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Title: Response of flame thickness and propagation speed under intense turbulence in spatially developing lean premixed methane–air jet flames

Abstract

In this study, direct numerical simulations of three-dimensional spatially-developing turbulent Bunsen flames were performed at three different turbulence intensities. The simulations were performed using a reduced methane–air chemical mechanism which was specifically tailored for the lean premixed conditions simulated here. A planar-jet turbulent Bunsen flame configuration was used in which turbulent preheated methane–air mixture at 0.7 equivalence ratio issued through a central jet and was surrounded by a hot laminar coflow of burned products. The turbulence characteristics at the jet inflow were selected such that combustion occured in the thin reaction zones (TRZ) regime. At the lowest turbulence intensity, the conditions fall on the boundary between the TRZ regime and the corrugated flamelet regime, and progressively moved further into the TRZ regime by increasing the turbulent intensity. The data from the three simulations was analyzed to understand the effect of turbulent stirring on the flame structure and thickness. Statistical analysis of the data showed that the thermal preheat layer of the flame was thickened due to the action of turbulence, but the reaction zone was not significantly affected. A global and local analysis of the burning velocity of the flame was performed to compare the different flames. Detailed statistical averagesmore » of the flame speed were also obtained to study the spatial dependence of displacement speed and its correlation to strain rate and curvature.« less

Authors:
 [1];  [2];  [3];  [4]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of New South Wales, Sydney (Australia)
  3. Ulsan National Inst. of Science and Technology (Korea)
  4. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1212349
Alternate Identifier(s):
OSTI ID: 1235352; OSTI ID: 1246496
Report Number(s):
SAND-2015-6891J
Journal ID: ISSN 0010-2180; KJ0502000; ERKJZN1
Grant/Contract Number:  
AC05-00OR22725; AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 162; Journal Issue: 9; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; turbulent combustion; direct numerical simulation; flame speed; thin reaction zones; lean premixed; natural gas; 36 MATERIALS SCIENCE

Citation Formats

Sankaran, Ramanan, Hawkes, Evatt R., Yoo, Chun Sang, and Chen, Jacqueline H. Response of flame thickness and propagation speed under intense turbulence in spatially developing lean premixed methane–air jet flames. United States: N. p., 2015. Web. doi:10.1016/j.combustflame.2015.05.019.
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Sankaran, Ramanan, Hawkes, Evatt R., Yoo, Chun Sang, & Chen, Jacqueline H. Response of flame thickness and propagation speed under intense turbulence in spatially developing lean premixed methane–air jet flames. United States. https://doi.org/10.1016/j.combustflame.2015.05.019
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Sankaran, Ramanan, Hawkes, Evatt R., Yoo, Chun Sang, and Chen, Jacqueline H. Mon . "Response of flame thickness and propagation speed under intense turbulence in spatially developing lean premixed methane–air jet flames". United States. https://doi.org/10.1016/j.combustflame.2015.05.019. https://www.osti.gov/servlets/purl/1212349.
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@article{osti_1212349,
title = {Response of flame thickness and propagation speed under intense turbulence in spatially developing lean premixed methane–air jet flames},
author = {Sankaran, Ramanan and Hawkes, Evatt R. and Yoo, Chun Sang and Chen, Jacqueline H.},
abstractNote = {In this study, direct numerical simulations of three-dimensional spatially-developing turbulent Bunsen flames were performed at three different turbulence intensities. The simulations were performed using a reduced methane–air chemical mechanism which was specifically tailored for the lean premixed conditions simulated here. A planar-jet turbulent Bunsen flame configuration was used in which turbulent preheated methane–air mixture at 0.7 equivalence ratio issued through a central jet and was surrounded by a hot laminar coflow of burned products. The turbulence characteristics at the jet inflow were selected such that combustion occured in the thin reaction zones (TRZ) regime. At the lowest turbulence intensity, the conditions fall on the boundary between the TRZ regime and the corrugated flamelet regime, and progressively moved further into the TRZ regime by increasing the turbulent intensity. The data from the three simulations was analyzed to understand the effect of turbulent stirring on the flame structure and thickness. Statistical analysis of the data showed that the thermal preheat layer of the flame was thickened due to the action of turbulence, but the reaction zone was not significantly affected. A global and local analysis of the burning velocity of the flame was performed to compare the different flames. Detailed statistical averages of the flame speed were also obtained to study the spatial dependence of displacement speed and its correlation to strain rate and curvature.},
doi = {10.1016/j.combustflame.2015.05.019},
journal = {Combustion and Flame},
number = 9,
volume = 162,
place = {United States},
year = {Mon Jun 22 00:00:00 EDT 2015},
month = {Mon Jun 22 00:00:00 EDT 2015}
}
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https://doi.org/10.1016/j.combustflame.2015.05.019
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    Thin reaction zones in constant-density turbulent flows at low Damköhler numbers: Theory and simulations
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    • Physics of Fluids, Vol. 31, Issue 5
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    Direct Numerical Simulations of NO x formation in spatially developing turbulent premixed Bunsen flames with mixture inhomogeneity
    conference, January 2017

    • Luca, Stefano; Attili, Antonio; Bisetti, Fabrizio
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    Flame Annihilation Displacement Speed and Stretch Rate in Turbulent Premixed Flames
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    • Haghiri, Ali; Talei, Mohsen; Brear, Michael J.
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