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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of New South Wales, Sydney, NSW (Australia). School of Photovoltaic and Renewable Energy Engineering
  2. Univ. of New South Wales, Sydney, NSW (Australia). School of Mechanical and Manufacturing Engineering. School of Photovoltaic and Renewable Energy Engineering
  3. Univ. of Melbourne (Australia). Dept. of Mechanical Engineering
  4. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of New South Wales, Sydney, NSW (Australia)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Australian Research Council
OSTI Identifier:
1497642
Alternate Identifier(s):
OSTI ID: 1324337
Report Number(s):
SAND2015-7323J
Journal ID: ISSN 0010-2180; 672301
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 169; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; lifted flame; edge flame; DNS; curvature; strain rate; scalar dissipation rate

Citation Formats

Karami, Shahram, Hawkes, Evatt R., Talei, Mohsen, and Chen, Jacqueline H. Edge flame structure in a turbulent lifted flame: A direct numerical simulation study. United States: N. p., 2016. Web. doi:10.1016/j.combustflame.2016.03.006.
Karami, Shahram, Hawkes, Evatt R., Talei, Mohsen, & Chen, Jacqueline H. Edge flame structure in a turbulent lifted flame: A direct numerical simulation study. United States. doi:10.1016/j.combustflame.2016.03.006.
Karami, Shahram, Hawkes, Evatt R., Talei, Mohsen, and Chen, Jacqueline H. Sun . "Edge flame structure in a turbulent lifted flame: A direct numerical simulation study". United States. doi:10.1016/j.combustflame.2016.03.006. https://www.osti.gov/servlets/purl/1497642.
@article{osti_1497642,
title = {Edge flame structure in a turbulent lifted flame: A direct numerical simulation study},
author = {Karami, Shahram and Hawkes, Evatt R. and Talei, Mohsen and Chen, Jacqueline H.},
abstractNote = {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.},
doi = {10.1016/j.combustflame.2016.03.006},
journal = {Combustion and Flame},
number = ,
volume = 169,
place = {United States},
year = {2016},
month = {5}
}

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Cited by: 5 works
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