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Research Papers

A Comparative Investigation of Round and Fan-Shaped Cooling Hole Near Flow Fields

[+] Author and Article Information
James S. Porter, Jane E. Sargison, Gregory J. Walker, Alan D. Henderson

School of Engineering, University of Tasmania, Hobart 7001, Australia

J. Turbomach 130(4), 041020 (Aug 04, 2008) (8 pages) doi:10.1115/1.2812952 History: Received June 19, 2007; Revised July 03, 2007; Published August 04, 2008

This study presents velocity and turbulence data measured experimentally in the near field of a round and a laterally expanded fan-shaped cooling hole. Both holes are fed by a plenum inlet, and interact with a turbulent mainstream boundary layer. Flow is Reynolds number matched to engine conditions to preserve flow structure, and two coolant to mainstream blowing momentum ratios are investigated experimentally. Results clearly identify regions of high shear for the round hole as the jet penetrates into the mainstream. In contrast, the distinct lack of high shear regions for the fan-shaped hole points to reasons for improvements in cooling performance noted by previous studies. Two different computational fluid dynamics codes are used to predict the flow within and downstream of the fan-shaped hole, with validation from the experimental measurements. One code is the commercially available ANSYS CFX 10.0 , and the other is the density-based solver with low Mach number preconditioning, HYDRA , developed in-house by Rolls-Royce plc for high speed turbomachinery flows. Good agreement between numerical and experimental data for the center-line traverses was obtained for a steady state solution, and a region of reversed flow within the expansion region of the fan-shaped hole was identified.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Working section and cooling hole with plenum supply

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Figure 2

Hole geometries: (a) round hole and (b) laterally expanded hole

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Figure 3

Contour plot of deviation from pure x-direction flow for the fan-shaped hole. Angle is measured anticlockwise.

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Figure 4

Centerline velocity (a) and turbulence intensity (b) profiles for the round hole geometry

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Figure 5

Centerline velocity (a) and turbulence intensity (b) profiles for the fan-shaped hole geometry

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Figure 6

Comparison of velocity profiles for different hole inlet conditions (round hole)

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Figure 7

Computational mesh (∼500,000 cells)

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Figure 8

Comparison of centerline velocity profiles from experiment, HYDRA , and CFX for fan-shaped hole

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Figure 9

Comparison of centerline turbulence intensity profiles from experiment and CFX for fan-shaped hole

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Figure 11

Near hole region streamlines: (a) HYDRA and (b) CFX

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Figure 10

Comparison of in-hole streamlines for (a) CFX and (b) HYDRA

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