Direct prediction of laminar burning velocity and quenching distance of hydrogen-air flames using an annular stepwise diverging tube (ASDT)

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Flame propagation characteristics of hydrogen-air mixtures were investigated using an improved annular stepwise diverging tube (ASDT). An infrared detectable camera was used to visualize flame behaviors. Flame propagation velocity (FPV) was examined using the variation of equivalence ratio (or premixing ratio) and flow rate. Conclusively, it was found that hydrogen-air flames have critical FPVs that are not significantly affected by the channel gap scales. The critical FPVs were measured over a range of equivalence ratio of 0.27 to 6.50, and the maximum critical FPV was approximately 285 cm/s at the equivalence ratio of 1.7. These values were comparable to the laminar burning velocities. Quenching distances were also measured using the identical ASDT system, and the minimum value was about 0.60 mm at approximately stoichiometric conditions.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2016-02
Language
English
Article Type
Article
Keywords

PREMIXED FLAME; AXIAL VELOCITY; TEMPERATURE; PROPAGATION

Citation

COMBUSTION AND FLAME, v.164, pp.397 - 399

ISSN
0010-2180
DOI
10.1016/j.combustflame.2015.12.005
URI
http://hdl.handle.net/10203/207423
Appears in Collection
ME-Journal Papers(저널논문)
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