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Research Papers

Determination of a Local Bulk Temperature Based Heat Transfer Coefficient for the Wetted Surfaces in a Single Inline Row Impingement Channel

[+] Author and Article Information
Mark Ricklick

Laboratory for Turbine Heat Transfer and Aerodynamics, Center for Advanced Turbines and Energy Research, University of Central Florida, Orlando, FL 32826mricklic@mail.ucf.edu

J. S. Kapat

Laboratory for Turbine Heat Transfer and Aerodynamics, Center for Advanced Turbines and Energy Research, University of Central Florida, Orlando, FL 32826

J. Turbomach 133(3), 031008 (Nov 12, 2010) (10 pages) doi:10.1115/1.4001227 History: Received August 10, 2009; Revised October 08, 2009; Published November 12, 2010; Online November 12, 2010

High performance turbine airfoils are typically cooled with a combination of internal cooling channels and impingement. In such applications, the jets impinge against a target surface, and then exit along the channel formed by the jet plate, target plate, and side walls. Local convection coefficients are the result of both the jet impact, as well as the channel flow produced from the exiting jets. Numerous studies have explored the effects of jet array and channel configurations on both target and jet plate heat transfer coefficients. However, most current studies use the plenum temperature as the reference temperature in heat transfer calculations. This presents some difficulty to designers who need to determine heat transfer rates based on the local bulk temperatures. This paper examines three different methods to determining the local bulk temperature in a steady state impingement channel heat transfer experiment. The various methods will be compared based on their ease of application as well as their accuracy in describing the results. One method proves to be the most accurate, while another proves to be more easily implemented. The methods are compared for a single case previously studied, on a 15 hole, single row impingement channel, with dimensions of X/D=5, Y/D=4, Z/D=1 and 3, and an average jet based Reynolds number of 17,000 and 45,000. Effects due to the choice of the reference temperature in heat transfer calculations are shown to cause significant variations in the calculated heat transfer coefficients. These results point to a transition between different flow regimes in the post-impingement flow.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Standard steady state energy balance

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Figure 2

Impingement energy balance

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Figure 3

Impingement channel design

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Figure 5

Validation spanwise averaged results

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Figure 6

Gj/Gj avg comparison of experimental data and model by Florschuetz (1)

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Figure 7

Gc/Gj comparison of experimental data and model by Florschuetz (1)

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Figure 8

Local jet Reynolds number

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Figure 9

Reference temperature trends—Z/D=1

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Figure 10

Reference temperature trends—Z/D=3

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Figure 11

Target wall HTC trends—Z/D=1

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Figure 12

Side wall HTC trends—Z/D=1

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Figure 13

Target wall HTC trends—Z/D=3

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Figure 14

Side wall HTC trends—Z/D=3

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