Flame Front Deformation Instabilities of Filtration Combustion for Initial Thermal Perturbation

2020 ◽  
Vol 43 (8) ◽  
pp. 1608-1617
Author(s):  
Yongfang Xia ◽  
Lu Chen ◽  
Junrui Shi ◽  
Benwen Li
Keyword(s):  
Flame Front ◽  
Filtration Combustion ◽  
Thermal Perturbation

scholarly journals Numerical investigation of low-velocity filtration combustion instability based on the initial preheating non-uniformity

2019 ◽  
Vol 136 ◽  
pp. 02040
Author(s):  
Yongfang Xia ◽  
Tingyong Fang ◽  
Haitao Wang ◽  
Erbao Guo ◽  
Jinwei Ma
Keyword(s):  
Flame Front ◽  
Equivalence Ratio ◽  
Hydrodynamic Instability ◽  
Packed Bed ◽  
Filtration Velocity ◽  
Thermal Perturbation ◽  
Low Velocity ◽  
Preheating Temperature ◽  
Deformation Behaviors ◽  
Fuel Leakage

The effects of the initial preheating perturbation on the dynamical behaviors of FGC wave propagation instability for low-velocity FGC in packed bed are studied numerically. The behaviors of the flame front inclination, break, and shrinking instabilities are always observed in experiments. Based on the experimental phenomena, an initial thermal perturbation model is numerically proposed as to predict the deformation behaviors of the flame front instabilities. The typical flame shapes are obtained depending on filtration velocity, equivalence ratio, and initial preheating temperature difference. It is demonstrated that the development of flame front inclination instability is proportional to the magnitude of initial preheating perturbation. At a lower equivalence ratio, the initial thermal perturbation of 300 K leads to the evolution of flame front break. Increasing filtration velocity leads to the appearance of flame front break, due to the intensification of the hydrodynamic instability. In addition, a perculiar instability of flame front shifting is also confirmed with the initial thermal perturbation of 400 K, which results in a fuel leakage of incomplete combustion.

Numerical Studies on the Inclined Flame Front Break of Filtration Combustion in Porous Media

2013 ◽  
Vol 27 (8) ◽  
pp. 4969-4976 ◽  
Author(s):  
Junchun Zhang ◽  
Leming Cheng ◽  
Chenghang Zheng ◽  
Zhongyang Luo ◽  
Mingjiang Ni
Keyword(s):  
Porous Media ◽  
Flame Front ◽  
Filtration Combustion ◽  
Numerical Studies

Thermochemical Processing of the Waste Containing Organic Substances by Means of Filtration Combustion;

2004 ◽  
Vol 35 (5-6) ◽  
pp. 387-392
Author(s):  
V. A. Borodulya ◽  
L. M. Vinogradov ◽  
S. A. Zhdanok ◽  
A. V. Krauklis
Keyword(s):  
Filtration Combustion ◽  
Organic Substances ◽  
Thermochemical Processing

Modeling of Filtration Combustion in a Porous Medium with Spatially Nonhomogeneous Characteristics

2007 ◽  
Vol 38 (1) ◽  
pp. 33-43
Author(s):  
K. V. Dobrego ◽  
I. A. Koznacheev ◽  
I. M. Kozlov
Keyword(s):  
Porous Medium ◽  
Filtration Combustion

Mechanism of detonation formation as a result of free flame propagation in unconfined space

2019 ◽  
Vol 489 (5) ◽  
pp. 461-464
Author(s):  
A. D. Kiverin ◽  
I. S. Yakovenko ◽  
V. E. Fortov
Keyword(s):  
Shock Waves ◽  
Flame Front ◽  
Flame Propagation ◽  
Linear Stage ◽  
Local Formation ◽  
Stage Of Development ◽  
Detonation Transition

The problem of the detonation formation as a result of unconfined flame propagation is solved numerically. The mechanism of detonation formation is distinguished. It is related to the local formation of shock waves du- ring the linear stage of development of flame front perturbations formed on the surface of the expanding flame front. General criteria of the establishment of the conditions for the detonation transition via the proposed mechanism are formulated.

Characteristic analysis of low-velocity gas filtration combustion in an inert packed bed

2006 ◽  
Vol 10 (4) ◽  
pp. 683-700 ◽  
Author(s):  
G. Zhang ◽  
X. Cai ◽  
M. Liu ◽  
B. Lin ◽  
Y. Chen ◽  
...  
Keyword(s):  
Filtration Combustion ◽  
Packed Bed ◽  
Gas Filtration ◽  
Characteristic Analysis ◽  
Low Velocity
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