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Research Papers

Influence of Unsteady Wake With Trailing Edge Coolant Ejection on Turbine Blade Film Cooling

[+] Author and Article Information
Shiou-Jiuan Li, Akhilesh P. Rallabandi

Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

Je-Chin Han

Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123jc-han@tamu.edu

J. Turbomach 134(6), 061026 (Sep 04, 2012) (9 pages) doi:10.1115/1.4004883 History: Received July 13, 2011; Revised July 25, 2011; Published September 04, 2012; Online September 04, 2012

Detailed film cooling effectiveness distributions along a modeled turbine rotor blade under the combined effects of an upstream trailing edge unsteady wake with coolant ejection are presented using the pressure sensitive paint (PSP) mass transfer analogy method. The experiment is conducted in a low speed wind tunnel facility with a five blade linear cascade. The exit Reynolds number based on the axial chord is 370,000. Unsteady wakes and trailing edge coolant jets are produced by a spoked wheel-type wake generator with hollow rods equipped with several coolant ejections from holes. The coolant-to-mainstream density ratios for both the blade and trailing edge coolant ejection range from 1.5 to 2.0 for simulating realistic engine conditions. Blade blowing ratio studies are 0.5 and 1.0 on the suction surface and 1.0 and 2.0 on the pressure surface. The trailing edge jet blowing ratio and Strouhal numbers are 1.0 and 0.12, respectively. The results show that the unsteady wake reduces the overall film cooling effectiveness. However, the unsteady wake with trailing edge coolant ejection enhances the overall effectiveness. The results also show that the overall filming cooling effectiveness increases by using heavier coolant for trailing edge ejection and for blade surface film cooling.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) and (b) 3D view of suction type wind tunnel with spoke wheel wake generator, and (c) and (d) trailing edge coolant ejection configuration

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Figure 2

View of blade showing the arrangement of cooling holes, coolant supply channels, and area painted with the PSP

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Figure 3

(a) Velocity distribution around the model blade, (b) instantaneous hot-wire velocity signal, (c) ensemble averaged velocity, and (d) ensemble averaged turbulence intensity [15]

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Figure 4

(a) Principle of measurement using PSP, and (b) calibration curve for the PSP at three different temperatures

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Figure 5

Film cooling effectiveness contour plot for lower blowing ratio cases

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Figure 6

Film cooling effectiveness contour plot for higher blowing ratio cases

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Figure 7

Effect of unsteady wake on span-wise averaged effectiveness, DR  = 1.5

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Figure 8

Effect of trailing edge coolant ejection on span-wise averaged effectiveness, DR  = 1.5

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Figure 9

Effect of density ratio on span-wise averaged effectiveness with trailing edge coolant ejection

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Figure 10

Effect of momentum ratio on film cooling effectiveness at six selected location (a)–(c) for the pressure side, and (d)–(f) for the suction side

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