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Title: Definition, dimensionality, and resolution effects on the flame surface area at high Karlovitz number [Turbulent flame surface area at high Karlovitz number]

Abstract

Direct numerical simulations of turbulent premixed flames are used to assess differences in flame surface area between recent experimental and numerical studies at high Karlovitz number. Simulations performed at varying Karlovitz number and integral length scale reveal a strong correlation between the turbulent flame speed and the flame surface area. Experimental measurements from the literature do not always exhibit such strong correlation. Potential discrepanices between the experimental and numerical methodologies are identified and quantified. The experimental PLIF images are two-dimensional and their resolution is limited by that of the PLIF system. The implication of using two-dimensional isocontours is assessed by post-processing the simulation data. It is shown that the surface computed from the three-dimensional field is always greater than that computed from the two-dimensional images. Furthermore, the effect of the PLIF resolution is assessed by filtering the simulated data. Significant differences between the unfiltered and filtered surface areas are observed at a filter width representative of the PLIF resolution.

Authors:
 [1];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1458712
Report Number(s):
LLNL-JRNL-742106
Journal ID: 896755; 896755
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Name: Proceedings of the Combustion Institute
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; turbulent premixed flames; high Karlovitz number; flame speed; flame surface area

Citation Formats

Lapointe, S., Cheng, L., and Blanquart, G. Definition, dimensionality, and resolution effects on the flame surface area at high Karlovitz number [Turbulent flame surface area at high Karlovitz number]. United States: N. p., 2017. Web.
Lapointe, S., Cheng, L., & Blanquart, G. Definition, dimensionality, and resolution effects on the flame surface area at high Karlovitz number [Turbulent flame surface area at high Karlovitz number]. United States.
Lapointe, S., Cheng, L., and Blanquart, G. Fri . "Definition, dimensionality, and resolution effects on the flame surface area at high Karlovitz number [Turbulent flame surface area at high Karlovitz number]". United States. https://www.osti.gov/servlets/purl/1458712.
@article{osti_1458712,
title = {Definition, dimensionality, and resolution effects on the flame surface area at high Karlovitz number [Turbulent flame surface area at high Karlovitz number]},
author = {Lapointe, S. and Cheng, L. and Blanquart, G.},
abstractNote = {Direct numerical simulations of turbulent premixed flames are used to assess differences in flame surface area between recent experimental and numerical studies at high Karlovitz number. Simulations performed at varying Karlovitz number and integral length scale reveal a strong correlation between the turbulent flame speed and the flame surface area. Experimental measurements from the literature do not always exhibit such strong correlation. Potential discrepanices between the experimental and numerical methodologies are identified and quantified. The experimental PLIF images are two-dimensional and their resolution is limited by that of the PLIF system. The implication of using two-dimensional isocontours is assessed by post-processing the simulation data. It is shown that the surface computed from the three-dimensional field is always greater than that computed from the two-dimensional images. Furthermore, the effect of the PLIF resolution is assessed by filtering the simulated data. Significant differences between the unfiltered and filtered surface areas are observed at a filter width representative of the PLIF resolution.},
doi = {},
journal = {Proceedings of the Combustion Institute},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {11}
}