Structure of a spatially developing turbulent lean methane-air Bunsen flame

Ramanan Sankaran; Evatt R. Hawkes; Jacqueline H. Chen; Tianfeng Lu; Chung K. Law

doi:10.1016/j.proci.2006.08.025

Structure of a spatially developing turbulent lean methane-air Bunsen flame

Ramanan Sankaran, Evatt R. Hawkes, Jacqueline H. Chen, Tianfeng Lu, Chung K. Law

Research output: Contribution to journal › Conference article › peer-review

382 Scopus citations

Abstract

Direct numerical simulation of a three-dimensional spatially developing turbulent slot-burner Bunsen flame has been performed with a new reduced methane-air mechanism. The mechanism, derived from sequential application of directed relation graph theory, sensitivity analysis and computational singular perturbation over the GRI-1.2 detailed mechanism is non-stiff and tailored to the lean conditions of the DNS. The simulation is performed for three flow through times, long enough to achieve statistical stationarity. The turbulence parameters have been chosen such that the combustion occurs in the thin reaction zones regime of premixed combustion. The data is analyzed to study possible influences of turbulence on the structure of the preheat and reaction zones. The results show that the mean thickness of the turbulent flame, based on progress variable gradient, is greater than the corresponding laminar flame. The effects of flow straining and flame front curvature on the mean flame thickness are quantified through conditional means of the thickness and by examining the balance equation for the evolution of the flame thickness. Finally, conditional mean reaction rate of key species compared to the laminar reaction rate profiles show that there is no significant perturbation of the heat release layer.

Original language	English
Pages (from-to)	1291-1298
Number of pages	8
Journal	Proceedings of the Combustion Institute
Volume	31 I
Issue number	1
DOIs	https://doi.org/10.1016/j.proci.2006.08.025
State	Published - 2007
Externally published	Yes
Event	31st International Symposium on Combustion - Heidelberg, Germany Duration: Aug 5 2006 → Aug 11 2006

Funding

The work at SNL was supported by the Division of Chemical Sciences, Geosciences and Biosciences, the Office of Basic Energy Sciences (BES), the US Department of Energy (DOE) and also by the US DOE, BES, SciDAC Computational Chemistry program. The work at Princeton was supported by the Air Force Office of Scientific Research under the technical monitoring of Dr. Julian M. Tishkoff. This research used resources of the National Center for Computational Sciences (NCCS) at Oak Ridge National Laboratory (ORNL), which is supported by the Office of Science of the US Department of Energy under Contract No. DE-AC05-00OR22725. We are grateful to Mark R. Fahey of NCCS/ORNL for his computing support.

Keywords

DNS
Flame structure
Premixed
Thin reaction zone
Turbulent combustion

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10.1016/j.proci.2006.08.025

Cite this

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title = "Structure of a spatially developing turbulent lean methane-air Bunsen flame",

abstract = "Direct numerical simulation of a three-dimensional spatially developing turbulent slot-burner Bunsen flame has been performed with a new reduced methane-air mechanism. The mechanism, derived from sequential application of directed relation graph theory, sensitivity analysis and computational singular perturbation over the GRI-1.2 detailed mechanism is non-stiff and tailored to the lean conditions of the DNS. The simulation is performed for three flow through times, long enough to achieve statistical stationarity. The turbulence parameters have been chosen such that the combustion occurs in the thin reaction zones regime of premixed combustion. The data is analyzed to study possible influences of turbulence on the structure of the preheat and reaction zones. The results show that the mean thickness of the turbulent flame, based on progress variable gradient, is greater than the corresponding laminar flame. The effects of flow straining and flame front curvature on the mean flame thickness are quantified through conditional means of the thickness and by examining the balance equation for the evolution of the flame thickness. Finally, conditional mean reaction rate of key species compared to the laminar reaction rate profiles show that there is no significant perturbation of the heat release layer.",

keywords = "DNS, Flame structure, Premixed, Thin reaction zone, Turbulent combustion",

author = "Ramanan Sankaran and Hawkes, {Evatt R.} and Chen, {Jacqueline H.} and Tianfeng Lu and Law, {Chung K.}",

year = "2007",

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AU - Sankaran, Ramanan

AU - Hawkes, Evatt R.

AU - Chen, Jacqueline H.

AU - Lu, Tianfeng

AU - Law, Chung K.

PY - 2007

Y1 - 2007

N2 - Direct numerical simulation of a three-dimensional spatially developing turbulent slot-burner Bunsen flame has been performed with a new reduced methane-air mechanism. The mechanism, derived from sequential application of directed relation graph theory, sensitivity analysis and computational singular perturbation over the GRI-1.2 detailed mechanism is non-stiff and tailored to the lean conditions of the DNS. The simulation is performed for three flow through times, long enough to achieve statistical stationarity. The turbulence parameters have been chosen such that the combustion occurs in the thin reaction zones regime of premixed combustion. The data is analyzed to study possible influences of turbulence on the structure of the preheat and reaction zones. The results show that the mean thickness of the turbulent flame, based on progress variable gradient, is greater than the corresponding laminar flame. The effects of flow straining and flame front curvature on the mean flame thickness are quantified through conditional means of the thickness and by examining the balance equation for the evolution of the flame thickness. Finally, conditional mean reaction rate of key species compared to the laminar reaction rate profiles show that there is no significant perturbation of the heat release layer.

AB - Direct numerical simulation of a three-dimensional spatially developing turbulent slot-burner Bunsen flame has been performed with a new reduced methane-air mechanism. The mechanism, derived from sequential application of directed relation graph theory, sensitivity analysis and computational singular perturbation over the GRI-1.2 detailed mechanism is non-stiff and tailored to the lean conditions of the DNS. The simulation is performed for three flow through times, long enough to achieve statistical stationarity. The turbulence parameters have been chosen such that the combustion occurs in the thin reaction zones regime of premixed combustion. The data is analyzed to study possible influences of turbulence on the structure of the preheat and reaction zones. The results show that the mean thickness of the turbulent flame, based on progress variable gradient, is greater than the corresponding laminar flame. The effects of flow straining and flame front curvature on the mean flame thickness are quantified through conditional means of the thickness and by examining the balance equation for the evolution of the flame thickness. Finally, conditional mean reaction rate of key species compared to the laminar reaction rate profiles show that there is no significant perturbation of the heat release layer.

KW - DNS

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KW - Turbulent combustion

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Structure of a spatially developing turbulent lean methane-air Bunsen flame

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