Results 261 to 270 of about 45,053 (298)
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Bounds for the propagation speed of combustion flames
Journal of Physics A: Mathematical and General, 2004Summary: We focus on a combustion model for premixed flames based on two coupled equations determining the spatial dynamics of temperature and fuel density. We rewrite these equations as a classical reaction-diffusion model, so that we can apply some known methods for the prediction of lower and upper bounds to the front speed.
Fort, Joaquim +3 more
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High-Speed Flame Propagation in a Channel and Transition to Detonation
High Temperature, 2020The 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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Propagation speeds for interacting triple flames
Combustion and Flame, 2018Abstract Triple (or tribrachial) flames propagate through mixtures faster than the premixed laminar flame speed due to streamline divergence ahead of the flame base that decelerates the flow into the leading edge of the flame. When multiple triple flames are in close proximity, the bulk propagation speed of the structure can be even faster due to ...
Stephen W. Grib, Michael W. Renfro
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Flame Speed and Self-Similar Propagation of Expanding Turbulent Premixed Flames
Physical Review Letters, 2012In this Letter we present turbulent flame speeds and their scaling from experimental measurements on constant-pressure, unity Lewis number expanding turbulent flames, propagating in nearly homogeneous isotropic turbulence in a dual-chamber, fan-stirred vessel.
Swetaprovo, Chaudhuri +3 more
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Communications on Pure and Applied Mathematics, 2005
AbstractWe study the effect of homogenization on flame propagation in periodic excitable media when the width of the flame is much smaller than the characteristic size of the heterogeneities. © 2005 Wiley Periodicals, Inc.
Caffarelli, L. A. +2 more
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AbstractWe study the effect of homogenization on flame propagation in periodic excitable media when the width of the flame is much smaller than the characteristic size of the heterogeneities. © 2005 Wiley Periodicals, Inc.
Caffarelli, L. A. +2 more
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Investigation of the structure and propagation speeds of n-heptane cool flames
Combustion and Flame, 2019Abstract Low temperature combustion of n-heptane was investigated through an experimental and numerical study of laminar cool flame structure and propagation speeds. Lean and stoichiometric n-heptane cool flames of equivalence ratios 0.4–1.0 were stabilized using a Hencken burner at sub-atmospheric pressures.
Mohammadhadi Hajilou +3 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), 2005The 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 +3 more
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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 +6 more
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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 +6 more
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Combustion and Flame, 2011
Abstract Large discrepancies among the laminar flame speeds and Markstein lengths of methane/air mixtures measured by different researchers using the same constant-pressure spherical flame method are observed. As an effort to reduce these discrepancies, one linear model (LM, the stretched flame speed changes linearly with the stretch rate) and two ...
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Abstract Large discrepancies among the laminar flame speeds and Markstein lengths of methane/air mixtures measured by different researchers using the same constant-pressure spherical flame method are observed. As an effort to reduce these discrepancies, one linear model (LM, the stretched flame speed changes linearly with the stretch rate) and two ...
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Structure and propagation speeds of turbulent premixed flames—A numerical study
Combustion and Flame, 1991Abstract The aim of the work was to gain understanding of turbulent premixed flames, particularly the local flame speed and structure. Full numerical simulations were made for flames (with simple reactions and Lewis number unity) propagating in a constant density, isotropic turbulent flow; the Reynolds and Damkohler numbers were varied.
Sherif H. El Tahry +2 more
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