Results 121 to 130 of about 217 (162)
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Soot formation in unsteady counterflow diffusion flames
Proceedings of the Combustion Institute, 2009Abstract The formation of pollutant species in turbulent diffusion flames is strongly affected by the coupling between the highly non-linear chemical kinetics with three-dimensional, unsteady hydrodynamics. It is necessary to better understand this interdependency of transport and kinetic mechanisms, in order to accurately predict non-equilibrium ...
CUOCI, ALBERTO +3 more
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The evolution of a soot aerosol in a counterflow diffusion flame
Combustion and Flame, 1987The 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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Aggregate formation in sooting counterflow diffusion flames
Proceedings of the Combustion Institute, 2002Soot formation is investigated experimentally and numerically in a counterflow diffusion flame which isformed by an acetylene/nitrogen mixture on the fuel side and hot postflame gases of a lean premixed flame on the oxidizer side. The modeling approach uses a detailed chemical mechanism with 453 reactions and 82 species.
C. Pels Leusden, C. Hasse, N. Peters
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Effects of Soret Diffusion on Premixed Counterflow Flames
Combustion Science and Technology, 2015Soret diffusion is a secondary mass diffusion and it affects laminar flames with very light or heavy species and large temperature gradients. To get a general understanding of Soret effects on stretched flames, we conduct theoretical analysis on a premixed counterflow flame with Soret diffusion. A deliberately idealized premixed counterflow flame model
Wang Han, Zheng Chen
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Preferential diffusion and concentration modification in sooting counterflow diffusion flames
Symposium (International) on Combustion, 1989An experimental investigation has been conducted on the influence of the mobility of inert additives on soot formation in propane and ethylene counterflow diffusion flames. Inerts used were helium, neon, argon, or krypton, and the results show that while the mobility of the inert has practically no effect when a small amount of inert is added to the ...
R.L. Axelbaum, C.K. Law, W.L. Flower
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Counterflow Diffusion Flames of General Fluids: Oxygen/Hydrogen Mixtures
45th AIAA Aerospace Sciences Meeting and Exhibit, 2007Abstract A comprehensive framework has been established for studying laminar counterflow diffusion flames for general fluids over the entire regime of thermodynamic states. The model incorporates a unified treatment of fundamental thermodynamic and transport theories into an existing flow solver DMCF to treat detailed chemical kinetic mechanisms and ...
Ribert, Guillaume +5 more
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Extinction of Counterflow Diffusion Flame in High Pressures
Combustion Science and Technology, 1991Extinction of the counterflow diffusion flame in high pressures has been studied experimentally up to the ambient pressure of 10 MPa. Oxidizer was air and fuels were methane, ethane. carbon monoxide, carbon monoxide/hydrogen mixtures. Experimental results have shown that the critical stagnation velocity gradients for the methane and ethane are about ...
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Thermoacoustic Instabilities in Counterflow Diffusion Flames
2019Thermoacoustic 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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Temperature and concentration measurements by CARS in counterflow laminar diffusion flames
Experiments in Fluids, 1995Abstract: The combination of broadband CARS thermometry on nitrogen with the narrowband technique, for detection of a second major species, is applied to counterflow laminar propane-air diffusion dames. Temperature profiles are measured for various conditions of strain and equivalence ratio.
Magre, P. +5 more
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Edge flame instability in low-strain-rate counterflow diffusion flames
Combustion and Flame, 2006Abstract Experiments in low-strain-rate methane–air counterflow diffusion flames diluted with nitrogen have been conducted to study flame extinction behavior and edge flame oscillation in which flame length is less than the burner diameter and thus lateral conductive heat loss, in addition to radiative loss, could be high at low global strain rates ...
June Sung Park +7 more
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