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Research Papers

Superposition Predictions of the Reduction of Hot Streaks by Coolant From a Film-Cooled Guide Vane

[+] Author and Article Information
Sean C. Jenkins

Mechanical Engineering Department, The University of Texas at Austin, Austin, TX 78712sjenkins@mail.utexas.edu

David G. Bogard

Mechanical Engineering Department, The University of Texas at Austin, Austin, TX 78712dbogard@mail.utexas.edu

J. Turbomach 131(4), 041002 (Jun 30, 2009) (9 pages) doi:10.1115/1.2948964 History: Received September 26, 2006; Revised August 03, 2007; Published June 30, 2009

The turbine section of a gas turbine engine is subjected to hot gases flowing from the combustor that typically have high temperature regions known as “hot streaks.” These hot streaks pass through the nozzle guide vanes, either impacting the vanes or passing through the passages between vanes. Generally the vanes are highly film cooled, and the coolant from the vanes interacts with the hot streak resulting in a reduction of the hot streak temperature. In this study, predictions of the reduction of hot streaks were made using superposition of measured temperature distributions due to coolant injection and measured temperature distributions of hot streaks. These predictions were compared to the measured hot streak reduction to determine the accuracy of the superposition technique. Results showed that the superposition predictions generally underpredicted the reduction of the peak hot streak temperature, but were within at least 20% of the peak temperature value. The superposition technique was also found to be useful for determining the hot streak reduction for different hot streak locations, and different coolant and hot streak operating conditions.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Simulated vane cascade with hot streak generator

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Figure 2

Schematic of film cooling hole configuration

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Figure 3

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50) for the hot streak at the stagnation line with showerhead blowing at M*=1.6 and high mainstream turbulence (Tu=20%)

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Figure 4

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50) for the hot streak at the stagnation line with suction side blowing at Mav=0.7 and high mainstream turbulence (Tu=20%)

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Figure 8

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50) for the hot streak at the stagnation line with full coverage blowing at high blowing ratios (M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0) at a density ratio of DR=1.2 and high mainstream turbulence (Tu=20%)

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Figure 9

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50) for the hot streak at the stagnation line with full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0, low mainstream turbulence (Tu=3.5%)

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Figure 14

Prediction of coolant profile including coolant from adjacent vanes for full coverage at high blowing ratios (M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0) and high mainstream turbulence (Tu=20%)

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Figure 18

Peak hot streak temperature ratio (ΘR) predictions versus hot streak pitch position at Position T for full coverage film cooling at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0, including adjacent vane overlap predictions

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Figure 19

Peak hot streak temperature ratio (ΘR) predictions vs hot streak pitch position at Position B for full coverage film cooling at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0

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Figure 20

Comparison of normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50) for the hot streak at a simulated temperature ratio of T∕T∞=1.5 at the stagnation line without cooling and with full coverage blowing at a simulated coolant density ratio of DR=2.0 at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0 and high mainstream turbulence (Tu=20%)

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Figure 5

Comparison of experimental and superposition prediction normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50), for the hot streak at the stagnation line with full coverage blowing and high mainstream turbulence (Tu=20%) at (a) standard blowing ratios (M*showerhead=1.6, Mav,suction=0.7, and Mav,pressure=0.6) and (b) high blowing ratios (M*showerhead=2.0, Mav,suction=1.0, and Mavg,pressure=1.0)

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Figure 6

Normalized temperature ratio (ΘR) contours at Position T with the hot streak at the stagnation line and high mainstream turbulence (Tu=20%) with (a) no coolant, (b) superposition prediction of full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0, and (c) measured values for full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0

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Figure 12

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles in the wake at Position B at midspan (z∕S=0.50) for the hot streak at the stagnation line with full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0 and high mainstream turbulence (Tu=20%)

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Figure 7

Comparison of measured coolant temperature (ΘR) profiles at Position T at midspan (z∕S=0.50) for full coverage film cooling at high blowing ratios (M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0) and superposition of individual region coolant temperature (ΘR) profiles at the same blowing ratios and high mainstream turbulence (Tu=20%)

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Figure 10

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position B at midspan (z∕S=0.50) for the hot streak at the stagnation line with showerhead blowing at M*=2.0 and high mainstream turbulence (Tu=20%)

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Figure 11

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position B at midspan (z∕S=0.50) for the hot streak at the stagnation line with suction side blowing at Mav=1.0 and high mainstream turbulence (Tu=20%)

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Figure 13

Normalized temperature ratio (ΘR) contours in the wake at Position B with the hot streak at the stagnation line and high mainstream turbulence (Tu=20%) with (a) no coolant, (b) superposition prediction of full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0, and (c) measured values for full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0

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Figure 15

Comparison of experimental and superposition normalized temperature ratio (ΘR) profiles at Position T at midspan (z∕S=0.50) for the hot streak at the stagnation line with full coverage blowing at (M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0), high mainstream turbulence (Tu=20%) including a prediction for the reduction with coolant from adjacent vanes

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Figure 17

Comparison of normalized temperature ratio (ΘR) profiles at Position T for pitch positions of 0.0P (base line) and +0.043P (ideal) without coolant (measured) and with full coverage blowing at M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0 (predicted)

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Figure 16

Prediction of coolant profile including coolant from adjacent vanes for full coverage at high blowing ratios (M*showerhead=2.0, Mav,suction=1.0, and Mav,pressure=1.0) at Position B and high mainstream turbulence (Tu=20%)

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