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TECHNICAL PAPERS

High-Resolution Film Cooling Effectiveness Measurements of Axial Holes Embedded in a Transverse Trench With Various Trench Configurations

[+] Author and Article Information
Scot K. Waye

Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712scotwaye@hotmail.com

David G. Bogard

Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712

J. Turbomach 129(2), 294-302 (Jul 14, 2006) (9 pages) doi:10.1115/1.2464141 History: Received July 12, 2006; Revised July 14, 2006

Adiabatic film cooling effectiveness of axial holes embedded within a transverse trench on the suction side of a turbine vane was investigated. High-resolution two-dimensional data obtained from infrared thermography and corrected for local conduction provided spatial adiabatic effectiveness data. Flow parameters of blowing ratio, density ratio, and turbulence intensity were independently varied. In addition to a baseline geometry, nine trench configurations were tested, all with a depth of 12 hole diameter, with varying widths, and with perpendicular and inclined trench walls. A perpendicular trench wall at the very downstream edge of the coolant hole was found to be the key trench characteristic that yielded much improved adiabatic effectiveness performance. This configuration increased adiabatic effectiveness up to 100% near the hole and 40% downstream. All other trench configurations had little effect on the adiabatic effectiveness. Thermal field measurements confirmed that the improved adiabatic effectiveness that occurred for a narrow trench with perpendicular walls was due to a lateral spreading of the coolant and reduced coolant jet separation. The cooling levels exhibited by these particular geometries are comparable to shaped holes, but much easier and cheaper to manufacture.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of the simulated turbine vane test section

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Figure 2

Schematic of test vane details

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Figure 3

Coordinate origin for trench configurations

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Figure 4

Trench lip configurations

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Figure 5

Validation of baseline axial holes with literature

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Figure 6

Comparison of laterally averaged adiabatic effectiveness for trench lip configurations, M=1.0, Tu∞=1.0%

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Figure 7

Spatial plots of adiabatic effectiveness for trench configurations, M=1.0, Tu∞=1.0%

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Figure 8

Laterally averaged adiabatic effectiveness for narrow trench (configuration 2) for various M, Tu∞=1.0%

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Figure 9

Density ratio comparison for narrow trench configuration

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Figure 10

Spatial plots of adiabatic effectiveness for the narrow trench (configuration 2) at various M, Tu∞=3.9%

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Figure 11

Comparison of the narrow trench (configuration 2) and baseline axial holes, Tu∞=3.9%

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Figure 12

Comparison of spatially averaged adiabatic effectiveness for axial and trench configurations

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Figure 13

Laterally averaged adiabatic effectiveness for wide trench (configuration 10), Tu∞=3.9%

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Figure 14

Spatial plots of adiabatic effectiveness for wide trench configuration at various M, Tu∞=3.9%

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Figure 15

Comparison of wide trench configuration and baseline axial holes, Tu∞=3.9%

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Figure 16

Thermal profiles for: (a) axial hole, and (b) narrow trench configurations, x∕d=2, M=1.0, Tu∞=1.0%

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Figure 17

Laterally averaged adiabatic effectiveness near the hole, Tu∞=1.0%

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Figure 18

Thermal profiles within the trench at: x∕d=(a) −2.5, (b) −2.0, and (c) −1.5, M=1.0, Tu∞=1.0%

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Figure 19

Comparison of axial holes, shaped holes, and axial holes embedded within a narrow trench

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