Correlation of measurements OH*, CH*, C2* and H2O with changing signal of Electrical Capacitance Tomography system in the reaction zone of methane/air premixed flames
Abstract
Research into the application of Electrical Capacitance Tomography (ECT) carried out in the Laboratory of the Aircraft Engines Division at Warsaw University of Technology has shown that it is applicable to recognition of various flames. Several cases were tested using the ECT system and the system successfully created cross sectional images of premixed and diffusion flames. Studies were then conducted which significantly increased the functionality of the system.This article describes experimental studies that afforded insight into the effects of the degree of ionization generated during the combustion process on the changing signal of the ECT system. Research was carried out in an experimental stand consisting of a burner, 6 and 12 electrodes capacitance sensors and an optical spectrometer. Burner injection was used to obtain stability of combustion. Two rotameters were installed in the inlet of the burner. The flow rate of air and methane was used to determine the composition of the combustible mixture formed in the mixing chamber. A grating spectrometer was used to perform a detailed analysis of combustion processes and to detect various types radicals. This experimental test focused on measuring chemiluminescence intensities and possible correlations of the OH*, CH*, C2* and H2O with air/methane ratio. The data from the ECT system and optical spectrometer was then analyzed. It was found that the strong correlations between the peak intensity of OH*, CH*, C2* and H2O in the reaction zone to the equivalence ratio could be used to investigate the local flame stoichiometry.References
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Instruments, 10.
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in Conical Flames by Laser Interferometry. Com-
bustion Science and Technology, 12.
3.Seitzman, J.M., Kychako, G., and Hanson, R.K.
(1985) Instantaneous temperature eld measurements
using planar laser-induced
uorescence.. Opt Lett,
10, 439{41.
4.Blizard, N., and Keck, J. (1974) Experimental and
Theoretical Investigation of Turbulent Burning Model
for Internal Combustion Engines. SAE Technical Pa-
per 740191.
5.Yoshiyama, S., and Tomita, E. (2002) Combustion
Diagnostics of a Spark Ignition Engine Using a Spark
Plug as an Ion Probe. SAE Technical Paper Series.
6. (1989) Tomographic imaging of two-component
ow using capacitance sensors. Journal of Physics E:
Scientic Instruments, 22.
7. (2001) Electrical capacitance tomography measurements
on the pneumatic conveying of solids. In-
dustrial & Engineering Chemistry Research, 40.
8.A.J. Jaworski, T.D. (2001) Measurement Science
and Technology Application of electrical capacitance
tomography for measurement of gas-solids
ow characteristics
in a pneumatic conveying system. Mea-
surement Science and Technology, 12.
9. (2006) Application of electrical capacitance tomography
for bulk solids
ow analysis in silos. Particle and
Particle Systems Characterization, 23.
10.Liu, S., Wang, H., Jiang, F., and Yang, W.Q.
(2002) A new image reconstruction method for tomographic
investigation of
uidized beds. AIChE Jour-
nal, 48 (8), 1631{1638.
11.Z.Gut (2016) Selected application of electrical capacitance
tomography in monitoring of combustion
process. Transactions of the Institute of Aviation, 4.
12.Waterfall, R.C. (2000) Imaging combustion using
electrical capacitance tomography. IEE Seminar on
Advanced Sensors and Instrumentation Systems for
Combustion Processes.
13.CHEN, Q., and LIU, S. (2012) Flame Imaging in
Meso-scale Porous Media Burner Using Electrical Capacitance
Tomography. Chinese Journal of Chemical
Engineering, 20 (2), 329{336.
14.Lawton J., W.F.J. (1969) Electrical Aspects of
Combustion, Clarendon Press, Oxford, UK.
15.Kojima, J., Ikeda, Y., and Nakajima, T. (2005) Basic
aspects of OH(A) CH(A), and C2(d) chemiluminescence
in the reaction zone of laminar methane{air
premixed
ames. Combustion and Flame, 140 (1-2),
34{45.
16.PANOUTSOS, C., HARDALUPAS, Y., and TAYLOR,
A. (2009) Numerical evaluation of equivalence
ratio measurement using OH* and CH* chemiluminescence
in premixed and non-premixed methane-air
ames. Combustion and Flame, 156 (2), 273{291.
17.Ikeda, Y., Kojima, J., Nakajima, T., Akamatsu,
F., and Katsuki, M. (2000) Measurement of the local
amefront structure of turbulent premixed
ames by
local chemiluminescence. Proceedings of the Com-
bustion Institute, 28 (1), 343{350.
18.Bowman, C.T., and Seery, D.J. (1968) Chemiluminescence
in the high-temperature oxidation of
methane. Combustion and Flame, 12 (6), 611{614.
19.Docquier, N., and Candel, S. (2002) Combustion
control and sensors: a review. Progress in Energy and
Combustion Science, 28 (2), 107{150.
20.DANDY, D.A.V.I.D.S., and VOSEN,
S.T.E.V.E.N.R. (1992) Numerical and Experimental
Studies of Hydroxyl Radical Chemiluminescence
in Methane-Air Flames. Combustion Science and
Technology, 82 (1-6), 131{150.
21.Yang, Y., and Peng, L. (2013) A congurable electrical
capacitance tomography system using a combining
electrode strategy. Measurement Science and
Technology, 24 (7), 074005.
22.Ye, J., Wang, H., and Yang, W. (2016) Evaluation
of electrical capacitance tomography sensor based on
the coupling of
uid eld and electrostatic eld. Mea-
surement Science and Technology, 27 (7), 074003.
Published
2020-07-27
How to Cite
GUT, Zbigniew.
Correlation of measurements OH*, CH*, C2* and H2O with changing signal of Electrical Capacitance Tomography system in the reaction zone of methane/air premixed flames.
Journal of Power Technologies, [S.l.], v. 100, n. 3, p. 179-187, july 2020.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1399>. Date accessed: 21 nov. 2024.
Issue
Section
Combustion and Fuel Processing
Keywords
combustion process; visualization; tomography; spectrometer
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