Edge flame structure in a turbulent lifted flame: A direct numerical simulation study

Karami, Shahram; Hawkes, Evatt R.; Talei, Mohsen; Chen, Jacqueline H.

doi:10.1016/j.combustflame.2016.03.006

Title: Edge flame structure in a turbulent lifted flame: A direct numerical simulation study

Journal Article · Sun May 08 00:00:00 EDT 2016 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.03.006· OSTI ID:1497642

Karami, Shahram ^[1]; Hawkes, Evatt R. ^[2]; Talei, Mohsen ^[3]; Chen, Jacqueline H. ^[4]

Univ. of New South Wales, Sydney, NSW (Australia). School of Photovoltaic and Renewable Energy Engineering
Univ. of New South Wales, Sydney, NSW (Australia). School of Mechanical and Manufacturing Engineering. School of Photovoltaic and Renewable Energy Engineering
Univ. of Melbourne (Australia). Dept. of Mechanical Engineering
Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility

This paper presents here a statistical analysis of edge flames in a turbulent lifted flame using direct numerical simulation (DNS). To investigate the dynamics of edge flames, a theoretical framework describing the edge-flame propagation velocity as a function of propagation velocities of mixture-fraction and product-mass fraction iso-surfaces at the flame base is used. The correlations between these propagation velocities and several other variables are then studied, including iso-surface curvatures, iso-surface orientations, strain rates, scalar dissipation rate and gradients of product mass fraction. The contribution of these parameters to the overall behaviour of the edge flame is also investigated using conditional averaging on two-dimensional spatial locations at the flame base. The analysis reveals that the tangential and normal strain rates in addition to the curvatures and scalar dissipation rates have significant contributions to the overall behaviour of the edge flame. The elliptical motion of the flame base described in our earlier study is extended to provide a clearer picture of how these various parameters affect the large fluctuations of edge-flame velocity observed at the flame base.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of New South Wales, Sydney, NSW (Australia)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Australian Research Council

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1497642

Alternate ID(s):: OSTI ID: 1324337

Report Number(s):: SAND2015-7323J; 672301

Journal Information:: Combustion and Flame, Vol. 169; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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Karami, Shahram; Hawkes, Evatt R.; Talei, Mohsen; +1 more

Three-dimensional direct numerical simulation of a turbulent lifted hydrogen jet flame in a heated coflow: flame stabilization and structure

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Journal of Fluid Mechanics · OSTI ID:1497642

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Three-dimensional direct numerical simulation of a turbulent lifted hydrogen jet flame in heated coflow: flame stabilization and structure

Journal Article · Wed Dec 02 00:00:00 EST 2009 · Journal of Fluid Mechanics · OSTI ID:1497642

YOO, C. S.; SANKARAN, R.; CHEN, J. H.

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42 ENGINEERING
lifted flame
edge flame
DNS
curvature
strain rate
scalar dissipation rate

Title: Edge flame structure in a turbulent lifted flame: A direct numerical simulation study

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