Results 231 to 240 of about 12,314 (268)
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Partially Premixed Combustion in Lifted Turbulent Jets
Combustion Science and Technology, 2000This article reports observations of structures consistent with triple flame reaction zones in the stabilization region of turbulent nonpremixed jet flames. Previous studies of laminar mixing layers and nonpremixed jets show Hi brachial structures, however reports of triple flame structures in turbulent flowfields are sparse, The asymmetric coflow ...
K.M. LYONS, K.A. WATSON
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Modeling partially premixed turbulent combustion
2001This paper investigates the process of partially premixed turbulent combustion in situations where the fuel is provided either as a liquid spray or a purely gaseous stream. In the former case, two-dimensional direct numerical simulations in association with a Lagrangian solver for the dispersed vaporizing phase are employed.
M. Herrmann +6 more
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Partially premixed diffusion flamelets in non-premixed turbulent combustion
Symposium (International) on Combustion, 1985The 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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Correlating Flame Location and Ignition Delay in Partially Premixed Combustion
SAE Technical Paper Series, 2012<div class="section abstract"><div class="htmlview paragraph">Controlling ignition delay is the key to successfully enable partially premixed combustion in diesel engines. This paper presents experimental results of partially premixed combustion in an optically accessible engine, using primary reference fuels in combination with artificial ...
Zegers, R.P.C. +5 more
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Effects of Different Injection Strategies and EGR on Partially Premixed Combustion
SAE Technical Paper Series, 2018<div class="section abstract"><div class="htmlview paragraph">Premixed Charge Compression Ignition concepts are promising to reduce NOx and soot simultaneously and keeping a high thermal efficiency. Partially premixed combustion is a single fuel variant of this new combustion concepts applying a fuel with a low cetane number to achieve the ...
Han, J., Wang, S., Somers, L.M.T.
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Large Eddy Simulation of Partially Premixed Combustion in an Internal Combustion Engine
SAE Technical Paper Series, 2012<div class="section abstract"><div class="htmlview paragraph">This paper reports on numerical investigations of the mixing, ignition and combustion processes in a laboratory engine operating under partially premixed combustion (PPC) conditions. The engine is a modified version of a 13-liter Scania D13 engine.
Rickard Solsjö +3 more
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Model Predictive Control of Partially Premixed Combustion
2010Partially premixed combustion is a compression ignited combustion strategy where high exhaust gas recirculation (EGR) levels in combination with early or late injection timing result in a prolonged ignition delay yielding a more premixed charge than with conventional diesel combustion. With this concept it is possible to get low smoke and NOx emissions
Per Tunestål, Magnus Lewander
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Turbulent non-premixed combustion in partially premixed diffusion flamelets with detailed chemistry
Symposium (International) on Combustion, 1988The formulation of an extended laminar flamelet model of non-premixed turbulent combustion is developed. The microscopic elements in the turbulent ensemble are taken as laminar diffusion flamelets that are distinguished by the extent of stretching to which they are exposed and, additionally, by the degree to which their reactants are premixed ...
B. Rogg, F. Behrendt, J. Warnatz
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Triple flames and partially premixed combustion in autoignition of non-premixed turbulent mixtures
Symposium (International) on Combustion, 1996The present work deals with autoignition of non-premixed turbulent mixtures. The objective is to study the possible role that partially premixed combustion may play in the propagation of ignition. First, a physical picture based on simple considerations and describing the structure of the flame very early after ignition is discussed.
Domingo, Pascale, Vervisch, L.
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Partially premixed flamelets in LES of nonpremixed turbulent combustion
Combustion Theory and Modelling, 2002Partially premixed flames are observed in nonpremixed turbulent combustion when fuel and oxidizer have mixed before burning. This combustion regime combines the properties of both premixed and diffusion flames. A procedure based on the resolved fields is proposed to associate premixed and diffusion flame descriptions in large eddy simulation.
Domingo, Pascale +2 more
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