Results 201 to 210 of about 6,488 (253)

Extinction of partially premixed flames

Proceedings of the Combustion Institute, 2002
Experimental and numerical studies on extinction of laminar partially premixed flames are carried out. The studies are performed in the counterflow configuration. A premixed fuel-rich mixture of methane (CH 4 ), oxygen (O 2 ), and nitrogen (N 2 ) is injected from one duct while a fuel-lean mixture of CH 4 , O 2 , and N 2 is injected from the other ...
R. Seiser, L. Truett, K. Seshadri
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Characterization of Partially Premixed Combustion

SAE Technical Paper Series, 2006
<div class="htmlview paragraph">Partially Premixed Combustion (PPC) provides the potential of simultaneous reduction of NOx and soot for diesel engines. This work attempts to characterize the operating range and conditions required for PPC. The characterization is based on the evaluation of emission and in-cylinder measurement data of engine ...
Christof Noehre, Magnus Andersson, Bengt Johansson, Anders Hultqvist   +3 more
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Modelling and Calculation of a Partially Premixed Turbulent Flame

Combustion Science and Technology, 1999
A partially premixed turbulent flame has been modelled using the laminar flamelet concept, i.e. the assumption that laminar flames are embedded in the turbulent flow field. A combination of a premixed flamelet model and a diffusion flamelet model has been used for modelling this partially premixed flame.
Ovink, R., Lamers, A.P.G.G.
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Influence of Fuel Premixing on Partially Premixed Flames in Porous-Wall Channels

International Journal of Nonlinear Sciences and Numerical Simulation, 2017
Abstract This paper examines the influence of mixing a fuel with an oxidizer-rich reactant on the existence and propagation of partially premixed flames formed in a porous-wall channel. The amount of the injected fuel has been taken as a parameter to generate different states of the combustion mixtures.
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LES of Partially Premixed Combustion

2002
Numerical studies devoted to partially premixed combustion are first reviewed. Then a Large Eddy Simulation procedure is proposed for these flames when they develop in turbulent flows. The corresponding subgrid combustion modeling is tested for the case of a turbulent lifted-flame.
Luc Vervisch, Pascale Domingo
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Combustion of partially premixed spray jets

Proceedings of the Combustion Institute, 2005
Abstract Gas turbines, liquid rocket motors, and oil-fired furnaces utilize the spray combustion of continuously injected liquid fuels. In most cases, the liquid spray is mixed with an oxidizer prior to combustion, and further oxidizer is supplied from the outside of the spray to complete diffusion combustion.
Masato Mikami, Kazuhiro Yamamoto, Osamu Moriue, Naoya Kojima   +3 more
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NO formation in counterflow partially premixed flames

Combustion and Flame, 2007
An experimental and computational study of NO formation in low-strain-rate partially premixed methane counterflow flames is reported. For progressive fuel-side partial premixing the peak NO concentration increased and the NO distribution along the stagnation streamline broadened.
Hemant Mungekar, Arvind Atreya
openaire   +1 more source

Partial premixing in diffusion flame quenching

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2001
AbstractUsing Direct Numerical Simulation, we focus on the development of partial premixing in laminar diffusion flame quenching. Calculations are performed in the configuration of a 2‐D diffusion flame squeezed by a pair of vortices. First, the flame undergoes strong finite rate chemistry effects, linked to high levels of strain rate induced by ...
Favier, V., Vervisch, L.
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Partially premixed diffusion flamelets in non-premixed turbulent combustion

Symposium (International) on Combustion, 1985
The structure and extinction of partially premixed diffusion flamelets in a turbulent flow field is analyzed. It is shown that diffusion flamelets are disconnected if the variation of the mixture fraction around stoichiometric is large enough for the corresponding adiabatic flame temperature to be less than a characteristic freezing temperature. At the
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Emissions and Soot in Partially Premixed Combustion

2014
Practical combustion systems typically undergo non-premixed mode of combustion, in which the fuel is injected directly into the combustion chamber, which already has compressed air. The emissions tend to be high in this diffusion mode of combustion as compared to premixing mode.
Surbhi Kohli, Abhijit Kushari
openaire   +1 more source