Simultaneous Rayleigh scattering and laser-induced CH fluorescence for reaction zone imaging in high-speed premixed hydrocarbon flames |
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Authors: | Yung-cheng Chen Mohy S Mansour |
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Institution: | (1) Department of Power Mechanical Engineering, Tsing Hua University, Hsinchu, Taiwan, R.o.C. (Fax: +886-35/722-840, E-mail: yucchen@net.nthu.edu.tw), TW;(2) Department of Mechanical Engineering, The University of Cairo, Giza, A.R. Egypt (Fax: +202-5/725-303, E-mail: mansour@cairo.eun.eg), EG |
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Abstract: | 4 /air flames where CH concentration is on the order of 1 ppm based on flamelet calculations. The present experimental conditions
are also examined and shown to be suitable for quantitative measurements of CH radical based on the two-level model analysis.
A linear relationship can be found between the measured CH signal intensity and the calculated CH concentration within a maximum
30% uncertainty range. The FWHM thickness of the CH profile in a stoichiometric laminar methane flame was shown to be less
than 0.3 mm, which is the smallest ever achieved. Simultaneous image pairs of flame temperature and concentration of CH radicals
from a premixed turbulent Bunsen flame at an exit velocity of 65 m/sec are obtained to demonstrate the system superiority
of application on high-speed reacting flows.
Received: 29 January 1996/Revised Version: 3 May 1996 |
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Keywords: | PACS: 07 60 22 20 82 40 |
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