Results 141 to 150 of about 279 (180)

Edges of flames that do not exist: flame-edge dynamics in a non-premixed counterflow

Combustion Theory and Modelling, 2000
A counterflow diffusion flame model is studied revealing that, at least as a part of the quenching boundary is approached in parameter space at low-enough Lewis numbers, an edge of a diffusion flame, or triple flame, has a propagation speed that still advances the burning solution into regions that are not burning.
Thatcher, R. W., Dold, J. W.
openaire   +2 more sources

Investigation of velocity boundary conditions in counterflow flames

KSME International Journal, 2002
The effects of velocity boundary conditions on the structure of methane-air nonpremixed counterflow flames were investigated by two-dimensional numerical simulation. Two low global strain rates, 12 s−1 and 20 s−1, were considered for comparison with measurements.
Woe-Chul Park, Anthony Hamins
openaire   +1 more source

Determination of burning velocity using counterflow flames

Symposium (International) on Combustion, 1985
A technique has been developed to measure burning velocity using counterflow double flames established in the forward stagnation region of the porous cylinder. In this system, two different regimes occur for the inner premixed flame depending on whether the mixtureejection velocity is more or less than the burning velocity. A plot of the flame position
Ichiro Yamaoka, Hiroshi Tsuji
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Determination of Markstein numbers in counterflow premixed flames

Combustion and Flame, 2002
This paper attempts to settle a long-standing issue concerning the differences in Markstein numbers measured by different experimental protocols. Numerical simulations of a counterflow flame with full transport coefficients, but using a fictitious reactive mixture having properties close to those assumed in asymptotic laminar flame analysis, are used ...
Davis, Scott, Quinard, Joël, Searby, Geoffrey   +2 more
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The acoustic response of Burke–Schumann counterflow flames

Combustion and Flame, 2018
Abstract The acoustic response of strained nonpremixed flames is investigated using as a canonical model problem the planar counterflow configuration subject to small harmonic fluctuations of the stagnation-point pressure and strain rate. To focus on effects of modified transport rates the analysis employs the limit of infinitely fast reaction for a ...
Adam D. Weiss, Wilfried Coenen, Antonio L. Sánchez, Forman A. Williams   +3 more
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Simulation of Soot Size Distribution in a Counterflow Flame

International Journal of Chemical Reactor Engineering, 2014
Abstract Soot formed during the rich combustion of fossil fuels is an undesirable pollutant and health hazard. A newly developed Monte Carlo method is used to simulate the soot formation in a counterflow diffusion flame of ethylene.
Z. He, K. Zhou, M. Xiao, F. Wei
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Thermoacoustic Instabilities in Counterflow Diffusion Flames

2019
Thermoacoustic instabilities arise in combustion systems from a coupling between the unsteady heat release of the flame and the underlying acoustic field. Although thermoacoustics have been studied extensively with regards to premixed flames, where the fuel and oxidizer are fully mixed before combustion, the study of thermoacoustics in diffusion flames
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The evolution of a soot aerosol in a counterflow diffusion flame

Combustion and Flame, 1987
The dynamics of a soot aerosol in a stagnation point diffusion flame have been simulated numerically. The impact of the flow velocity gradient on soot loading which was observed experimentally was found to arise simply from variations in aerosol residence times; the computed effect was consistent with constant particle formation and growth rates.
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The Effects of CO2 Additional on Flame Characteristics in the CH4/N2/O2 Counterflow Diffusion Flame

Molecules, 2021
Wang Jingfu, Ying Chen, Xiaolei Zhang
exaly  

Counterflow diffusion flame under reduced gravity

Journal of Visualization, 2003
Shuichi Torii, Toshiaki Yano, H. Maeda
openaire   +1 more source