Research Papers

Heat Transfer Measurements in an Internal Cooling System Using a Transient Technique With Infrared Thermography

[+] Author and Article Information
Christian Egger

e-mail: christian.egger@itlr.uni-stuttgart.de

Jens von Wolfersdorf

Institute of Aerospace Thermodynamics (ITLR),
University of Stuttgart,
Pfaffenwaldring 31,
D-70569 Stuttgart, Germany

Martin Schnieder

Baden, CH-5401, Switzerland

1Corresponding author.

Contributed by the International Gas Turbine Institute of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 3, 2012; final manuscript received August 27, 2012; published online June 5, 2013. Assoc. Editor: David Wisler.

J. Turbomach 135(4), 041012 (Jun 05, 2013) (8 pages) Paper No: TURBO-12-1122; doi: 10.1115/1.4007625 History: Received July 03, 2012; Revised August 27, 2012

In this paper, a transient method for measuring heat transfer coefficients in internal cooling systems using infrared thermography is applied. The experiments are performed with a two-pass internal cooling channel connected by a 180deg bend. The leading edge and the trailing edge consist of trapezoidal and nearly rectangular cross-sections, respectively, to achieve an engine-similar configuration. Within the channels, rib arrangements are considered for heat transfer enhancement. The test model is made of metallic material. During the experiment, the cooling channels are heated by the internal flow. The surface temperature response of the cooling channel walls is measured on the outer surface by infrared thermography. Additionally, fluid temperatures as well as fluid and solid properties are determined for the data analysis. The method for determining the distribution of internal heat transfer coefficients is based on a lumped capacitance approach, which considers lateral conduction in the cooling system walls as well as natural convection and radiation heat transfer on the outer surface. Because of time-dependent effects, a sensitivity analysis is performed to identify optimal time periods for data analysis. Results are compared with available literature data.

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Fig. 1

Experimental facility

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Fig. 2

Schematic depiction of the reference geometry

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Fig. 3

Distribution of the inlet temperatures for two different heating situations

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Fig. 4

Temperature distributions on outer surface for different points in time measured by infrared camera

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Fig. 5

Schematic of the occurring heat flows

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Fig. 6

Sensitivity coefficients for inlet and outlet channel at different points

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Fig. 7

Nusselt number distribution for lumped capacitance model (V1) (a). Results from TLC experiment [20] (b).

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Fig. 8

Segment-wise area-averaged Nusselt numbers

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Fig. 9

Nusselt number distributions evaluated with different time periods (V2)

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Fig. 10

Nusselt number distributions for lumped capacitance model with lateral conduction effects for two different inlet temperatures

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Fig. 11

Heat flows for Pos. 2

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Fig. 12

Wall temperature distributions for Pos. 2

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Fig. 13

Heat flows for Pos. 4

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Fig. 14

Wall temperature distributions for Pos. 4

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Fig. 15

Nusselt number distribution evaluated with lumped capacitance model without lateral conduction effects



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