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Research Papers

A Novel Measuring Technique Utilizing Temperature Sensitive Paint—Measurement Procedure, Validation, Application, and Comparison With Infrared Thermography

[+] Author and Article Information
M. Lorenz

e-mail: marco.lorenz@kit.edu

T. Horbach

e-mail: tim.horbach@kit.edu

A. Schulz

e-mail: achmed.schulz@kit.edu

H.-J. Bauer

e-mail: hans-joerg.bauer@kit.edu
Institut für Thermische Strömungsmaschinen,
Karlsruhe Institute of Technology (KIT),
Kaiserstraße 12, 76131 Karlsruhe, Germany

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received February 22, 2011; final manuscript received December 5, 2011; published online March 25, 2013. Assoc. Editor: Wing Ng.

J. Turbomach 135(3), 031003 (Mar 25, 2013) (10 pages) Paper No: TURBO-11-1022; doi: 10.1115/1.4006638 History: Received February 22, 2011; Revised December 05, 2011

A novel method for surface temperature measurement using temperature sensitive paint (TSP) is presented. Precalibration of the TSP is shown and a semi in situ calibration technique using thermocouples is provided for high accuracy measurement. The method presented is applied to a film cooling experiment with a maximum surface temperature of 430 K and compared to highly reliable infrared thermography measurements that serve as benchmark results. The in situ calibration technique shows a maximum deviation of 0.5 K from the thermocouple readings. The comparison of laterally averaged temperature distributions of TSP and infrared measurement shows excellent agreement.

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Figures

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Fig. 3

Experimental setup for precalibration

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Fig. 2

Absorption and emissions spectra of rhodamine B [34]

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Fig. 1

Jablonsky energy-level diagram [27]

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Fig. 4

Precalibration of the TSP over temperature

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Fig. 8

Experimental setup for the aerothermal investigation of advanced trailing edge cooling designs

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Fig. 5

Pressure dependency

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Fig. 6

Illustration of shift correction

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Fig. 7

Combined cross correlation coefficient (Eq. (19))

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Fig. 9

In situ calibration for the TSP measurement

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Fig. 10

Comparison of temperature distributions for M = 0.5

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Fig. 11

Comparison of laterally averaged temperature distributions

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