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Research Papers

Effect of Target Wall Curvature on Heat Transfer and Pressure Loss From Jet Array Impingement

[+] Author and Article Information
John Harrington

Center for Advanced Turbomachinery
and Energy Research,
Laboratory for Turbine Aerodynamics,
Heat Transfer and Durability,
University of Central Florida,
2761 Ara Drive,
Orlando, FL 32826
e-mail: joharrington@knights.ucf.edu

Jahed Hossain

Center for Advanced Turbomachinery
and Energy Research,
Laboratory for Turbine Aerodynamics,
Heat Transfer and Durability,
University of Central Florida,
12761 Ara Drive,
Orlando, FL 32826
e-mail: Jahed.hossain@knights.ucf.edu

Wenping Wang

Center for Advanced Turbomachinery
and Energy Research,
Laboratory for Turbine Aerodynamics,
Heat Transfer and Durability,
University of Central Florida,
12761 Ara Drive,
Orlando, FL 32826
e-mail: Wenping.wang@ucf.edu

Jayanta Kapat

Center for Advanced Turbomachinery and
Energy Research,
Laboratory for Turbine Aerodynamics,
Heat Transfer and Durability,
University of Central Florida,
12761 Ara Drive,
Orlando, FL 32826
e-mail: Jayanta.kapat@ucf.edu

Michael Maurer

Ansaldo Energia Switzerland,
Romerstrasse 36 Baden,
Aargau 5401, Switzerland
e-mail: Michaelthomas.maurer@ansaldoenergia.com

Steven Thorpe

Ansaldo Energia Switzerland,
Romerstrasse 36 Baden,
Aargau 5401, Switzerland
e-mail: steven.thorpe@ansaldoenergia.com

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 15, 2016; final manuscript received August 29, 2016; published online January 24, 2017. Editor: Kenneth Hall.

J. Turbomach 139(5), 051004 (Jan 24, 2017) (13 pages) Paper No: TURBO-16-1158; doi: 10.1115/1.4035160 History: Received July 15, 2016; Revised August 29, 2016

Experiments to investigate the effect of target wall curvature on heat transfer and pressure loss from jet array impingement are performed. A jet plate configuration is studied with constant hole diameters and spacings. The geometry of the jet plate has streamwise jet spacings of 5.79 jet diameters, spanwise jet spacings of 4.49 jet diameters, and a jet-to-target plate distance of 3 jet diameters. For the curved case, the radius of the target plate is r/D = 31.57. A flat target wall setup with identical geometric spacing is also tested for direct comparison. Jet spacings were chosen such that validation and comparison can be made with open literature. For all configurations, spent air is drawn out in a single direction, which is tangential to the target plate curvature. Average jet Reynolds numbers ranging from 55,000 to 125,000 are tested. A steady-state measurement technique utilizing temperature-sensitive paint (TSP) is used on the target surface to obtain Nusselt number distributions. Pressure taps placed on the sidewall of the channel are used to evaluate the flow distribution in the impingement channel. Alongside the experimental work, CFD was performed utilizing the v2 − f turbulence model to better understand the relationship between the flow field and the heat transfer on the target surface. The main target of the current study is to quantify the impact of target wall radius and the decay of heat transfer after the impingement section, and to check the open literature correlations. It was found that the target wall curvature did not cause any significant changes in either the flow distribution or the heat transfer level. Comparisons with established correlations show similar level but different trends in heat transfer, potentially caused by differences in L/D. CFD results were able to show agreement in streamwise pitch-averaged Nusselt number levels with experimental results for the curved target plate at higher Re numbers.

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References

Figures

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Fig. 1

Definitions of different crossflow schemes [8]

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Fig. 2

Test section cross-sectional view of (a) curved configuration and (b) plane configuration

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Fig. 3

(a) Detailed side view of curved configuration. (b) Detailed side view of plane configuration. (c) Detailed streamwise-oriented view. (d) composite view normal to jet plate.

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Fig. 4

Side view of computational domain

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Fig. 5

Side view of grid over jet and target plate

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Fig. 6

Top view of grid over target plate

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Fig. 7

Grid on midplane of jet at target plate

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Fig. 8

Experimental local Gj/Gjavg and Gc/Gj distribution for curved case

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Fig. 9

Experimental local Gj/Gjavg and Gc/Gj distribution for plane case

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Fig. 10

Array-average discharge coefficients for curved and plane case

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Fig. 11

First row jets velocity vectors on y–z plane at (a) iteration = #140,000, (b) iteration = #141,000, (c) iteration = #142,000, and (d) iteration = #143,000, Re = 55,000 curved case

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Fig. 12

Top view of first row jets velocity at potential core region on s–y plane between jet and target plates at z/D = 2.64, at (a) iteration = #140,000, (b) iteration = #141,000, (c) iteration = #142,000 and (d) iteration = #143,000, Re = 55,000 curved case

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Fig. 13

Mean pressure on target plate comparison between (a) RANS and (b) uRANS, Re = 55,000, curved case. (c) Grid convergence study using area-averaged Nusselt number.

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Fig. 14

Standard deviation of pressure on target plate averaged over 15,000 iterations; Re = 55,000 curved case

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Fig. 15

Nusselt number profiles for curved configuration

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Fig. 16

Nusselt number profiles for plane configuration

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Fig. 17

Laterally averaged Nusselt numbers for curved case

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Fig. 18

Laterally averaged Nusselt numbers for plane case

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Fig. 19

Row-averaged Nusselt number comparisons

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Fig. 20

Computational results of Nusselt number profiles for curved case

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Fig. 21

Computational and experimental results of laterally averaged Nusselt numbers for curved case

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Fig. 22

Computational and experimental results of laterally averaged Nusselt numbers for curved case

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