Propagation and quenching of premixed flames in a concentration-length-velocity diagram

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The flame propagation velocity (FPV) deviates from the laminar burning velocity (LBV) when a premixed flame is formulated in a combustion space having limited length-scales. In spite of many related studies, the relationship between the FPV and LBV has not been clarified because the FPV depends on the configuration or characteristic length-scale. In this study, variation of the FPV depending on the length-scale is experimentally evaluated using an improved, state-of-the-art annular stepwise diverging tube. Using a transient method, abundant experimental data are obtained for various fuel concentrations (e.g., equivalence ratio). Thus, a continuous physical surface could be established in a Concentration-Length-Velocity diagram (CLV-diagram). The CLV-diagrams for methane and propane flames are successfully described. Three projected planes of the CLV-diagram are related to conventional laminar flame theories, and a comparison of them reveals additional hidden mechanisms. These CLV-diagrams provide an overview of the effects of the length-scale on various characteristic behaviors of laminar premixed flames. The relationship between the critical FPVs (or LBVs) and the quenching distances is identified with the Lewis number. The flame stretch and Markstein length with respect to the FPV are also discussed. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2017
Language
English
Article Type
Article
Keywords

LAMINAR BURNING VELOCITY; STEPWISE DIVERGING TUBE; MESOSCALE CHANNELS; DIRECT PREDICTION; AXIAL VELOCITY; AIR FLAMES; COMBUSTION; DISTANCE

Citation

PROCEEDINGS OF THE COMBUSTION INSTITUTE, v.36, no.3, pp.4243 - 4251

ISSN
1540-7489
DOI
10.1016/j.proci.2016.07.094
URI
http://hdl.handle.net/10203/220960
Appears in Collection
ME-Journal Papers(저널논문)
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