Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7721873 | International Journal of Hydrogen Energy | 2013 | 8 Pages |
Abstract
We recently developed a micro-combustor with a bluff body, which has a demonstrated 3- to 5-time extension in the blow-off limit. In the present work, the dimension effect of the bluff body on the blow-off limit (indicated by the blockage ratio, ζ) was investigated with a detailed H2/O2 reaction mechanism. The results indicate that the blow-off limits for ζ = 0.3, 0.4 and 0.5 are 20, 31 and 36 m/s, respectively. Analyses reveal that for ζ = 0.3, flame blowout occurs due to insufficient recirculation zone size. However, flame blowout occurs due to the stretching effect in the shear layers when ζ = 0.4 and 0.5. Calculations indicate that the three cases have negligible differences in heat loss because the high temperature zones are located in the combustor centers; therefore, their effects on the combustor walls are mitigated.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Aiwu Fan, Jianlong Wan, Yi Liu, Boming Pi, Hong Yao, Kaoru Maruta, Wei Liu,