Rich-oxygen combustion of a porous cylindrical burner
Date Issued
2012
Date
2012
Author(s)
Chen, Shao-Syuan
Abstract
This experiment investigated the effect of oxygen-enhanced combustion over a cylindrical porous medium burner. The diameter, length, pore diameter, and porosity air 13.7 mm, 80 mm, 40 μm and 69%, respectively. The porous media was used to produce a stable flame, and internal structure of the flame was investigated by measuring the flame temperature distribution and obtaining the CH* and C2* chemiluminescence images. The results revealed that relatively high temperature existed at the exit of the cylindrical burner, and the high temperature zone surrounded the flame contour. The chemiluminescence image was compared with temperature distribution of the flame, and the result showed that the position with more intensive fluorescence and the high temperature zone are coincident. The temperature and the chemical reaction intensity increased as the equivalence ratio decreased, if above 0.8. To increase the efficiency of combustion, oxygen was added in the combustible gas, leading to higher sensitivity of flame variation and extended lean limit of flammability. The flame was then placed in a forced flow field so as to contrast the difference in the strength of flame structure. When the equivalence ratio approached one, the flame required much faster wind velocity to blow off because the burning velocity was higher. The burning velocity was enhanced by increasing the oxygen proportion, and then the resistance of the flame to extinction was also enhanced. From the above experimental results, it is concluded that the oxygen-enhanced premixed flame is more stable when the equivalence ratio is the same but the oxygen content is higher.
Subjects
oxygen-enhanced combustion
the lean flammability limit
the porous cylindrical burner
chemiluminescence
Type
thesis
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