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Research Papers

Flowfield Measurements in a Single Row of Low Aspect Ratio Pin Fins

[+] Author and Article Information
Jason K. Ostanek1

Mechanical and Nuclear Engineering Department,  Pennsylvania State University, University Park, PA 16803jostanek@psu.edu

Karen A. Thole

Mechanical and Nuclear Engineering Department,  Pennsylvania State University, University Park, PA 16803kthole@engr.psu.edu

1

Corresponding author.

J. Turbomach 134(5), 051034 (May 31, 2012) (10 pages) doi:10.1115/1.4004755 History: Received July 18, 2011; Accepted July 27, 2011; Published May 31, 2012; Online May 31, 2012

Pin-fin arrays are commonly used as compact heat exchangers for cooling the trailing edge of gas turbine airfoils. While much research has been devoted to the heat transfer characteristics of various pin-fin configurations, little work has been done to investigate the flowfield in pin-fin arrays. Such information may allow for further optimization of pin-fin configurations. A new pin-fin facility at large scale has been constructed to allow optical access for the use of nonintrusive measurement techniques such as laser Doppler velocimetry and time-resolved, digital particle image velocimetry. Using these techniques, the flow through a single row of pin fins having a height-to-diameter ratio of 2 and span-to-diameter ratio of 2.5 was investigated. Results showed that the length of the wake region decreased with increasing Reynolds number. At higher Reynolds numbers, Kármán vortices developed closer to the pin fins than for single, infinitely long cylinders. Transverse fluctuations correlated well with endwall heat transfer indicating that the Kármán vortices play a key role in energy transport.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of test facility, schematic of measurement planes, and summary of spatial resolution

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Figure 2

U+ versus Z+ measured using LDV at various Reynolds numbers in unobstructed duct

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Figure 3

u′+ versus Z+ measured using LDV at various Reynolds numbers in unobstructed duct [18]

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Figure 4

Comparison of U/Umax measured with TRDPIV and LDV at X/D = 1.6 and Z/H = 0

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Figure 5

Comparison of u′/Umax measured with TRDPIV and LDV at X/D = 1.6 and Z/H = 0

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Figure 6

Features of the horseshoe vortex system at the cylindrical leading edge [19]

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Figure 7

Mean streamwise velocity contours, streamtraces, and location of peak swirl strength (dashed lines) taken in the stagnation plane

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Figure 8

Normalized turbulent kinetic energy contours taken in the stagnation plane

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Figure 9

Instantaneous contours of normalized streamwise velocity and instantaneous streamtraces showing the HV system at ReD  = 3.0 × 103

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Figure 10

Instantaneous contours of normalized streamwise velocity and instantaneous streamtraces showing the HV system at ReD  = 20 × 103

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Figure 11

Midline Cp versus θ at ReD  = 3.0 × 103 [22-23]

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Figure 12

Midline Cp versus θ at ReD  = 20 × 103 [22-23]

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Figure 13

Mean streamwise velocity and streamtraces behind the pin fin at the channel centerline

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Figure 14

Formation length versus Re for the present study (single-row, H/D = 2, S/D = 2.5) and for single, infinitely long cylinders [(7),25-27]

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Figure 15

Instantaneous streamtraces at ReD  = 3.0 × 103 where the images are taken 0.10 shedding cycles apart

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Figure 16

Instantaneous streamtraces at ReD  = 20 × 103 where the images are taken 0.11 shedding cycles apart

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Figure 17

Streamwise fluctuation augmentation and endwall heat transfer augmentation [7]

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Figure 18

Transverse fluctuation augmentation and endwall heat transfer augmentation [7]

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Figure 19

Mean endwall heat transfer contours in a multirow pin-fin array (H/D = 2, S/D = X/D = 2.5) [6]

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