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LES of Partially Premixed Combustion
2002Numerical 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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Incomplete combustion in nonadiabatic premixed gas flames
Physical Review E, 1996The inward propagating spherical flame and burner stabilized Bunsen-type flame of low-Lewis-number premixtures are studied numerically. It is shown that reduction of the reaction rate induced by the flame stretch makes the flame vulnerable to the radiative heat losses which may well result in a partial or complete extinction of the flame.
, Kagan, , Sivashinsky
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Combustion Noise from Non-premixed and Lean-premixed Swirl Flames
Acta Acustica united with Acustica, 2009The development of modern gas turbines and jet engines is focused on the reduction of pollutant emissions and, increasingly, on the reduction of overall noise emission, including combustion noise. This requires the minimization of the noise sources, namely noise from the turbulent flow, combustion noise and noise caused by periodic instabilities and ...
Christian Bender, Horst Büchner
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Combustion Modeling of Diesel Combustion with Partially Premixed Conditions
SAE Technical Paper Series, 2007<div class="htmlview paragraph">Two turbulent combustion modeling approaches, which were large eddy simulations in conjunction with detailed kinetics (LES-CHEMKIN) and Reynolds Averaged Navier Stokes with detailed kinetics (RANS-CHEMKIN), were used to model two partially premixed engine conditions.
Bing Hu +4 more
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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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Combustion of partially premixed spray jets
Proceedings of the Combustion Institute, 2005Abstract 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 +3 more
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Active control of combustion oscillations for premixed combustion systems
Journal de Physique IV (Proceedings), 2002Methane premixed flame is studied extensively using a swirl burner and a swirl combustion chamber. First the fundamental study for the flame properties is performed for the swirl burner. Flame configuration is analyzed by a high speed photography and Schlieren system. Then a control system is set up using MATLAB, Simulink, PPC Controller board, dSPACE,
A. K. Hayashi +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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Non premixed Supersonic flames: Combustion models
50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012The aim of this work is to investigate the validity of combustion models that were developed for low-speed combustion and then traditionally extended to high-speed combustion. In fact, the assumption of fast chemist ry, as well as the flamelet chemistry model, must be validated in supersonic flows, where compressibility may affect the flame structure ...
INGENITO, ANTONELLA +3 more
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