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Research Papers: Combustion and Reactive Flows

Simultaneous Measurement of Three-Dimensional Soot Temperature and Volume Fraction Fields in Axisymmetric or Asymmetric Small Unconfined Flames With CCD Cameras

[+] Author and Article Information
D. Liu

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, People’s Republic of Chinaliudong@zju.edu.cn

Q. X. Huang, F. Wang, Y. Chi, K. F. Cen

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, People’s Republic of China

J. H. Yan1

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, People’s Republic of Chinayanjh@zju.edu.cn

1

Corresponding author.

J. Heat Transfer 132(6), 061202 (Mar 31, 2010) (7 pages) doi:10.1115/1.4000752 History: Received June 10, 2009; Revised October 15, 2009; Published March 31, 2010; Online March 31, 2010

A nonintrusive measurement technique is presented numerically for simultaneous measurement of three-dimensional (3D) soot temperature and volume fraction fields in the axisymmetric or asymmetric flames with charge-coupled device (CCD) cameras. CCD cameras were introduced to capture the flame images for obtaining the line-of-sight radiation intensities. The distributions of local emission source under two wavelengths can be deduced through solving the reconstruction matrix equation by the least-square QR decomposition method from the knowledge of the line-of-sight radiation intensities of the flames. The two-color distributions of the local emission source were used to retrieve the soot temperature and volume fraction distributions. The effects of the discrete ray number of CCD cameras, the number of CCD cameras, and the system signal-to-noise ratio (SNR) on the measurement were investigated. The results show that for accurate measurement of soot volume fraction field, the CCD cameras number should not be less than four and the system SNR can be as low as 54 dB. The proposed technique can be capable for reconstructing the 3D soot temperature and volume fraction fields in both axisymmetric and asymmetric flames well.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
Topics: Temperature , Errors , Flames , Soot
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Figures

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Figure 1

Reconstruction system

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Figure 2

Assumed 3D soot temperature and volume fraction distributions: (a) axisymmetric temperature distribution; (b) axisymmetric volume fraction distribution; (c) asymmetric temperature distribution; and (d) asymmetric volume fraction distribution

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Figure 3

Soot temperature and volume fraction distributions on the cross section k=5 of the flame: (a) axisymmetric temperature distribution; (b) axisymmetric volume fraction distribution; (c) asymmetric temperature distribution; and (d) asymmetric volume fraction distribution

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Figure 4

Effects of different ray numbers on the reconstruction accuracy

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Figure 5

Effects of different combinations of the CCD cameras on the reconstruction accuracy

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Figure 6

Effects of measurement errors on the reconstruction accuracy with 20 samples

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Figure 7

Effects of SNR on the reconstruction accuracy

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Figure 8

Relative errors of reconstruction with different measurement errors

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