Autoignition of turbulent non-premixed flames investigated using direct numerical simulations

Hilbert, R.F.; Thévenin, Dominique

doi:10.1016/s0010-2180(01)00330-3

Cited by 131 publications

(69 citation statements)

References 14 publications

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“…First, a suitable definition for the ignition delay time for these one-dimensional configurations must be given. A detailed discussion on this subject can be found in Hilbert and Thévenin (2002). As suggested by the authors, it is convenient to work with the total heat release, defined as:q…”

Section: Lmi Resultsmentioning

confidence: 99%

“…For the hydrogen case, the conditions of Hilbert and Thévenin (2002) conditions is equal to z st = 0.56. Contrary to Hilbert and Thévenin (2002), the kinetic reaction mechanism of Yetter et al (1991) is used here for the hydrogen case.…”

Section: Hydrogen Flamementioning

confidence: 99%

“…Contrary to Hilbert and Thévenin (2002), the kinetic reaction mechanism of Yetter et al (1991) is used here for the hydrogen case. This mechanism has been used successfully in other ignition studies (see for example Im et al 1998;Kreutz and Law 1996).…”

Section: Hydrogen Flamementioning

confidence: 99%

“…More complex configurations can also be used, for example in DNS of turbulent mixing ignition (Hilbert and Thévenin 2002;Im et al 1998;Mastorakos et al 1997). But the LMI is of special interest because of its simplicity and because it satisfies the criteria mentioned above: laminar mixing is accurately predicted, no equi-diffusive assumption is required and global ignition can be studied.…”

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confidence: 99%

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Comparison of computational methodologies for ignition of diffusion layers

Knikkerr

Dauptain

Cuenot

et al. 2003

Combustion Science and Technology

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The prediction of the auto-ignition delay time of fresh fuel in hot air is studied.This problem, encountered in many combustion systems, is in practice often calculated using a simple method, hereafter called homogeneous mixing ignition (HMI).This method however neglects transport effects and calculates local instead of global ignition properties. A second method is therefore studied called linear mixing ignition (LMI) and consists of the direct simulation of a one-dimensional mixing layer.This method is tested in a hydrogen and methane fuel configuration using detailed and reduced chemistry mechanisms. The results indicate that molecular transport increases the ignition delay, for the methane fuel by about a factor three, but this effect is compensated in the hydrogen case by the small Lewis number of the fuel.Such detailed information is not provided by the HMI method and the LMI approach appears therefore as a minimum requirement for the correct estimation of the ignition delay time.

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Section: Lmi Resultsmentioning

confidence: 99%

Section: Hydrogen Flamementioning

confidence: 99%

Section: Hydrogen Flamementioning

confidence: 99%

mentioning

confidence: 99%

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Comparison of computational methodologies for ignition of diffusion layers

Knikkerr

Dauptain

Cuenot

et al. 2003

Combustion Science and Technology

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“…The full compressible governing equations together with considered thermodynamical relations, chemistry and transport models are solved using the parallel DNS flame solver, Parcomb [39,40]. Using the Cartesian tensor notation and ignoring all external forces, the conservation equations solved in DNS read:…”

Section: Governing Equations Chemistry and Diffusion Modelmentioning

confidence: 99%

High hydrogen content syngas fuel burning in lean premixed spherical flames at elevated pressures: Effects of preferential diffusion

Dinesh

Shalaby

Luo

et al. 2016

International Journal of Hydrogen Energy

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This study addresses the effects of preferential diffusion on flame structure and propagation of high hydrogen content (HHC) turbulent lean premixed hydrogen-carbon monoxide syngas flames at elevated pressures. The direct numerical simulations with detailed chemistry were performed in three-dimensional domain for expanding spherical flame configuration in a constant pressure combustion chamber. To identify the role of preferential diffusion on flame structure and propagation under low and high turbulence levels at elevated pressure, simulations were performed at an initial turbulent Reynolds number of 15 and 150 at a pressure value of 4bar. The results demonstrate that the thermo-diffusive instability greatly influences the lean premixed syngas cellular flame structure due to strong preferential diffusion effects under low turbulence level at elevated pressure. In contrast, the results reveal that the thermo-diffusive effects are destabilising and preferential diffusion is overwhelmed by turbulent mixing under high turbulence level at elevated pressure. This finding suggests that the development of cellular flame structure is dominated by turbulence with little or no contribution from the thermo-diffusive instability for the lean premixed syngas flame which operates under conditions of high turbulence and elevated pressures. However, results demonstrate that the flame acceleration and species diffusive flux are still influenced by the preferential diffusion for the lean premixed syngas flame which operates under conditions of high turbulence and elevated pressures.

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Simulation of Three-Dimensional Turbulent Flames

Thévenin¹

2004

Direct and Large-Eddy Simulation V

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Autoignition of turbulent non-premixed flames investigated using direct numerical simulations

Cited by 131 publications

References 14 publications

Comparison of computational methodologies for ignition of diffusion layers

Comparison of computational methodologies for ignition of diffusion layers

High hydrogen content syngas fuel burning in lean premixed spherical flames at elevated pressures: Effects of preferential diffusion

Simulation of Three-Dimensional Turbulent Flames

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