NUMERICAL SIMULATION OF FLAME PROPAGATION NEAR EXTINCTION CONDITION IN A MICRO COMBUSTOR

2004 ◽  
Vol 8 (1) ◽  
pp. 71-89 ◽  
Author(s):  
Kwon Hyoung Choi ◽  
Han Bee Na ◽  
Dae Hoon Lee ◽  
Sejin Kwon
Keyword(s):  
Numerical Simulation ◽  
Flame Propagation ◽  
Extinction Condition ◽  
Near Extinction ◽  
Micro Combustor

Numerical Simulation of Premixed Propane/Air Flame Propagation Using a Dynamically Thickened Flame Approach

2013 ◽  
Vol 444-445 ◽  
pp. 1574-1578 ◽  
Author(s):  
Hua Hua Xiao ◽  
Zhan Li Mao ◽  
Wei Guang An ◽  
Qing Song Wang ◽  
Jin Hua Sun
Keyword(s):  
Numerical Simulation ◽  
Flame Propagation ◽  
Numerical Study ◽  
Vortex Motion ◽  
Combustion Process ◽  
Single Step ◽  
Premixed Combustion ◽  
Premixed Flame ◽  
Flame Surface ◽  
Arrhenius Kinetics

A numerical study of premixed propane/air flame propagation in a closed duct is presented. A dynamically thickened flame (TF) method is applied to model the premixed combustion. The reaction of propane in air is taken into account using a single-step global Arrhenius kinetics. It is shown that the premixed flame undergoes four stages of dynamics in the propagation. The formation of tulip flame phenomenon is observed. The pressure during the combustion process grows exponentially at the finger-shape flame stage and then slows down until the formation of tulip shape. After tulip formation the pressure increases quickly again with the increase of the flame surface area. The vortex motion behind the flame front advects the flame into tulip shape. The study indicates that the TF model is quite reliable for the investigation of premixed propane/air flame propagation.

scholarly journals Numerical simulation of hemispherical hydrogen–air flame propagation with heat losses

2020 ◽  
Vol 1556 ◽  
pp. 012035
Author(s):  
A Yu Mikushkin ◽  
V V Volodin ◽  
V V Golub ◽  
A I Gavrikov ◽  
V A Petukhov
Keyword(s):  
Numerical Simulation ◽  
Flame Propagation ◽  
Heat Losses

916 Numerical Simulation of Flame Propagation in Channels with Obstalces(1)

2006 ◽  
Vol 2006 (0) ◽  
pp. _916-a_
Author(s):  
Takanobu Ogawa ◽  
Vadim N. Gamezo ◽  
Elaine S. Oran ◽  
Tsuyoshi Nozu
Keyword(s):  
Numerical Simulation ◽  
Flame Propagation

Pressure and flow propagation rule beyond original premixed area of methane-air in tunnel

2014 ◽  
Vol 24 (8) ◽  
pp. 1626-1635 ◽  
Author(s):  
Qi Zhang ◽  
Qiuju Ma
Keyword(s):  
Numerical Simulation ◽  
Flame Propagation ◽  
Volume Fraction ◽  
Ignition Point ◽  
Content Type ◽  
Explosion Overpressure ◽  
Air Explosion ◽  
Propagation Rule ◽  
Flow Propagation ◽  
Propagation Rules

Purpose – Whether a fire can be initiated in an explosion accident depends on the explosion and deflagration process. In the methane-air explosion in a tunnel, the flame accelerates from the ignition point. However, where it begins to decelerate is not clear. The purpose of this paper is to examine the explosion overpressure, flow and flame propagation beyond the premixed area of methane-air in a tunnel. Design/methodology/approach – The numerical simulation was used to study the explosion processes of methane-air mixtures in a tunnel. Based on the numerical simulation and its analysis, the explosion overpressure, flow and flame propagation rules beyond the premixed area were demonstrated for a methane-air explosion. Findings – The peak overpressure of methane-air mixture explosion was observed to reach its maximum beyond the original premixed area of methane-air. The hazardous effects beyond the premixed area may be stronger than those within the premixed area for a methane-air explosion in a tunnel. Under the conditions of this study, the ratio between the length of combustion area (40 m) and that of original premixed area (28 m) reaches 1.43. Originality/value – Little attention has been devoted to investigating the explosion overpressure, flow and flam propagations beyond the original premixed area of methane-air in a tunnel. Based on the numerical simulation and the analysis, the propagation rule of overpressure wave and flow inside and outside the space occupied by methane/air mixture at the volume fraction of 9.5 percent in a tunnel were obtained in this work.

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