Combined effects of heat loss and curvature on turbulent flame-wall interaction in a premixed dimethyl ether/air flame

Kaddar, Driss; Steinhausen, Matthias; Zirwes, Thorsten; Bockhorn, Henning; Hasse, Christian; Ferraro, Federica

doi:10.1016/j.proci.2022.08.060

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…The entrained flame elements, as shown in Fig. 16c, can occur due to vortical motion at the tip of the quenched flame which can entrain the burned products closer to the wall than the unburned reactants, which was mentioned in a recent analysis (Kaddar et al, 2022). The probabilities of 𝑐𝑜𝑠𝛽 at the normalised wall normal distance 𝑃𝑒 = 𝑦/𝛿 𝑍 of the 𝜃 * = 0.75 isosurface for turbulent V-flames at 𝑥 ℎ ⁄ = 12,14 and 16 are shown in Fig.…”

Section: Effects Of 𝑳𝒆 𝑭 On Heat Flux Statistics Conditional On Flame...mentioning

confidence: 82%

Effects of fuel Lewis number on wall heat transfer during oblique flame-wall interaction of premixed flames within turbulent boundary layers

Ghai

Chakraborty

Ahmed

2023

Preprint

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The influence of fuel Lewis number LeF on the statistical behaviour of wall heat flux and flame quenching distance have been analysed using Direct Numerical Simulation (DNS) data for the turbulent V-shaped flame-wall interaction in a channel flow configuration corresponding to a friction velocity-based Reynolds number of 110 for fuel Lewis number, LeF, ranging from 0.6 to 1.4. It has been found that the maximum wall heat flux magnitude in turbulent V-shaped flame-wall interaction increases with decreasing LeF but just the opposite trend was observed for 2D laminar V-shaped flame-wall interaction and 1D laminar head-on quenching cases. This behaviour has been explained in terms of the correlation of temperature and fuel reaction rate magnitude with local flame surface curvature for turbulent flames due to the thermo-diffusive effects induced by the non-unity Lewis number. The wall heat flux magnitude and wall shear stress magnitude are found to be negatively correlated for all cases considered here. Moreover, their mean variations in the streamwise direction are qualitatively different irrespective of LeF, although the magnitudes of wall heat flux and wall shear stress increase with decreasing LeF. Furthermore, the flame alignment relative to the wall also affects the wall heat flux and it has been found that local occurrences of head-on quenching can lead to higher magnitudes of wall heat flux magnitude. It has been found that LeF also affects the evolution of the flame quenching distance in the streamwise direction with the progress of flame quenching for different flame normal orientations with respect to the wall. This analysis shows that the effects of fuel Lewis number on flame orientation, correlations of reaction rate and temperature with local flame curvature and coherent flow structures within turbulent boundary layer ultimately affect the wall heat transfer and flame quenching distance. Thus, the thermo-diffusive effects arising from the non-unity Lewis number need to be taken into account for accurate modelling of wall heat transfer during flame-wall interaction in turbulent boundary layers.

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Section: Effects Of 𝑳𝒆 𝑭 On Heat Flux Statistics Conditional On Flame...mentioning

confidence: 82%

Effects of fuel Lewis number on wall heat transfer during oblique flame-wall interaction of premixed flames within turbulent boundary layers

Ghai

Chakraborty

Ahmed

2023

Preprint

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“…The 2D SWQ case is well-established [30][31][32] and includes two essential flame regimes: an unstretched adiabatic flame regime and a non-adiabatic flame quenching at the wall. Even when ignoring unsteady [33] or turbulent effects [34,35] standard flamelet models fail to capture some physics, as discussed by Efimov et al [36]. Significant modeling efforts were required to develop advanced flamelet models that can accurately predict the pollutant formation, specifically CO [31,36].…”

Section: Introductionmentioning

confidence: 99%

Application of dense neural networks for manifold-based modeling of flame-wall interactions

Bissantz¹,

Karpowski²,

Steinhausen³

et al. 2023

Applications in Energy and Combustion Science

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“…10 Such interesting investigations have been going on up until now, involving additional configurations and aspects as well as a variety of fuels. 11,12 Even more relevant for the present investigations are flames propagating in narrow channels. Corresponding publications and results presented therein point to the very rich physics of the flame front when propagating in such a channel, see, for instance, Refs.…”

Section: Introductionmentioning

confidence: 99%

Toward pore-scale simulation of combustion in porous media using a low-Mach hybrid lattice Boltzmann/finite-difference solver

Hosseini

Thévenin

2023

Physics of Fluids

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A hybrid numerical model previously developed for combustion simulations is extended in this article to describe flame propagation and stabilization in porous media. The model, with a special focus on flame/wall interaction processes, is validated via corresponding benchmarks involving flame propagation in channels with both adiabatic and constant-temperature walls. Simulations with different channel widths show that the model can correctly capture the changes in flame shape and propagation speed as well as the dead zone and quenching limit, as found in channels with cold walls. The model is further assessed considering a pseudo two-dimensional porous burner involving an array of cylindrical obstacles at constant temperature, investigated in a companion experimental study. Furthermore, the model is used to simulate pore-scale flame dynamics in a randomly generated three-dimensional porous media. Results are promising, opening the door for future simulations of flame propagation in realistic porous media.

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Combined effects of heat loss and curvature on turbulent flame-wall interaction in a premixed dimethyl ether/air flame

Cited by 12 publications

References 25 publications

Effects of fuel Lewis number on wall heat transfer during oblique flame-wall interaction of premixed flames within turbulent boundary layers

Effects of fuel Lewis number on wall heat transfer during oblique flame-wall interaction of premixed flames within turbulent boundary layers

Application of dense neural networks for manifold-based modeling of flame-wall interactions

Toward pore-scale simulation of combustion in porous media using a low-Mach hybrid lattice Boltzmann/finite-difference solver

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