Identification of combustion mode under MILD conditions using Chemical Explosive Mode Analysis

Doan, N. A. K.; Bansude, S.; Osawa, K.; Minamoto, Y.; Lu, T.; Chen, J. H.; Swaminathan, N.

doi:10.1016/j.proci.2020.06.293

Identification of combustion mode under MILD conditions using Chemical Explosive Mode Analysis

Journal Article · Sun Sep 06 00:00:00 EDT 2020 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2020.06.293· OSTI ID:1670187

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Technische Univ. Munchen, Garching (Germany)
Univ. of Connecticut, Storrs, CT (United States)
Tokyo Institute of Technology (Japan)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of Cambridge (United Kingdom)

Direct Numerical Simulations (DNS) data of Moderate or Intense Low-oxygen Dilution (MILD) combustion are analysed in this paper to identify the contributions of the autoignition and flame modes. This is performed using an extended Chemical Explosive Mode Analysis (CEMA) which accounts for diffusion effects allowing it to discriminate between deflagration and autoignition. This analysis indicates that in premixed MILD combustion conditions, the main combustion mode is ignition for all dilution and turbulence levels and for the two reactant temperature conditions considered. In non-premixed conditions, the preponderance of the ignition mode was observed to depend on the axial location and mixture fraction stratification. With a large mixture fraction lengthscale, ignition is more preponderant in the early part of the domain while the deflagrative mode increases further downstream. On the other hand, when the mixture fraction lengthscale is small, sequential autoignition is observed. Finally, the various combustion modes are observed to correlate strongly with mixture fraction where lean mixtures are more likely to autoignite while stoichiometric and rich mixtures are more likely to react as deflagrative structures.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Sandia National Laboratories, Albuquerque, NM

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE National Nuclear Security Administration (NNSA); German Excellence Initiative; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1670187

Alternate ID(s):: OSTI ID: 1764805
OSTI ID: 1777040

Report Number(s):: SAND--2020-6490J; 686902

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 4 Vol. 38; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CEMA
Deflagration
Ignition
MILD combustion
Turbulent combustion

Identification of combustion mode under MILD conditions using Chemical Explosive Mode Analysis

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