Determining the global activation energy of methane–air premixed flames

Moroshkina, Anastasia D.; Ponomareva, Alina A.; Mislavskii, Vladimir V.; Sereshchenko, Evgeniy V.; Gubernov, Vladimir V.; Bykov, Viatcheslav V.; Minaev, Sergey S.

doi:10.1080/13647830.2023.2245380

Cited by 3 publications

(6 citation statements)

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“…The activation energy, E a , and correlation factor, A, can then be obtained from the slope and intersection point with the ordinate axis of the graph of the linear function: ln Ṁ(−1/(2RT f )), correspondingly. Note that the linearity of this dependence was also repeatedly confirmed in numerical simulations with detailed reaction mechanisms [55]. The experimental algorithm can be thus summarised as follows: for each mixture composition, given the mass flow rate of the mixture and the ambient conditions, the flame front temperature, T f , is determined by measuring the dependence of gas temperature, T, on the distance, x, from the surface of the burner.…”

Section: Methodology For Determining the Activation Energymentioning

confidence: 82%

“…This work is a continuation of the study presented in [55], where the activation energy of a methane-air mixture was measured. The main methods for determining the activation energy can be found there; only a brief description of them is given below.…”

Section: Methodology For Determining the Activation Energymentioning

confidence: 85%

“…As shown in [55,57,58], the increase in the mass flow rate at certain fresh mixture compositions leads to flame blow-off at Ṁ = Ṁcr . As Ṁ approaches the critical value, the burner-stabilised flame tends towards a freely propagating combustion wave.…”

Section: Methodology For Determining the Activation Energymentioning

confidence: 89%

“…The main methods for determining the activation energy can be found there; only a brief description of them is given below. The basic idea in determining the activation energy is that, in [53,[55][56][57], an analytical dependence of the mass flow rate of the fresh mixture on the flame burned temperature was obtained for the case of a flame stabilised on the surface of a flat porous burner. In dimensional quantities, this correlation can be written as follows:…”

Section: Methodology For Determining the Activation Energymentioning

confidence: 99%

“…As described in [55], for a given fresh mixture composition (φ, α), the flame front temperature, T f , is measured for a set of mass flow rates, Ṁ, in a range between the critical values corresponding to the blow-off and the onset of pulsations arising due to the diffusive-thermal pulsating instabilities at sufficiently low flow rates when the flame approaches the burner surface. In this range, the flame is flat and stable.…”

Section: Methodsmentioning

confidence: 99%

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Activation Energy of Hydrogen–Methane Mixtures

Moroshkina,

Ponomareva,

Mislavskii

et al. 2024

Fire

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In this work, the overall activation energy of the combustion of lean hydrogen–methane–air mixtures (equivalence ratio φ = 0.7−1.0 and hydrogen fraction in methane α=0, 2, 4) is experimentally determined using thin-filament pyrometry of flames stabilised on a flat porous burner under normal conditions (p=1 bar, T = 20 °C). The experimental data are compared with numerical calculations within the detailed reaction mechanism GRI3.0 and both approaches confirm the linear correlation between mass flow rate and inverse flame temperature predicted in the theory. An analysis of the numerical and experimental data shows that, in the limit of lean hydrogen–methane–air mixtures, the activation energy approaches a constant value, which is not sensitive to the addition of hydrogen to methane. The mass flow rate for a freely propagating flame and, thus, the laminar burning velocity, are measured for mixtures with different hydrogen contents. This mass flow rate, scaled over the characteristic temperature dependence of the laminar burning velocity for a one-step reaction mechanism, is found and it can also be used in order to estimate the parameters of the overall reaction mechanisms. Such reaction mechanisms will find implementation in the numerical simulation of practical combustion devices with complex flows and geometries.

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Section: Methodology For Determining the Activation Energymentioning

confidence: 82%

Section: Methodology For Determining the Activation Energymentioning

confidence: 85%