Results 161 to 170 of about 44,661 (206)

Consistent definitions of “Flame Displacement Speed” and “Markstein Length” for premixed flame propagation

Combustion and Flame, 2015
Abstract The definition of the flame displacement speed (FDS), often used to characterize the dynamical properties of premixed flames, is generally ambiguous because, except for a steadily propagating planar flame, the mass flow rate through the combustion region varies with distance through the flame and one is therefore faced with the difficulty of
George K. Giannakopoulos, Athanasios Gatzoulis, Christos E. Frouzakis, Moshe Matalon, Ananias G. Tomboulides   +4 more
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Flame Propagation Speed in SI Engines: Modeling and Experimental Assessment

ASME 2005 Internal Combustion Engine Division Fall Technical Conference (ICEF2005), 2005
The necessity for further reductions of in-cylinder pollutant formation and the opportunity to minimize engine development and testing time highlight the need of cycle simulation tools that have to accurately predict the effects of fuel, design and operating variables on engine performance. To develop reliable tools for indicated cycle simulation in SI
BARATTA, MIRKO, CATANIA, ANDREA, SPESSA, EZIO, VASSALLO, Alberto   +3 more
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Measurements of propagation speeds and flame instabilities in biomass derived gas–air premixed flames

International Journal of Hydrogen Energy, 2011
Abstract Three biomass derived gases (BDGs, named GG-H, GG-L and GG-V), which are derived from industry facilities and can be useful for reducing CO2 and the application to combustors, are studied and examined for some basic flame characteristics such as unstretched laminar burning velocity, Markstein length, and cell formation over the entire flame ...
Tran Manh Vu, Won Sik Song, Jeong Park, Dae Seok Bae, Hyun Seok You   +4 more
openaire   +1 more source

High-Speed Flame Propagation in a Channel and Transition to Detonation

High Temperature, 2020
The physical mechanisms controlling the development of a flame prior to transition to detonation in a channel filled with a combustible gaseous mixture are systemized and analyzed. The features of the development of the accelerated flame in a channel are demonstrated with the results of numerical simulation for smooth and obstructed channels.
A. D. Kiverin, I. S. Yakovenko
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Effect of additional diluents on flame propagation speed and markstein length in outwardly propagating premixed methane/ethylene–air flames

Journal of Mechanical Science and Technology, 2018
An experimental study was conducted to understand the effects of additional diluents (CO2 and He) on unstretched flame speed and Markstein length in outwardly propagating spherical premixed CH4/C2H4–air flames at normal temperatures and elevated pressures of up to 0.3 MPa.
Hee June Kim, Kyuho Van, Kee Man Lee, Dae Keun Lee, Young Tae Guahk, Sang In Keel, Jeong Park   +6 more
openaire   +1 more source

Effect of cylindrical confinement on the determination of laminar flame speeds using outwardly propagating flames

Combustion and Flame, 2009
Article history: The effect of nonspherical (i.e. cylindrical) bomb geometry on the evolution of outwardly propagating flames and the determination of laminar flame speeds using the conventional constant-pressure technique is investigated experimentally and theoretically.
Michael P. Burke, Zheng Chen, Yiguang Ju, Frederick L. Dryer   +3 more
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High Speed Schlieren Visualization on Explosion Flame Microstructure and Propagation Behavior

2010 Symposium on Photonics and Optoelectronics, 2010
To discern flame microstructure dynamic behavior of gas explosion under restricted condition, the premixed methane-air explosion was performed in a semi-vented tube. In the experiment, the schlieren photography system was built to record the explosion flame microstructure and propagation behavior, and the relationship between flame speed and flame ...
Xianfeng Chen, Ming Chen, Xiaolei Song, Yujie Wang, Shaofeng Ren, Yin Zhang   +5 more
openaire   +1 more source

Numerical study of unstable hydrogen/air flames: Shape and propagation speed

Proceedings of the Combustion Institute, 2015
Abstract Extensive numerical simulations with detailed chemistry and transport are performed to identify the range of dominance (in terms of equivalence ratio and domain size) of the hydrodynamic instability, the shape of the structures that evolve at long times, and their propagation speed.
Christos E. Frouzakis, Navin Fogla, Ananias G. Tomboulides, Christos Altantzis, Moshe Matalon   +4 more
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Multiple speeds of flame edge propagation for Lewis numbers above one

Combustion Theory and Modelling, 2005
Edges of diffusion flames in a counterflow burner are examined numerically for Lewis numbers greater than unity. When the speed of propagation is plotted against Damköhler number for a range of Lewis numbers a fold bifurcation is observed. It is shown that there exist stable positively and negatively propagating edges for some Damköhler number and ...
Thatcher, R. W., Omon-Arancibia, A. A.
openaire   +2 more sources

Transient flame propagation process and flame-speed oscillation phenomenon in a carbon dust cloud

Combustion and Flame, 2012
A detailed numerical study was conducted to understand the transient flame propagation process and the flame-speed oscillation phenomenon in a carbon dust cloud. The modeling included the solution of a set of time-dependent conservation equations developed for the gas phase and the particle phase in a spherical coordinate.
openaire   +1 more source