]
Zhou, F. , and Acharya, S. , 2008, “ Heat Transfer at High Rotation Numbers in a Two-Pass 4:1 Aspect Ratio Rectangular Channel With 45 Deg Skewed Ribs,” ASME J. Turbomach., 130(2), p. 021019. [CrossRef]
Han, J. C. , Chandra, P. R. , and Lau, S. C. , 1988, “ Local Heat/Mass Transfer Distributions Around Sharp 180 Deg. Turns in Two-Pass Smooth and Rib-Roughened Channels,” ASME J. Heat Transfer, 110(1), pp. 91–98. [CrossRef]
Schabacker, J. , Bolcs, A. , and Johnson, B. V. , 1998, “ PIV Investigation of the Flow Characteristics in an Internal Coolant Passage With Two Ducts Connected by a Sharp 180 Deg Bend,” ASME Paper No. 98-GT-544.
Son, S. Y. , Kihm, K. D. , and Han, J. C. , 2002, “ PIV Flow Measurements for Heat Transfer Characterization in Two-Pass Square Channels With Smooth and 90° Ribbed Walls,” Int. J. Heat Mass Transfer, 45(24), pp. 4809–4822. [CrossRef]
Cheah, S. C. , Iacovides, H. , Jackson, D. C. , Ji, H. , and Launder, B. E. , 1996, “ LDA Investigation of the Flow Development Through Rotating U-Ducts,” ASME J. Turbomach., 118(3), pp. 590–596. [CrossRef]
Liou, T. M. , and Chen, C. C. , 1999, “ Heat Transfer in a Rotating Two-Pass Smooth Passage With a 180° Rectangular Turn,” Int. J. Heat Mass Transfer, 42(2), pp. 231–247. [CrossRef]
Liou, T.-M. , Tzeng, Y.-Y. , and Chen, C.-C. , 1999, “ Fluid Flow in a 180 Deg Sharp Turning Duct With Different Divider Thicknesses,” ASME J. Turbomach., 121(3), pp. 569–576. [CrossRef]
Saha, K. , and Acharya, S. , 2013, “ Bend Geometries in Internal Cooling Channels for Improved Thermal Performance,” ASME J. Turbomach., 135(3), p. 031028. [CrossRef]
Luo, J. , and Razinsky, E. H. , 2009, “ Analysis of Turbulent Flow in 180 Deg Turning Ducts With and Without Guide Vanes,” ASME J. Turbomach., 131(2), p. 021011. [CrossRef]
Schüler, M. , Zehnder, F. , Weigand, B. , von Wolfersdorf, J. , and Neumann, S. O. , 2010, “ The Effect of Turning Vanes on Pressure Loss and Heat Transfer of a Ribbed Rectangular Two-Pass Internal Cooling Channel,” ASME J. Turbomach., 133(2), p. 021017. [CrossRef]
Chen, W. , Ren, J. , and Jiang, H. , 2011, “ Effect of Turning Vane Configurations on Heat Transfer and Pressure Drop in a Ribbed Internal Cooling System,” ASME J. Turbomach., 133(4), p. 041012. [CrossRef]
Chu, H.-C. , Chen, H.-C. , and Han, J.-C. , 2018, “ Numerical Simulation of Flow and Heat Transfer in Rotating Cooling Passage With Turning Vane in Hub Region,” ASME J Heat Transfer, 140(2), p. 021701. [CrossRef]
Lei, J. , Li, S.-J. , Han, J.-C. , Zhang, L. , and Moon, H.-K. , 2013, “ Heat Transfer in Rotating Multipass Rectangular Ribbed Channel With and Without a Turning Vane,” ASME J. Heat Transfer, 135(4), p. 041903. [CrossRef]
Lei, J. , Li, S.-J. , Han, J.-C. , Zhang, L. , and Moon, H.-K. , 2014, “ Effect of a Turning Vane on Heat Transfer in Rotating Multipass Rectangular Smooth Channel,” J. Thermophys. Heat Transfer, 28(3), pp. 417–427. [CrossRef]
Lei, J. , Su, P. , Xie, G. , and Lorenzini, G. , 2016, “ The Effect of a Hub Turning Vane on Turbulent Flow and Heat Transfer in a Four-Pass Channel at High Rotation Numbers,” Int. J. Heat Mass Transfer, 92, pp. 578–588. [CrossRef]
Wu, H.-W. , Zirakzadeh, H. , Han, J.-C. , Zhang, L. , and Moon, H. K. , 2018, “ Heat Transfer in a Rib and Pin Roughened Rotating Multipass Channel With Hub Turning Vane and Trailing-Edge Slot Ejection,” ASME J. Therm. Sci. Eng. Appl., p. 021011.
Yang, S.-F. , Wu, H.-W. , Han, J.-C. , Zhang, L. , and Moon, H.-K. , 2017, “ Heat Transfer in a Smooth Rotating Multi-Passage Channel With Hub Turning Vane and Trailing-Edge Slot Ejection,” Int. J. Heat Mass Transfer, 109, pp. 1–15. [CrossRef]
Kline, S. J. , and McClintock, F. A. , 1953, “ Describing Uncertainties in a Single Sample Experiment,” Mech. Eng., 75, pp. 3–8.
Huh, M. , Lei, J. , and Han, J. C. , 2012, “ Influence of Channel Orientation on Heat Transfer in a Two-Pass Smooth and Ribbed Rectangular Channel (AR = 2:1) Under Large Rotation Numbers,” ASME J. Turbomach., 134(1), p. 011022. [CrossRef]

Figures

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Fig. 1

Turbine blade external/internal cooling schematic

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Fig. 7

Effect of rotation number on the LS and TS in regions 3 and 5 for (a) without a turning vane and (b) with a turning vane

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Fig. 4

(a) Schematic figure of the test section as viewed from the inlet/outlet plane (hub) and (b) conceptual view of rotation-induced and rib-induced secondary flows

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Fig. 3

(a) Schematic figure of the test section as viewed from the leading side to the TS showing the arrangement of copper plates and the region numbering convention, (b) conceptual view of flows through the ribbed two-pass channel without a turning vane, and (c) with a tip turning vane

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Fig. 2

Schematic figures of: (a) rotating arm assembly used to perform heat transfer experiments and (b) cutaway view of the pressure vessel and the 2:1 aspect ratio test section

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Fig. 5

Temperature distribution of the LS, TS and the bulk air temperature (Re = 15,000, 0 rpm with a turning vane)

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Fig. 8

Effect of rotation number on the LS and TS in regions 6 and 7 for (a) without a turning vane and (b) with a turning vane

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Fig. 9

Effect of rotation number on the tip walls and outer side walls in regions 6 and 7 for (a) without a turning vane and (b) with a turning vane

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Fig. 10

Effect of rotation number on the LS and TS in regions 8 and 10 for (a) without a turning vane and (b) with a turning vane

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Fig. 6

Stream-wise Nu/Nu0 distributions for the LS, TS, outer and inner walls at Re = 15,000 for both with and without vane cases at (a) 0 rpm and (b) 400 rpm

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