Turbulent Diffusion Flame
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Solução via LES de chamas difusivas de metano, metanol e etanol
This work presents a model for a jet diffusion flame, for low Mach and high Damköhler numbers. The model is based on the solution of the flamelet equations for the chemistry and on the mixture fraction for the flow. This model describes well the behavior of diffusion flames, except at the flame tip, where instabilities can often occur. Numerical results are
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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2. Modelagem de uma chama de difusão turbulenta pela simulação de grandes escalas. / Modeling of a turbulent diffusion flame with the method of large eddy simulation.
The mean goal of this work was to better understand the dynamics of turbulent diffusion flames. The turbulent flow was resolved appling the methodology of Large Eddy Simulation, coupled with the Flamesheet model for reactive systems. The effects of the turbulent subgrid dissipation were accounted with the Smagorinsky (1963) subgrid model. The numerical code
Publicado em: 2009
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3. Numerical analysis of the turbulent coaxial jets / Análise numérica de jatos coaxiais turbulentos
The understanding of the jets behavior is of extreme importance in several practical applications in combustion and propulsion. Therefore, it becomes more and more important the detailed analysis of the parameters that affect the characteristics of this type of flow. This work presents a numerical study of the incompressible turbulent coaxial jets characteri
Publicado em: 2007
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4. Efeito do número de Reynolds e da razão de equivalência na emissão de NOx em chama difusiva turbulenta / Effects of the Reynolds number and equivalence ratio on the NOx emission on turbulent diffusion flame
Este estudo relata uma análise, baseada em dados experimentais, da distribuição de emissão dos Óxidos de Nitrogênio (NOx) em uma chama difusiva turbulenta vertical que utiliza 12 pequenas chamas piloto para ancorá-la. A idéia básica consiste na variação da dinâmica do escoamento e posterior observação do comportamento espacial das espécies qu�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/03/2006
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5. Efeito do número de Reynolds e da razão de equivalência na emissão de NOx em chama difusiva turbulenta / Effects of the Reynolds number and equivalence ratio on the NOx emission on turbulent diffusion flame
Este estudo relata uma análise, baseada em dados experimentais, da distribuição de emissão dos Óxidos de Nitrogênio (NOx) em uma chama difusiva turbulenta vertical que utiliza 12 pequenas chamas piloto para ancorá-la. A idéia básica consiste na variação da dinâmica do escoamento e posterior observação do comportamento espacial das espécies qu�
Publicado em: 2006
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6. CH and C2 radicals characterization in natural gas turbulent diffusion flames
This paper reports the construction of an axisymmetric nonpremixed piloted jet burner, with well-defined initial and boundary conditions, known as the Delft burner, to assess turbulence-chemistry interaction in non-premixed turbulent flames. Detailed experimental information is described, involving hot-wire anemometry, thin-wire thermocouples and chemilumine
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-06
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7. Uma metodologia para anÃlise das conseqÃÃncias de um blowout durante a perfuraÃÃo de poÃos offshore / A methodology for analysis of the consequences of one blowout during the perforation of wells offshore
The main safety concern during the drilling of oil wells is the possibility of blowout. A blowout is the release of hydrocarbons under pressure. In case that the immediate ignition of these hydrocarbons occurs, the expected fire is a jet fire. Jet fire are turbulent diffusion flames. Normally, the thermal energy released for the jet fire is very high and suf
Publicado em: 2005
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8. Numerical simulation of a laboratory-scale turbulent V-flame
We present a three-dimensional, time-dependent simulation of a laboratory-scale rod-stabilized premixed turbulent V-flame. The experimental parameters correspond to a turbulent Reynolds number, Ret = 40, and to a Damköhler number, Da = 6. The simulations are performed using an adaptive time-dependent low-Mach-number model with detailed chemical kinetics and
National Academy of Sciences.