Analytical study in the mechanism of flame movement in horizontal tubesстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The problem of premixed flame propagation in wide horizontal tubes is revisited.
Employing the on-shell description of flames with arbitrary gas expansion, a nonlinear
second-order differential equation for the front position of steady flame is derived.
Solutions to this equation, obtained numerically, reveal two distinct physical regimes
of laminar flame propagation controlled by the strong baroclinic effect. They differ
by the front shape and flame speed, the ratio of the total consumption rates in the two
regimes being 1.4 to 1.8, depending on the value of the gas expansion coefficient.
Comparison with the existing experimental data on methane-air flames is made, and
explanation of the main trends in the observed flame behavior is given. It is shown, in
particular, that the faster (slower) regime of combustion is realized in mixtures close to
(far from) the stoichiometric composition, with pronounced changeover in between.