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Title: Direct numerical simulation of soot formation in a three-dimensional nonpremixed ethylene jet flame.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1148127
Report Number(s):
SAND2007-3529C
522727
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the Computational Combustion 2007 held July 18-20, 2007 in Delft, Netherlands.
Country of Publication:
United States
Language:
English

Citation Formats

Lignell, David, and Chen, Jacqueline H. Direct numerical simulation of soot formation in a three-dimensional nonpremixed ethylene jet flame.. United States: N. p., 2007. Web.
Lignell, David, & Chen, Jacqueline H. Direct numerical simulation of soot formation in a three-dimensional nonpremixed ethylene jet flame.. United States.
Lignell, David, and Chen, Jacqueline H. Fri . "Direct numerical simulation of soot formation in a three-dimensional nonpremixed ethylene jet flame.". United States. doi:. https://www.osti.gov/servlets/purl/1148127.
@article{osti_1148127,
title = {Direct numerical simulation of soot formation in a three-dimensional nonpremixed ethylene jet flame.},
author = {Lignell, David and Chen, Jacqueline H.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}

Conference:
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  • Abstract not provided.
  • Three-dimensional direct numerical simulation of soot formation with complex chemistry is presented. The simulation consists of a temporally evolving, planar, nonpremixed ethylene jet flame with a validated, 19-species reduced mechanism. A four-step, three-moment, semiempirical soot model is employed. Previous two-dimensional decaying turbulence simulations have shown the importance of multidimensional flame dynamical effects on soot concentration [D.O. Lignell, J.H. Chen, P.J. Smith, T. Lu, C.K. Law, Combust. Flame 151 (1-2) (2007) 2-28]. It was shown that flame curvature strongly impacts the diffusive motion of the flame relative to soot (which is essentially convected with the flow), resulting in soot being differentiallymore » transported toward or away from the flame zone. The proximity of the soot to the flame directly influences soot reactivity and radiative properties. Here, the analysis is extended to three dimensions in a temporal jet configuration with mean shear. Results show that similar local flame dynamic effects of strain and curvature are important, but that enhanced turbulent mixing of fuel and oxidizer streams has a first-order effect on transport of soot toward flame zones. Soot modeling in turbulent flames is a challenge due to the complexity of soot formation and transport processes and the lack of detailed experimental soot-flame-flow structural data. The present direct numerical simulation provides the first step toward providing such data. (author)« less
  • Abstract not provided.
  • A numerical study of soot formation in the near-field of a strongly radiating, nonpremixed, acetylene-air planar jet flame is conducted using Large Eddy Simulation in two dimensions to examine coupled turbulence, soot chemistry, and radiation effects. The two-dimensional, Favre-filtered, compressible Navier-Stokes, total sensible energy and mixture fraction equations are closed using the Smagorinsky subgrid-scale (SGS) turbulence model. Major species of gas-phase combustion are obtained using a laminar flamelet model by employing experimentally obtained laminar flame state relationships for the major species mass fractions as a function of gas-phase mixture fraction. A combination of a presumed Beta filtered density function andmore » a scale-similarity model are used to account for SGS mixture fraction and scalar dissipation fluctuations on the filtered composition and heat release rate. A soot transport and finite-rate kinetics model accounting for soot nucleation, surface growth, agglomeration, and oxidation is used. Radiation is modeled by integrating the filtered radiative transfer equation using the discrete ordinates method. Both instantaneous and time-averaged results are presented in order to highlight physical and numerical modeling issues and to examine turbulence, soot chemistry, and radiation interactions. Qualitative comparisons are made to precious numerical results and experimental data.« less