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Research Papers

Experimental Measurements and Computational Predictions for an Internally Cooled Simulated Turbine Vane With 90 Degree Rib Turbulators

[+] Author and Article Information
Jason E. Dees, David G. Bogard, Gustavo A. Ledezma, Gregory M. Laskowski

 The University of Texas at Austin, Austin, TX, 78712GE Global Research Center, Niskayuna, NY, 12309

Anil K. Tolpadi

GE Energy, Schenectady, NY 12345

J. Turbomach 134(6), 061005 (Aug 27, 2012) (9 pages) doi:10.1115/1.4006282 History: Received October 06, 2010; Revised May 23, 2011; Published August 27, 2012; Online August 27, 2012

An experimental and computational conjugate heat transfer study of an internally cooled, scaled-up simulated turbine vane with internal rib turbulators was performed. The conjugate nature of the model allowed for the effects of the internal ribs to be seen on the external overall effectiveness distribution. The enhanced internal heat transfer coefficient caused by the ribs increased the cooling capacity of the internal cooling circuit, lowering the overall metal temperature. External surface temperatures, internal surface temperatures, and coolant inlet and exit temperatures were measured and compared to data obtained from a non-ribbed model over a range of internal coolant Reynolds numbers. Internal rib turbulators were found to increase the overall effectiveness on the vane external surface by up to 50% relative to the non-ribbed model. Additionally, comparisons between the experimental measurements and computational predictions are presented.

Copyright © 2012 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

Test airfoil pressure distribution (from Ref. [9])

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Figure 3

Test airfoil schematic

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Figure 4

Schematic of secondary flow loop

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Figure 5

Airfoil with ribs installed

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Figure 6

Computational domains

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Figure 8

Unstructured mesh

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Figure 9

Effect of grid refinement, near wall treatment and cavity inlet velocity boundary condition. Overall effectiveness distribution, suction side, smooth internal wall.

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Figure 10

Effect of grid refinement, near wall treatment and cavity inlet velocity boundary condition. Overall effectiveness distribution, suction side, ribbed internal wall.

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Figure 11

Overall effectiveness distribution, suction side, ribbed and smooth internal wall, Tu = 0.5%

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Figure 12

Overall effectiveness distribution for two spanwise positions on the vane suction side, with ribbed and smooth internal wall, and Re = 20,000

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Figure 13

Overall effectiveness distribution, pressure side, ribbed and smooth internal wall

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Figure 14

Overall effectiveness distribution, Tu = 0.5% and Tu = 20%

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Figure 15

External heat transfer coefficient distributions, Tu = 0.5% and Tu = 20%

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Figure 16

Predicted and measured external heat transfer coefficient distribution, Tu = 20%

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Figure 17

Predicted and measured overall effectiveness, Recoolant  = 20,000, Tu = 0.5%

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Figure 18

Predicted and measured overall effectiveness, Recoolant  = 20,000, Tu = 20%

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