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Research Papers: Experimental Techniques

Subpixel Temperature Measurements in Plasma Jet Environments Using High-Speed Multispectral Pyrometry

[+] Author and Article Information
Tairan Fu

Key Laboratory for Thermal Science and
Power Engineering of Ministry of Education,
Beijing Key Laboratory of CO2 Utilization
and Reduction Technology,
Department of Energy and Power Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: trfu@mail.tsinghua.edu.cn

Jiangfan Liu, Minghao Duan

Key Laboratory for Thermal Science and
Power Engineering of Ministry of Education,
Beijing Key Laboratory of CO2 Utilization
and Reduction Technology,
Department of Energy and Power Engineering,
Tsinghua University,
Beijing 100084, China

Sen Li

State Key Laboratory of High
Temperature Gas Dynamics,
Institute of Mechanics,
Chinese Academy of Sciences,
Beijing 100190, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 7, 2017; final manuscript received October 22, 2017; published online April 6, 2018. Assoc. Editor: Thomas Beechem.

J. Heat Transfer 140(7), 071601 (Apr 06, 2018) (7 pages) Paper No: HT-17-1127; doi: 10.1115/1.4038874 History: Received March 07, 2017; Revised October 22, 2017

A high-speed (2 kHz) near-infrared (1.0–1.65 μm) multispectral pyrometer was used for noninvasive measurements of the subpixel temperature distribution near the sharp leading edge of a wing exposed to a supersonic plasma jet. The multispectral pyrometer operating in the field measurement mode was able to measure the spatial temperature distribution. Multiple spectra were used to determine the temperature distributions in the measurement region. The spatial resolution of the multispectral pyrometer was not restricted to one “pixel” but was extended to subpixel accuracy (the temperature distribution inside one pixel in the image space corresponding to the point region in the object space). Thus, this system gives high-speed, multichannel, and long working time spatial temperature measurements with a small data stream from high-speed multispectral pyrometers. The temperature distribution of the leading edge of a ceramic wing was investigated with the leading edge exposed to extreme convective heating from a high-enthalpy plasma flow. Simultaneous measurements with a multispectral pyrometer and an imaging pyrometer verify the measurement accuracy of the subpixel temperature distribution. Thus, this multispectral pyrometry can provide in situ noninvasive temperature diagnostics in supersonic plasma jet environments.

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Figures

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Fig. 3

Experimental model and the 65 mm diameter temperature measurement region

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Fig. 4

Spectral radiation intensities in the measurement region for wavelengths of 1.0–1.6 μm at various times

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Fig. 2

Sketch of the experimental system to measure temperatures in plasma aerodynamic environments

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Fig. 1

Temperature measurement modes of a multispectral pyrometer

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Fig. 5

Calculated weighted surface temperatures given by the traditional multispectral pyrometry measurement mode

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Fig. 6

Temperature area fraction distributions at 100 s and 200 s of the measurement region

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Fig. 7

Measured thermal image (a) of the model surface at high temperatures and pseudo-color results of temperature distributions on the model surface obtained by the imaging pyrometer at 100 s (b) and 200 s (c)

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Fig. 8

Subpixel temperature area fraction distributions at 100 s and 200 s from the multispectral pyrometer and imaging pyrometer results

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