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Communication Dans Un Congrès Année : 2017

Back-supported stratified flame propagation in lean and nonflammable mixtures

Résumé

In an effort to reduce pollutant emissions and increase energy efficiency, partially premixed combustion has been integrated into many new combustion technologies. The present study investigated lean back-supported flames in a stratified combustion regime. Outwardly propagating flames were observed following ignition under laminar stratification conditions generated in a constant volume vessel. The quantitative analysis of the flame properties relied on simultaneous PIV measurements to obtain local flame burning velocities and stretch rates and used anisole-PLIF measurements to calculate the equivalence ratio. Simultaneous OH-PLIF and OH-gradient measurements were used to differentiate between the burned gas boundaries and the active flame front. This differentiation was necessary to investigate the nonflammable mixture. Simultaneous OH-and anisole-PLIF measurements were used to estimate the thermal flame thickness. Two flame families were investigated: in family A the flame was ignited in a lean mixture (φ=0.6) with a rich stratification; in family B the mixture in the chamber was nonflammable. In rich mixtures ignition compensated for the non-equidiffusive effects of the lean propane flame. Both a flammable and a nonflammable mixture were investigated to evaluate the time scales of the back-supported propagation for the given stratification. The enhanced combustion regime allowed the flame to propagate with an active flame front, even in the nonflammable mixture for a few milliseconds before the flame extinguished.
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Dates et versions

hal-02392338 , version 1 (03-12-2019)

Identifiants

  • HAL Id : hal-02392338 , version 1

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Edouard Delangle, Bertrand Lecordier, Corine Lacour, Armelle Cessou. Back-supported stratified flame propagation in lean and nonflammable mixtures. 8th European Combustion Meeting 2017, Apr 2017, Dubrovnik, Croatia. ⟨hal-02392338⟩
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