Perfectly stirred reactor model to evaluate extinction of diffusion flame

Snegirev, A. Yu.

doi:10.1016/j.combustflame.2015.06.019

Cited by 43 publications

(9 citation statements)

References 34 publications

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“…Available models used to describe flame extinction in fire problems are based on the concepts of a critical flame temperature [1,2] or a critical flame Damköhler number [3][4][5][6][7]. Models based on the concept of a critical flame temperature choose to ignore the importance of chemical time scales and are not consistent with known laminar flame phenomenology [8].…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Vilfayeau

White

Sunderland

et al. 2016

Fire Safety Journal

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The general objective of this project is to support the development and validation of large eddy simulation (LES) models used to simulate the response of fires to the activation of suppression systems. The focus here is on suppression by gaseous agents. The present experimental configuration is a two-dimensional, plane, buoyancy-driven, methane-fueled, turbulent diffusion flame with a controlled co-flow. The co-flow is an air-nitrogen mixture with variable oxygen dilution conditions, including conditions that lead to full flame extinction. Experimental measurements include the global combustion efficiency and global radiative loss fraction. The numerical simulations are performed with a LESbased fire model developed by FM Global and called FireFOAM. In this study, FireFOAM is modified to include a flame extinction model based on the concept of a critical flame Damköhler number and a flame reignition model based on the concept of a critical gas temperature. The numerical simulations are found to successfully reproduce the rapid change that is observed experimentally when exposing the flame to a co-flow with decreasing oxygen strength: the change corresponds to an abrupt transition from a strong flame with a global combustion efficiency close to one to a residual flame with a global combustion efficiency close to zero.

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Section: Introductionmentioning

confidence: 99%

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Vilfayeau

White

Sunderland

et al. 2016

Fire Safety Journal

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“…The temperature curve of p is very close because of the approximate lower heat value. In order to predict the extinction of the PODE 3-4 /CH 4 mixture flame, a perfectly stirred reactor (PSR) model [43] is introduced in this research. The PSR model structures the turbulent intensity of inner gas as flow speed and regulates it by the residence time.…”

Section: Psr Simulation Of Pode3-4/ch4 Mixturementioning

confidence: 99%

Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions

Leng,

Ji,

Zhang

et al. 2024

Fuels

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Polyoxymethylene dimethyl ether (PODEn, n ≥ 1) is a promising alternative fuel to diesel with higher reactivity and low soot formation tendency. In this study, PODE3-4 is used as a pilot ignition fuel for methane (CH4) and the combustion characteristics of PODE3-4/CH4 mixtures are investigated numerically using an updated PODE3-4 mechanism. The ignition delay time (IDT) and laminar burning velocity (LBV) of PODE3-4/CH4 blends were calculated at high temperature and high pressure relevant to engine conditions. It is discovered that addition of a small amount of PODE3-4 has a dramatic promotive effect on IDT and LBV of CH4, whereas such a promoting effect decays at higher PODE3-4 addition. Kinetic analysis was performed to gain more insight into the reaction process of PODE3-4/CH4 mixtures at different conditions. In general, the promoting effect originates from the high reactivity of PODE3-4 at low temperatures and it is further confirmed in simulations using a perfectly stirred reactor (PSR) model. The addition of PODE3-4 significantly extends the extinction limit of CH4 from a residence time of ~0.5 ms to that of ~0.08 ms, indicating that the flame stability is enhanced as well by PODE3-4 addition. It is also found that NO formation is reduced in lean or rich flames; moreover, NO formation is inhibited by too short a residence time.

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“…The basis for our calculations is the model proposed in [43]. This model relies on correspondence between the original stationary diffusion combustion problem and the simpler problem of a stoichiometric well-mixed combustion (stoichiometry condition follows from the Shvab-Zeldovich approximation).…”

Section: Fig 4 Co2 Pellet Decomposition For Varying Evaporation Heat:...mentioning

confidence: 99%

Dissociation of Gas Hydrates in the Combustion Environment

Donskoy

2024

Energy Systems Research

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This paper proposes mathematical models of gas hydrate decomposition in high-temperature media. These models are based on heat and mass balances with a set of assumptions about transfer mechanisms and features of chemical reactions. The calculations provide an insight into dynamics of hydrate particles in a flame environment and shed light on possible results of interaction between the combustion front and emission of gas and vapor. Several examples are provided to illustrate the potential of hydrates as a fuel and as a flame extinguishing material. The developed models enable the generation of numerical estimates, which can be employed to design technologies for beneficial uses of gas hydrates.

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Perfectly stirred reactor model to evaluate extinction of diffusion flame

Cited by 43 publications

References 34 publications

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Numerical Study of Premixed PODE3-4/CH4 Flames at Engine-Relevant Conditions

Dissociation of Gas Hydrates in the Combustion Environment

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