Impact of pressure fluctuations on the dynamics of laminar premixed flames

Beardsell, Guillaume; Blanquart, Guillaume

doi:10.1016/j.proci.2018.07.125

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…The effect of pressure on premixed flames have also been studied experimentally [21] and numerically [22]. Detailed chemical mechanisms have also been used to study premixed flame -acoustics coupling [23] [24]. Velocity coupling was analyzed theoretically, and transfer function was derived for weakly cellular flames [25] based on effect of hydrodynamics and diffusion on premixed flame stability [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of secondary acoustic instability of downward propagating flames: Higher modes and growth rates

Dubey

Koyama

Hashimoto

et al. 2019

Combustion and Flame

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Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of secondary acoustic instability of downward propagating flames: Higher modes and growth rates

Dubey

Koyama

Hashimoto

et al. 2019

Combustion and Flame

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“…The Mach-number value for Eq. ( 22) is very small and this equation has been ignored in the previous researches (Schmidt and Jiménez 2010;Beardsell and Blanquart 2019) .…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

“…where a is the thermal diffusivity and SL is the laminar flame speed. The flame thickness length scale lf is defined as (Beardsell and Blanquart 2019):…”

Section: Non-dimensional Parametersmentioning

confidence: 99%

“…(Laverdant and Thevenin 2003), studied the effects of Gaussian acoustic waves on a turbulent non-premixed Hydrogen flame and concluded that H2O2 and HO2 have almost no effect, while H2, O2 and most importantly H2O amplify the acoustic waves, and that H* is the primary contributor to the dissipation of the acoustic waves. (Beardsell and Blanquart, 2019) calculated the interactions of acoustic waves with a laminar premixed Methane-Air flame. By plotting the maximum amounts for chemical species mass fractions, they studied the effects of each species.…”

Section: Heat-release-rate Fluctuations Of Chemical Speciesmentioning

confidence: 99%

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Numerical Investigation of the Effects of Chemical Species and Chemical Kinetic Mechanisms on Laminar Premixed Flame-Acoustic Wave Interactions

2023

JAFM

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Numerical simulation of interactions between acoustic waves and flames is of utmost importance in thermo-acoustic instability research. In this study, interactions between a one-dimensional Methane-Air laminar premixed flame and acoustic waves with a frequency of 50 to 50000 Hz are simulated by simultaneously solving the equations for energy conservation, chemical species transport, state and continuity in one-dimensional space. By assuming that the flame thickness is smaller than the acoustic wavelength, the spatial pressure fluctuations can be neglected and the flame experiences only a time-varying acoustic pressure. The GRI mechanisms, as well as their reduced mechanisms, are considered to obtain results for steady flames without acoustic waves, and the interaction of unsteady flames with acoustic waves. Results show that the total heat-release-rate fluctuations for the flame is affected by increasing the frequency of the acoustic wave. An increase in frequency first increases the total heat released, and then decreases it. The obtained results are in good agreement with those of other researchers. Furthermore, at the presence of acoustic waves, various chemical species can affect the total heat-release-rate fluctuations. With Rayleigh's instability criterion, it can be shown that H2O, CO2 and O2 are the main species to the fluctuations of the total heat release rate and lead to flame instability. Results show that heat-release-rate of H2O specie is the most important on the total heat-release-rate. Therefore, for the flame-acoustic waves interaction problem, the best mechanism is the one that could predict the concentration of H2O more precisely.

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Flame–Acoustic Interaction: Thermoacoustic and Parametric Instabilities

Liberman¹

2021

Combustion Physics

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Impact of pressure fluctuations on the dynamics of laminar premixed flames

Cited by 7 publications

References 20 publications

Experimental and theoretical study of secondary acoustic instability of downward propagating flames: Higher modes and growth rates

Experimental and theoretical study of secondary acoustic instability of downward propagating flames: Higher modes and growth rates

Numerical Investigation of the Effects of Chemical Species and Chemical Kinetic Mechanisms on Laminar Premixed Flame-Acoustic Wave Interactions

Flame–Acoustic Interaction: Thermoacoustic and Parametric Instabilities

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