Quenching of laminar iso-octane flames at cold walls

Hasse, Christian; Bollig, Marcus; Peters, N.; Dwyer, H. A.

doi:10.1016/s0010-2180(00)00107-3

Cited by 99 publications

(62 citation statements)

References 21 publications

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“…Heat diffusion process dominates this last step. These results are similar to descriptions made by [41,24,16].…”

Section: Head-on Quenchingsupporting

confidence: 93%

“…It has been described in [24]. It is based on the Peters mechanism composed of 56 species and 189 reactions.…”

Section: Chemical Kineticsmentioning

confidence: 99%

“…Moreover the flame is unsteady. Previous studies [43,24,16] have grid spacing of the order of micrometers. In addition, a length of 1 cm for the computational domain is enough to ensure that the influence of the open boundary on the quenching process is negligible [24].…”

Section: Head-on Quenchingmentioning

confidence: 99%

“…Parallely, the wall heat flux increases until it reaches a maximum at the same time t * = 0. In table 2 Peclet numbers and wall heat fluxes are compared to Hasse's results [24] for various wall temperatures. Peclet numbers are almost similar for both computations and wall heat fluxes are very close.…”

Section: Head-on Quenchingmentioning

confidence: 99%

“…These fuels have limited pathways of forming HC during the combustion. Concerning fuels with more important molecular weight, which have more HC pathways formations, it has been shown [24,31] that the quantity of total HC exceed the quantity of pure fuel. Consequently, it is preferable to use a complex chemistry that takes into account several pathways of forming HC and interactions between transport and oxidation in the gas.…”

mentioning

confidence: 99%

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Flame/Wall Interactions: Laminar Study of Unburnt HC Formation

Chauvy

Delhom

Réveillon

et al. 2010

Flow Turbulence Combust

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This work presents a numerical study dedicated to the formation of unburnt hydrocarbon. Two configurations: head-on quenching (HOQ) on a planar wall and in crevices, are considered. It is well known that they contribute for an important part to the sources of hydrocarbon (HC) emission in a combustion chamber. The aim of this work is to use laminar flame simulations (LFS) to understand how the unburnt HC are produced near walls in gasoline engine. A skeletal mechanism (29 species and 48 reactions) mimicking iso-octane combustion is used. In the HOQ configuration, the flame front propagates toward the cold wall where quenching occurs. The numerical procedure and the chemical scheme used in this study are first validated by comparisons with literature results for the 1D case. Several aspects of flame wall quenching such as oxidation of unburnt HC, wall heat flux, quench distances as well as HC families are investigated by varying parameters like wall temperature and equivalence ratio. In a second part, crevices are considered to study the impact of wall imperfections in combustion chambers. Configurations with different geometrical and thermodynamic properties are tested. It leads to a wide range of flame properties and HC production modes. When incomplete combustion occurs, total HC (fuel + HC) concentration can reach very high levels at the wall. When the crevice is not wide enough, the flame cannot propagate and the quantity of HC is smaller than in the case where the flame can propagate (but the fuel is not oxidizing). If the crevice is wide enough for the flame to propagate, HOQ occurs at 1 the bottom of the crevice and HC accumulate in the corners. The computational results obtained in this work demonstrate the ability of LFS to reproduce incomplete combustion mechanisms that are responsible for a major part of HC production in gasoline engines.

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“…Heat diffusion process dominates this last step. These results are similar to descriptions made by [41,24,16].…”

Section: Head-on Quenchingsupporting

confidence: 93%

“…It has been described in [24]. It is based on the Peters mechanism composed of 56 species and 189 reactions.…”

Section: Chemical Kineticsmentioning

confidence: 99%

Section: Head-on Quenchingmentioning

confidence: 99%

Section: Head-on Quenchingmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Flame/Wall Interactions: Laminar Study of Unburnt HC Formation

Chauvy

Delhom

Réveillon

et al. 2010

Flow Turbulence Combust

View full text Add to dashboard Cite

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Effects of Residual Burnt Gas Heterogeneity on Cyclic Variability in Lean-burn SI Engines

Pera

Knop

Chevillard

et al. 2014

Flow Turbulence Combust

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Computational Investigation of Weakly Turbulent Flame Kernel Growths in Iso-Octane Droplet Clouds in CVC Conditions

Zhao

Bouali

Mura

2019

Flow Turbulence Combust

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Numerical simulations of turbulent flame kernel growths in monodisperse clouds of iso-octane liquid droplets are conducted in conditions relevant to constant volume combustors. The simulations make use of a low-Mach number Navier-Stokes solver and a thermodynamic pressure evolution model has been implemented to reproduce the pressure variation that may be issued from either experiments or from a standard (i.e., analytical) compression law. Chemistry is described with a representative skeletal mechanism featuring 29 species and 48 elementary reaction steps. The computational results clearly confirm the enhancement of flame propagation in constant volume combustion conditions. The impact of the droplet diameter on the turbulent flame development is scrutinized for two distinct values of the Stokes number St equal to 0.1 and 1.0. Significant influence on the flame dynamics is put into evidence. This is a direct outcome of the equivalence ratio and temperature heterogeneities, which are themselves very sensitive to the choice of the Stokes number value. Then, small-scale turbulence-scalar interactions (TSI) are studied by analyzing the fields of the scalar gradients and strain-rate. Their dynamics is investigated for both non-reactive and reactive two-phase flows conditions. The TSI analysis is performed on the basis of time evolution equations written for quantities that characterize the couplings between the velocity gradient tensor and scalar gradients vectors. Special emphasis is placed on the possible influence of mass exchange terms between the liquid and gaseous phases.

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Quenching of laminar iso-octane flames at cold walls

Cited by 99 publications

References 21 publications

Flame/Wall Interactions: Laminar Study of Unburnt HC Formation

Flame/Wall Interactions: Laminar Study of Unburnt HC Formation

Effects of Residual Burnt Gas Heterogeneity on Cyclic Variability in Lean-burn SI Engines

Computational Investigation of Weakly Turbulent Flame Kernel Growths in Iso-Octane Droplet Clouds in CVC Conditions

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