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

Sankaran, Ramanan; Hawkes, Evatt R.; Yoo, Chun Sang; Chen, Jacqueline H.

doi:10.1016/j.combustflame.2015.05.019

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

Journal Article · Mon Jun 22 00:00:00 EDT 2015 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2015.05.019· OSTI ID:1212349

Sankaran, Ramanan ^[1]; Hawkes, Evatt R. ^[2]; Yoo, Chun Sang ^[3]; Chen, Jacqueline H. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of New South Wales, Sydney (Australia)
Ulsan National Inst. of Science and Technology (Korea)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Direct numerical simulations of three-dimensional spatially-developing turbulent Bunsen flames were performed at three different turbulence intensities. We performed these simulations 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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1212349

Alternate ID(s):: OSTI ID: 1235352
OSTI ID: 1246496

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 9 Vol. 162; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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