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Flame Front Deformation Instabilities of Filtration Combustion for Initial Thermal Perturbation
Author(s) -
Xia Yongfang,
Chen Lu,
Shi Junrui,
Li Benwen
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900649
Subject(s) - mechanics , perturbation (astronomy) , instability , combustion , thermal instability , flame front , thermal , materials science , front (military) , equivalence ratio , inert , chemistry , thermodynamics , physics , meteorology , quantum mechanics , combustor , organic chemistry
The flame front deformation instability of low‐velocity filtration combustion within an inert packed bed is studied based on the initial preheating non‐uniformity. Based on the experimental phenomena, an initial thermal perturbation model is numerically proposed so as to predict the deformation behaviors of the flame front instabilities. The numerical prediction indicates that the assumption of an initial thermal perturbation is a feasible explanation as the cause of the flame front inclination instability. As the initial thermal perturbation increases, the phenomena of the flame front break and shrinking instabilities could easily occur at high filtration velocity or low equivalence ratio. Moreover, the evolutions of the flame front break rate and the shrinking rate are quantitatively analyzed.