Liftoff and blowoff of a diffusion flame between parallel streams of fuel and air

Fernández-Tarrazo, Eduardo; Vera, Marcos; Liñán, A.

doi:10.1016/j.combustflame.2005.07.012

Cited by 39 publications

(36 citation statements)

References 48 publications

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“…The mixture fraction used in (10) changes due to differential diffusion effects as one moves across the premixed flame, although the value of Z that exists upstream in the fresh mixture is recovered as one approaches equilibrium downstream. Since the reaction zone tends to be located near the high-temperature equilibrium side of the flame, the error introduced when using Z to determine the local values of the model parameters is not too large, thereby justifying the use of (10) also for fuels different from methane [1,2]. and temperature profiles across the flame.…”

Section: Nonuniform Mixturesmentioning

confidence: 99%

“…With unity Lewis numbers, one can use the mixture fraction variable Z, defined to be unity in the fuel stream and zero in the oxidizer stream. The equation [1,2] 32(n+m/4)r Cy| H iy| ,F Z \2n-\-m YQ 2 A 1 -Z'…”

Section: Nonuniform Mixturesmentioning

confidence: 99%

“…For many purposes, one does not require the level of detailed information that can be extracted from a detailed chemistry computation, so that the lower computational cost of a simpler chemistry description is preferred. This type of approach is adopted, for instance, in two recent works, a DNS analysis of imperfectly premixed combustion [1] and a numerical description of diffusion-flame liftoff and blowoff [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A simple one-step chemistry model for partially premixed hydrocarbon combustion

Fernández-Tarrazo

Sánchez

Liñán³

et al. 2006

Combustion and Flame

148

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Section: Nonuniform Mixturesmentioning

confidence: 99%

Section: Nonuniform Mixturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A simple one-step chemistry model for partially premixed hydrocarbon combustion

Fernández-Tarrazo

Sánchez

Liñán³

et al. 2006

Combustion and Flame

148

View full text Add to dashboard Cite

“…Although the curve E/F/SL = /(Da) could be determined numerically for realistic cases following a procedure similar to that described in [51], in the limit of strong vortices that we consider here the precise shape of this curve is not critical, since the convection velocity imposed by the vortex ring is typically large compared to the edge propagation velocity along the stoichiometric surface, Iu s | S> f/ F , and therefore the exact shape of the curve E/F/SL = /(Da) is anticipated to have little impact on the numerical results.…”

Section: Flame-edge Dynamicsmentioning

confidence: 99%

On the dynamics of flame edges in diffusion-flame/vortex interactions

Hermanns

Vera

Liñán

2007

Combustion and Flame

Self Cite

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We analyze the local flame extinction and reignition of a counterflow diffusion flame perturbed by a laminar vortex ring. Local flame extinction leads to the appearance of flame edges separating the burning and extinguished regions of the distorted mixing layer. The dynamics of these edges is modeled based on previous numerical results, with heat release effects fully taken into account, which provide the propagation velocity of triple and edge flames in terms of the upstream unperturbed value of the scalar dissipation. The temporal evolution of the mixing layer is determined using the classical mixture fraction approach, with both unsteady and curvature effects taken into account. Although variable density effects play an important role in exothermic reacting mixing layers, in this paper the description of the mixing layer is carried out using the constant density approximation, leading to a simplified analytical description of the flow field. The mathematical model reveals the relevant nondimensional parameters governing diffusion-flame/vortex interactions and provides the parameter range for the more relevant regime of local flame extinction followed by reignition via flame edges. Despite the simplicity of the model, the results show very good agreement with previously published experimental results.

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“…The turbulent Liquefied Petroleum Gas (LPG) was known as having the feature of inverse diffusion flame stabilization in a back-step burner according to the dual flame structure, the visible flame length, the temperature distribution of the centerline, and the concentration of oxygen. Fernández et al [12] conducted a numerical research on the lift-off and blowout of methane flame jet diffusion of parallel streams of methane diluted with air and nitrogen. Meunier et al [13] examined NOx emission from flames of turbulent propane diffusions.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames

Namazian

Hashemi

Namazian

2016

Archive of Mechanical Engineering

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In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence flow, k-ε model is used. In contrast to the previous works, in this study, in each one of simulations the properties of materials are taken variable and then the results are compared. The results show that at a certain flow rate of fuel, by increasing the air velocity, similar to when the properties are constant, the width of the flame becomes thinner and the maximum temperature is higher; the penetration of oxygen into the fuel as well as fuel consumption is also increased. It is noteworthy that most of the pollutants produced are NOx, which are strongly temperature dependent. The amount of these pollutants rises when the temperature is increased. As a solution, decreasing the air velocity can decrease the amount of these pollutants. Finally, comparing the result of this study and the other work, which considers constant properties, shows that the variable properties assumption leads to obtaining more exact solution but the trends of both results are similar.

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Liftoff and blowoff of a diffusion flame between parallel streams of fuel and air

Cited by 39 publications

References 48 publications

A simple one-step chemistry model for partially premixed hydrocarbon combustion

A simple one-step chemistry model for partially premixed hydrocarbon combustion

On the dynamics of flame edges in diffusion-flame/vortex interactions

Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames

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