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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Development of Low-Drift Nickel-Based Thermocouples for High-Temperature Applications

[+] Author and Article Information
Michele Scervini

Mem. ASME
Department of Materials Science and Metallurgy,
University of Cambridge,
27 Charles Babbage Road,
Cambridge CB3 0FS, UK
e-mail: ms737@cam.ac.uk

1Corresponding author.

Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 20, 2015; final manuscript received December 29, 2015; published online March 15, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(8), 081601 (Mar 15, 2016) (8 pages) Paper No: GTP-15-1536; doi: 10.1115/1.4032646 History: Received November 20, 2015; Revised December 29, 2015

Recent progress on the new nickel-based thermocouples for high-temperature applications developed at the Department of Materials Science and Metallurgy in the University of Cambridge is described in this paper. Isothermal drift at temperatures above 1000 °C as a function of the thermocouple diameter has been studied for both conventional nickel-based thermocouples and the new nickel-based thermocouple. The new nickel-based thermocouple experiences a much reduced drift compared to conventional sensors. Tests in thermal cyclic conditions have been undertaken on conventional and new nickel-based thermocouples, showing a clear improvement for the new sensors at temperatures both higher and lower than 1000 °C. The improvements achievable with the new nickel-based thermocouple in both isothermal and thermal cycling conditions suggest that the new sensor can be used at high temperatures, where current conventional sensors are not reliable, as well as at temperatures lower than 1000 °C with improved performance compared to the conventional sensors.

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Copyright © 2016 by ASME
Topics: Thermocouples
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References

Figures

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Fig. 1

MIMS configuration: schematic longitudinal and cross sections

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Fig. 2

A graphical representation of the effective life of thermocouples

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Fig. 3

A cross section diagram of the double-wall configuration

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Fig. 4

Drift of conventional type N Inconel 600 sheathed thermocouples having 3 mm, 2 mm, and 1.5 mm outer diameters at 1000 °C, 1100 °C, and 1200 °C, respectively

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Fig. 5

Drift of conventional type N Inconel 600 sheathed thermocouples and double-wall type N thermocouples at 1100 °C

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Fig. 6

Drift of conventional type N Inconel 600 sheathed thermocouples and double-wall type N thermocouples at 1200 °C

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Fig. 7

Drift of conventional type N Inconel 600 sheathed thermocouples and double-wall type N thermocouples at 1300 °C

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Fig. 8

Effect of thermal cycling on conventional type N thermocouples and double-wall type N thermocouples at 1250 °C

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Fig. 9

Effect of thermal cycling on conventional type N thermocouples and double-wall type N thermocouples at 650 °C

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Fig. 10

The 4.6 mm outer diameter double-wall type N thermocouple and the conventional 1.5 mm outer diameter conventional type K thermocouple mounted on the traverse of the hot gas test rig facility at the TU Dresden

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Fig. 11

Temperature profile experienced by the double-wall type N thermocouple and the conventional type K thermocouple in the hot gas test rig facility at the TU Dresden

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Fig. 12

X-ray imaging of the longitudinal cross section of the 4.6 mm outer diameter type N double-wall thermocouple in the as-manufactured conditions (a) and after test in the hot gas test rig facility at the TU Dresden (b)

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