Experimental Study on Cellular Premixed Propane Flames in a Narrow Gap between Parallel Plates

Coupling of vibro-acoustic waves with premixed flame

“…S2). As remarked by Alexeev et al [27], these oscillations are not corresponding to the fundamental acoustic mode that is usually observed in tubes, indicating that the coupling with the burner seems to be different.…”

“…When focusing on the topology of the flame interface, both parametric restabilization and parametric resonance are possible to be forced, as predicted by the Searby and Rochwerger [8] theory. It has been shown that the plate modes may be excited by the flame propagation itself and are certainly responsible for the flame speed oscillations with unexpected frequencies observed in recent experiments [18,26,27].…”

“…More recently, accurate studies of the Darrieus-Landau wrinkling have been performed in an experimental device which allows to reduce the flame dynamics to a quasi-bidimensionnal one [18,[23][24][25][26][27][28][29]. The two dimensional dynamics has been shown to be similar to that of freely propagating flames [18].…”

“…For smaller gap or smaller thickness of the glass plates, no oscillating instability was obtained, one possible reason being that viscous losses and acoustic loss at walls are too large to allow pressure fluctuations to excite the acoustic mode of the burner [32]. However, in most of the Hele-Shaw burners, some transient pseudo-periodic oscillations of the flame speed have been observed just after the ignition of the flame of the flame front (see Alexeev et al [27] Fig. 3 or Jang et al [26] Fig.…”

Numerical simulation of methane flame propagation in a gap between parallel plates

“…Установлено влияние числа Льюиса на процесс развития неустойчивости и образование ячеек [12,14,15], исследовано поведение околопредель-ных типов пламени с распадом на отдельные очаги, переходом к спиновому горению и скручиванием пламени в спираль [16,17]. В недавней экспериментальной работе [18] выполнена визуализация распространения пламени методом длительной экспозиции, позволившая выявить характер движения угловых точек, разделяющих ячейки, возникновение ячеек и их поглощение соседними ячейками.…”