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Research Papers

Time-Resolved Heat Transfer Measurements on the Tip Wall of a Ribbed Channel Using a Novel Heat Flux Sensor—Part I: Sensor and Benchmarks

[+] Author and Article Information
Tim Roediger1

Institute of Aerodynamics and Gas Dynamics (IAG), University of Stuttgart, Pfaffenwaldring 21, Stuttgart, Germany 70569roediger@iag.uni-stuttgart.de

Helmut Knauss, Uwe Gaisbauer, Ewald Kraemer

Institute of Aerodynamics and Gas Dynamics (IAG), University of Stuttgart, Pfaffenwaldring 21, Stuttgart, Germany 70569

Sean Jenkins, Jens von Wolfersdorf

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

1

Corresponding author.

J. Turbomach 130(1), 011018 (Jan 28, 2008) (8 pages) doi:10.1115/1.2751141 History: Received July 17, 2006; Revised September 25, 2006; Published January 28, 2008

A novel heat flux sensor was tested that allows for time-resolved heat flux measurements in internal ribbed channels related to the study of passages in gas turbine blades. The working principle of the atomic layer thermopile (ALTP) sensor is based on a thermoelectric field created by a temperature gradient over an yttrium-barium-copper-oxide (YBCO) crystal (the transverse Seebeck effect). The sensors very fast frequency response allows for highly time-resolved heat flux measurements up to the 1MHz range. This paper explains the design and working principle of the sensor, as well as the benchmarking of the sensor for several flow conditions. For internal cooling passages, this novel sensor allows for highly accurate, time-resolved measurements of heat transfer coefficients, leading to a greater understanding of the influence of fluctuations in temperature fields.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic cross section of a tilted YBCO film (12)

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Figure 2

Schematic cross section of the sensor module

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Figure 3

Scheme of calibration setup

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Figure 4

Time signal of ALTP and reference detector

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Figure 5

Calibration curve for continuous and pulsed laser sources

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Figure 6

ALTP signal and monitor diode reference for a 50kHz modulated laser signal

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Figure 7

Amplitude-frequency response for ALTP without protective coating

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Figure 8

Location of probes in SWK

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Figure 9

(a) Time signal of FMP, (b) FMP signal after its integration, and (c) time signal of ALTP

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Figure 10

(a) Measured heat flux densities for ALTP1 and 2, FMP and theory versus runs, (b) ratio r=(qALTP−qFMP)∕[(qALTP+qFMP)∕2] of measured heat flux densities by the different sensors

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Figure 11

Schematic working principle of the channel

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Figure 12

Heat transfer coefficient distribution measured by TLC for Re=100,000

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