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Onset of cellular instabilities in spherically propagating hydrogen-air premixed laminar flames
journal contribution
posted on 2012-10-03, 07:44 authored by Fushui Liu, Xiuchao Bao, Jiayi Gu, Rui ChenUsing high-speed Schlieren and Shadow photography, the instabilities of outwardly
propagating spherical hydrogen-air flames have been studied in a constant volume
combustion bomb. Combustion under different equivalence ratios (0.2 w 1.0), temperatures
(298 K w 423 K) and pressures (1.0 bar w 10.0 bar) is visualized. The results show that
flames experience both unequal diffusion and/or hydrodynamic instabilities at different
stages of propagation. The critical flame radius for such instabilities is measured and
correlated to the variations of equivalence ratio, temperature and pressure. Analysis
revealed that equivalence ratio affects unequal diffusion instability via varying the Lewis
number, Le; increased temperature can delay both types of instabilities in the majority of
tests by promoting combustion rate and changing density ratio; pressure variation
has minor effect on unequal diffusion instability but is responsible for enhancing
hydrodynamic instability, particularly for stoichiometric and near-stoichiometric flames.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Citation
LIU, F. ... et al, 2012. Onset of cellular instabilities in spherically propagating hydrogen-air premixed laminar flames. International Journal of Hydrogen Energy, 37 (15), pp.11458-11465.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2012Notes
NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published at: http://dx.doi.org/10.1016/j.ijhydene.2012.05.013ISSN
0360-3199Publisher version
Language
- en