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Research Papers: Experimental Techniques

Temperature Measurements of Diesel Fuel Combustion With Multicolor Pyrometry

[+] Author and Article Information
Tairan Fu1

Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, P. R. Chinatrfu@mail.tsinghua.edu.cn

Zhe Wang

Department of Thermal Engineering, State Key Laboratory of Power Systems, Tsinghua University, Beijing 100084, P. R. China

Xiaofang Cheng

Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, P. R. China

1

Corresponding author.

J. Heat Transfer 132(5), 051602 (Mar 09, 2010) (7 pages) doi:10.1115/1.4000467 History: Received May 20, 2009; Revised August 27, 2009; Published March 09, 2010; Online March 09, 2010

Optical diagnostics techniques to measure diesel combustion flame temperatures are useful for evaluation and control of combustion processes. In this paper, diesel combustion flame temperatures are measured based on a multicolor pyrometry method respectively adopting an optical fiber spectrometer and a color charge coupled device (CCD). The intensity ratios for various wavelengths/wavebands are utilized as the analytical variables to deduce the temperatures to avoid the need to calibrate each system for the specific geometry conditions. The measured multicolor data can determine the temperature T and the soot factor KL. Extra data collected at many wavelengths is used to reduce the noise and random fluctuations in the measurements. To improve the solving precision, a data-processing method based on the least-squares technique is proposed to fit the data for approximate solutions. Verification experiments using the multicolor pyrometry were conducted in a 54–120 kW test furnace with diesel fuel. Data for 16 wavelengths detected by a fiber optic spectrometer from a diesel flame is analyzed to determine how to choose a suitable combination of three wavelengths for three-color pyrometry. The CCD-based three-color measurements, which would be much more practical in field measurements, are compared with the spectrometer-based results.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Distribution of (T,KL) in the measurement coordinates (M1,2,M1,3)

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Figure 2

Diesel fuel test furnace

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Figure 3

Spectral radiation intensities at 16 wavelengths

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Figure 4

Relative temperature errors

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Figure 5

Relative soot factor errors

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Figure 6

Three-wavelength combinations

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Figure 7

Ratios of calibration coefficients at different temperatures

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Figure 8

Original diesel flame image and calculated temperature distributions (from left to right) for an exposure time of 100 μs

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