Pulsating Mode of Flame Propagation in Two-Dimensional Channels

AIAA Journal ◽  
2005 ◽  
Vol 43 (6) ◽  
pp. 1284-1292 ◽  
Author(s):  
Changrong Cui ◽  
Moshe Matalon ◽  
Thomas L. Jackson
Keyword(s):  
Flame Propagation ◽  
Two Dimensional

scholarly journals The effects of hydrodynamic stretch on the flame propagation enhancement of ethylene by addition of ozone

2015 ◽  
Vol 373 (2048) ◽  
pp. 20140339 ◽  
Author(s):  
Matthew Pinchak ◽  
Timothy Ombrello ◽  
Campbell Carter ◽  
Ephraim Gutmark ◽  
Viswanath Katta
Keyword(s):  
Heat Release ◽  
Flame Propagation ◽  
Atmospheric Pressure ◽  
Flame Speed ◽  
Two Dimensional ◽  
Axial Stretch ◽  
Exit Velocity ◽  
One Dimensional ◽  
Burner Exit ◽  
Steady Laminar

The effect of O 3 on C 2 H 4 /synthetic-air flame propagation at sub-atmospheric pressure was investigated through detailed experiments and simulations. A Hencken burner provided an ideal platform to interrogate flame speed enhancement, producing a steady, laminar, nearly one-dimensional, minimally curved, weakly stretched, and nearly adiabatic flame that could be accurately compared with simulations. The experimental results showed enhancement of up to 7.5% in flame speed for 11 000 ppm of O 3 at stoichiometric conditions. Significantly, the axial stretch rate was also found to affect enhancement. Comparison of the flames for a given burner exit velocity resulted in the enhancement increasing almost 9% over the range of axial stretch rates that was investigated. Two-dimensional simulations agreed well with the experiments in terms of flame speed, as well as the trends of enhancement. Rate of production analysis showed that the primary pathway for O 3 consumption was through reaction with H, leading to early heat release and increased production of OH. Higher flame stretch rates resulted in increased flux through the H+O 3 reaction to provide increased enhancement, due to the thinning of the flame that accompanies higher stretch, and thus results in decreased distance for the H to diffuse before reacting with O 3 .

Flame propagation in two-dimensional solids: Particle-resolved studies with complex plasmas

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
S. O. Yurchenko ◽  
E. V. Yakovlev ◽  
L. Couëdel ◽  
N. P. Kryuchkov ◽  
A. M. Lipaev ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Two Dimensional ◽  
Complex Plasmas

scholarly journals Simulation of combustion of methane-air mixture in two-dimensional approximation

2022 ◽  
Vol 2150 (1) ◽  
pp. 012013
Author(s):  
K M Moiseeva ◽  
A Yu Krainov
Keyword(s):  
Mathematical Model ◽  
Thermal Expansion ◽  
Flame Propagation ◽  
Numerical Study ◽  
Mathematical Formulation ◽  
Combustion Process ◽  
Two Dimensional ◽  
Initial Stage ◽  
Dimensional Approximation ◽  
Reactive Mixture

Abstract The paper presents a mathematical model and the results of a numerical study of the flame propagation of a methane-air mixture. The physical and mathematical formulation of the problem takes into account the thermal expansion of the gas and its subsequent movement. The problem was solved numerically using the Van Leer method to determine the fluxes at the boundaries of the computational cells. A study of flame propagation in a methane-air mixture with a methane content less than or equal to stoichiometric has been carried out. The conditions for focal ignition of a reactive mixture are determined. The influence of the channel walls on the features of flame propagation is shown. The necessity of taking into account the non-isobaricity of the combustion process at the initial stage is demonstrated.

scholarly journals Analysis of Gaseous and Gaseous-Dusty, Premixed Flame Propagation in Obstructed Passages with Tightly Placed Obstacles

Fluids ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 115
Author(s):  
Furkan Kodakoglu ◽  
Sinan Demir ◽  
Damir Valiev ◽  
V’yacheslav Akkerman
Keyword(s):  
Flame Propagation ◽  
Premixed Flame ◽  
Dust Particles ◽  
Blockage Ratio ◽  
Two Dimensional ◽  
Analytical Formulation ◽  
Flame Acceleration ◽  
Explosive Materials ◽  
Run Up ◽  
The Impact

A recent predictive scenario of premixed flame propagation in unobstructed passages is extended to account for obstructions that can be encountered in facilities dealing with explosive materials such as in coalmines. Specifically, the theory of globally-spherical, self-accelerating premixed expanding flames and that of flame acceleration in obstructed conduits are combined to form a new analytical formulation. The coalmining configuration is imitated by two-dimensional and cylindrical passages of high aspect ratio, with a comb-shaped array of tightly placed obstacles attached to the walls. It is assumed that the spacing between the obstacles is much less or, at least, does not exceed the obstacle height. The passage has one extreme open end such that a flame is ignited at a closed end and propagates to an exit. The key stages of the flame evolution such as the velocity of the flame front and the run-up distance are scrutinized for variety of the flame and mining parameters. Starting with gaseous methane-air and propane-air flames, the analysis is subsequently extended to gaseous-dusty environments. Specifically, the coal (combustible, i.e., facilitating the fire) and inert (such as sand, moderating the process) dust and their combinations are considered, and the impact of the size and concentration of the dust particles on flame acceleration is quantified. Overall, the influence of both the obstacles and the combustion instability on the fire scenario is substantial, and it gets stronger with the blockage ratio.

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