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

Fernández-Tarrazo, Eduardo; Sánchez, Antonio L.; Liñán, A.; Williams, Forman A.

doi:10.1016/j.combustflame.2006.08.001

Cited by 148 publications

(77 citation statements)

References 14 publications

(35 reference statements)

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“…This concept requires that the characteristic length scale of composition variations is much larger than the flame thickness, which is the main assumption ruling the paper. Let us remark that in [30][31] is XVHG DQRWKHU ³LQYDULDQW´which allows the authors to adapt heat release and activation energy in pace with the composition variation; the resulting one-step kinetics is implemented and checked with respect to a counter-flow diffusion flame. From the quantitative point of view, it has been shown in [2] that the following general form of the adjustable quantity F( ) and temperature 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 10 end of a rapid stage in the spray-flame propagation process (the instant of the snapshots is indicated in Fig.2 by a vertical arrow).…”

Section: General Considerationsmentioning

confidence: 99%

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Nicoli

Denet

Haldenwang

2015

Combustion and Flame

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Section: General Considerationsmentioning

confidence: 99%

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Nicoli

Denet

Haldenwang

2015

Combustion and Flame

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“…Model one-step kinetics having an Arrhenius rate with moderately large activation energy has been shown to be sufficiently accurate in numerical descriptions of extinction of methane-air flames [14].…”

Section: Discussionmentioning

confidence: 99%

“…In applications, the kinetic parameters B' and E could be selected to give a good approximation of the stoichiometric premixed-flame structure. A kinetic model of this type, including unity orders for both reactants, has been shown to be successful in describing methane combustion [14], for instance. It would be straightforward to extend the asymptotic analysis given below to reaction rates with non-unity reaction orders, as done for premixed flames in early work [15].…”

Section: Chemistry Modelmentioning

confidence: 99%

The large-activation-energy analysis of extinction of counterflow diffusion flames with non-unity Lewis numbers of the fuel

Liñán¹,

Martínez-Ruiz

Vera

et al. 2017

Combustion and Flame

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Large-activation-energy asymptotic techniques are used to describe the effects of non-unity Lewis numbers of the fuel on strain-induced extinction of axisymmetric counterflow diffusion flames. The present work extends and clarifies previous investigations by accounting also for variable density and variable transport properties of the gas. In our asymptotic analysis the flame structure near extinction is, at leading order, given by the Burke-Schumann limit of infinitely fast reaction; i.e. two outer regions of equilibrium flow, with the fuel and the oxygen separated by an infinitesimally thin reaction layer where they arrive by diffusion in stoichiometric proportions. The leading-order description provides the basic flow structure, including the flame-sheet location, the fuel-consumption rate, the temperature gradients on both sides of the flame, and the peak value of the temperature, which plays a dominant role in flame extinction and differs significantly from the adiabatic-flame value for non-unity Lewis numbers. In the near-extinction regime small departures, due to finite rates, from the fast-reaction limit are enough to dominate the structure of the reaction layer, and must be taken into account in this thin layer and in the outer chemically frozen regions, where the corrections are associated with the reactants leaking, with small mass fractions, through the flame. The main effect of the differential diffusion in the nearextinction regime is due to the strong modification of the reaction rates resulting from the changes in the Burke-Schumann peak temperature, with only moderate corrections due to leakage of the reactants through the flame. For large values of the overall stoichiometric ratio S of the diffusion flame, defined as the mass of the air stream needed to burn to completion the unit mass of the fuel stream, the extinction conditions occur in a premixed-flame regime, in which the reaction layer is displaced towards the fuel side with respect to the Burke-Schumann flame sheet position and a fraction of the arriving fuel mass flux leaks through the reaction layer, while the mass fraction of the leaking oxygen decreases to negligibly small values. The asymptotic predictions are tested by comparison with numerical integrations of extinction curves based on continuation methods.

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“…Several reduction schemes for methane oxidation under general combustion conditions [80] and lean conditions [81] were also proposed based on steady state approximation of intermediate species. A 4-step reduction scheme was first proposed and then, further reduced to a 2-step mechanism for conditions relevant to gas turbine operations.…”

Section: General Background On Combustion Chemistry For Methane Oxidamentioning

confidence: 99%

The combustion mitigation of methane as a non-CO 2 greenhouse gas

Jiang

Mira

Cluff

2018

Progress in Energy and Combustion Science

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ABSTRACT:Anthropogenic emissions of non-CO 2 greenhouse gases such as fugitive methane contribute significantly to global warming. A review of fugitive methane combustion mitigation and utilisation technologies, which are primarily aimed at methane emissions from coal mining activities, with a focus on modelling and simulation of ultra-lean methane oxidation/combustion is presented. The challenges associated with ultra-lean methane oxidation are on the ignition of the ultra-lean mixture and sustainability of the combustion process. There is a lack of fundamental studies on chemical kinetics of ultra-lean methane combustion and reliable kinetic schemes that can be used together with computational fluid dynamics studies to design and develop advanced mitigation systems. Mitigation of methane as a greenhouse gas calls for more efforts on understanding ultra-lean combustion. Recuperative combustion provides a promising means for mitigating ultra-lean methane emissions. Progress is needed on effective methods to ignite and to recuperate and retain heat for oxidation/combustion of the ultra-lean mixtures. Catalysts can be very effective in reducing the temperatures required for oxidation while plasmas may be utilised to assist the ignition, but thermodynamic/aerodynamic limits of burning ultra-lean methane remain unexplored. Further technological developments may be focussed on developing innovative capturing technology as well as technological innovations to achieve effective ignition and sustainable oxidation/combustion.

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

Cited by 148 publications

References 14 publications

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Rich spray-flame propagating through a 2DLattice of alkane droplets in air

The large-activation-energy analysis of extinction of counterflow diffusion flames with non-unity Lewis numbers of the fuel

The combustion mitigation of methane as a non-CO 2 greenhouse gas

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

Cited by 148 publications

References 14 publications

Rich spray-flame propagating through a 2D­Lattice of alkane droplets in air

Rich spray-flame propagating through a 2D­Lattice of alkane droplets in air

The large-activation-energy analysis of extinction of counterflow diffusion flames with non-unity Lewis numbers of the fuel

The combustion mitigation of methane as a non-CO 2 greenhouse gas

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Rich spray-flame propagating through a 2DLattice of alkane droplets in air

Rich spray-flame propagating through a 2DLattice of alkane droplets in air