The turbulent flame speed of premixed spherically expanding flames

G. K. Giannakopoulos; C. E. Frouzakis; M. Matalon; A. G. Tomboulides

doi:10.1007/978-3-319-63212-4_53

The turbulent flame speed of premixed spherically expanding flames

G. K. Giannakopoulos, C. E. Frouzakis, M. Matalon, A. G. Tomboulides

Research output: Contribution to journal › Article › peer-review

Abstract

Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field. A stoichiometric syngas-air mixture with molar ratio CO/H₂=3 is considered at conditions relevant to internal combustion engines. The dependence of the integral heat release rate on the characteristics of the flow field (integral length scale and turbulent intensity) is discussed. The long-term evolution of important global flame quantities is analyzed, and the mechanisms that dominate the growth of the flame kernel are identified. An expression for the speed of turbulent premixed spherical flames is formulated, based on the rate of change of the surface area of the flame.

Original language	English (US)
Pages (from-to)	415-421
Number of pages	7
Journal	ERCOFTAC Series
Volume	24
DOIs	https://doi.org/10.1007/978-3-319-63212-4_53
State	Published - 2018
Externally published	Yes

Keywords

Spherically expanding flame
Syngas flames
Turbulent flame speed
Turbulent premixed flame

ASJC Scopus subject areas

Fluid Flow and Transfer Processes
Computational Mathematics

Online availability

10.1007/978-3-319-63212-4_53

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title = "The turbulent flame speed of premixed spherically expanding flames",

abstract = "Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field. A stoichiometric syngas-air mixture with molar ratio CO/H2=3 is considered at conditions relevant to internal combustion engines. The dependence of the integral heat release rate on the characteristics of the flow field (integral length scale and turbulent intensity) is discussed. The long-term evolution of important global flame quantities is analyzed, and the mechanisms that dominate the growth of the flame kernel are identified. An expression for the speed of turbulent premixed spherical flames is formulated, based on the rate of change of the surface area of the flame.",

keywords = "Spherically expanding flame, Syngas flames, Turbulent flame speed, Turbulent premixed flame",

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doi = "10.1007/978-3-319-63212-4_53",

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volume = "24",

pages = "415--421",

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AU - Giannakopoulos, G. K.

AU - Frouzakis, C. E.

AU - Matalon, M.

AU - Tomboulides, A. G.

PY - 2018

Y1 - 2018

N2 - Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field. A stoichiometric syngas-air mixture with molar ratio CO/H2=3 is considered at conditions relevant to internal combustion engines. The dependence of the integral heat release rate on the characteristics of the flow field (integral length scale and turbulent intensity) is discussed. The long-term evolution of important global flame quantities is analyzed, and the mechanisms that dominate the growth of the flame kernel are identified. An expression for the speed of turbulent premixed spherical flames is formulated, based on the rate of change of the surface area of the flame.

AB - Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field. A stoichiometric syngas-air mixture with molar ratio CO/H2=3 is considered at conditions relevant to internal combustion engines. The dependence of the integral heat release rate on the characteristics of the flow field (integral length scale and turbulent intensity) is discussed. The long-term evolution of important global flame quantities is analyzed, and the mechanisms that dominate the growth of the flame kernel are identified. An expression for the speed of turbulent premixed spherical flames is formulated, based on the rate of change of the surface area of the flame.

KW - Spherically expanding flame

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KW - Turbulent flame speed

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The turbulent flame speed of premixed spherically expanding flames

Abstract

Keywords

ASJC Scopus subject areas

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