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Title: Turbulence-flame interactions in DNS of a laboratory high Karlovitz premixed turbulent jet flame

Authors:
 [1];  [2];  [3]
  1. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
  2. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia, School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
  3. Sandia National Laboratories, Livermore, California 94550, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1325838
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physics of Fluids
Additional Journal Information:
Journal Volume: 28; Journal Issue: 9; Related Information: CHORUS Timestamp: 2018-03-09 12:36:17; Journal ID: ISSN 1070-6631
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Haiou, Hawkes, Evatt R., and Chen, Jacqueline H.. Turbulence-flame interactions in DNS of a laboratory high Karlovitz premixed turbulent jet flame. United States: N. p., 2016. Web. doi:10.1063/1.4962501.
Wang, Haiou, Hawkes, Evatt R., & Chen, Jacqueline H.. Turbulence-flame interactions in DNS of a laboratory high Karlovitz premixed turbulent jet flame. United States. doi:10.1063/1.4962501.
Wang, Haiou, Hawkes, Evatt R., and Chen, Jacqueline H.. Wed . "Turbulence-flame interactions in DNS of a laboratory high Karlovitz premixed turbulent jet flame". United States. doi:10.1063/1.4962501.
@article{osti_1325838,
title = {Turbulence-flame interactions in DNS of a laboratory high Karlovitz premixed turbulent jet flame},
author = {Wang, Haiou and Hawkes, Evatt R. and Chen, Jacqueline H.},
abstractNote = {},
doi = {10.1063/1.4962501},
journal = {Physics of Fluids},
number = 9,
volume = 28,
place = {United States},
year = {Wed Sep 21 00:00:00 EDT 2016},
month = {Wed Sep 21 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4962501

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • This article reports an analysis of the first detailed chemistry direct numerical simulation (DNS) of a high Karlovitz number laboratory premixed flame. The DNS results are first compared with those from laser-based diagnostics with good agreement. The subsequent analysis focuses on a detailed investigation of the flame area, its local thickness and their rates of change in isosurface following reference frames, quantities that are intimately connected. The net flame stretch is demonstrated to be a small residual of large competing terms: the positive tangential strain term and the negative curvature stretch term. The latter is found to be driven bymore » flame speed–curvature correlations and dominated in net by low probability highly curved regions. Flame thickening is demonstrated to be substantial on average, while local regions of flame thinning are also observed. The rate of change of the flame thickness (as measured by the scalar gradient magnitude) is demonstrated, analogously to flame stretch, to be a competition between straining tending to increase gradients and flame speed variations in the normal direction tending to decrease them. The flame stretch and flame thickness analyses are connected by the observation that high positive tangential strain rate regions generally correspond with low curvature regions; these regions tend to be positively stretched in net and are relatively thinner compared with other regions. Finally, high curvature magnitude regions (both positive and negative) generally correspond with lower tangential strain; these regions are in net negatively stretched and thickened substantially.« less
  • Cited by 21
  • This supplementary material complements the article and provides additional information to the chemical mechanism used in this work, boundary conditions for the LES con guration and table generation, comparisons of axial velocities, results from a LES/ nite-rate chemistry (FRC) approach, and results from the LES/DTF/SPF approach with a particular chemistry table that is generated using a single strained premixed amelet solution.
  • Two complementary simulations of premixed turbulent flames are discussed. Low Reynolds number two-dimensional direct numerical simulation of a premixed turbulent V flame is first performed, to further analyze the behavior of various flame quantities and to study key ingredients of premixed turbulent combustion modeling. Flame surface density, subgrid-scale variance of progress variables, and unresolved turbulent fluxes are analyzed. These simulations include fully detailed chemistry from a flame-generated tabulation (FPI) and the analysis focuses on the dynamics of the thin flame front. Then, a novel subgrid scale closure for large eddy simulation of premixed turbulent combustion (FSD-PDF) is proposed. It combinesmore » the flame surface density (FSD) approach with a presumed probability density function (PDF) of the progress variable that is used in FPI chemistry tabulation. The FSD is useful for introducing in the presumed PDF the influence of the spatially filtered thin reaction zone evolving within the subgrid. This is achieved via the exact relation between the PDF and the FSD. This relation involves the conditional filtered average of the magnitude of the gradient of the progress variable. In the modeling, this conditional filtered mean is approximated from the filtered gradient of the progress variable of the FPI laminar flame. Balance equations providing mean and variance of the progress variable together with the measure of the filtered gradient are used to presume the PDF. A three-dimensional larger Reynolds number flow configuration (ORACLES experiment) is then computed with FSD-PDF and the results are compared with measurements.« less