Examination of the effect of differential molecular diffusion in DNS of turbulent non-premixed flames

Han, Chao; Lignell, David O.; Hawkes, Evatt R.; Chen, Jacqueline H.; Wang, Haifeng

doi:10.1016/j.ijhydene.2017.01.094

Examination of the effect of differential molecular diffusion in DNS of turbulent non-premixed flames

Journal Article · Thu Feb 09 00:00:00 EST 2017 · International Journal of Hydrogen Energy

DOI:https://doi.org/10.1016/j.ijhydene.2017.01.094· OSTI ID:1345537

Han, Chao ^[1]; ^[2]; Hawkes, Evatt R. ^[3]; Chen, Jacqueline H. ^[4]; Wang, Haifeng ^[1]

Purdue Univ., West Lafayette, IN (United States)
Brigham Young Univ., Provo, UT (United States)
Univ. of New South Wales, Sydney, NSW (Australia)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Here, the effect of differential molecular diffusion (DMD) in turbulent non-premixed flames is studied by examining two previously reported DNS of temporally evolving planar jet flames, one with CO/H₂ as the fuel and the other with C₂H₄ as the fuel. The effect of DMD in the CO/H₂ DNS flames in which H₂ is part of fuel is found to behave similar to laminar flamelet, while in the C₂H₄ DNS flames in which H₂ is not present in the fuel it is similar to laminar flamelet in early stages but becomes different from laminar flamelet later. The scaling of the effect of DMD with respect to the Reynolds number Re is investigated in the CO/H₂ DNS flames, and an evident power law scaling (~Re^–a with a a positive constant) is observed. The scaling of the effect of DMD with respect to the Damkohler number Da is explored in both laminar counter-flow jet C₂H₄ diffusion flames and the C₂H₄ DNS flames. A power law scaling (~Da^a with a a positive constant) is clearly demonstrated for C₂H₄ nonpremixed flames.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1345537

Alternate ID(s):: OSTI ID: 1396496

Report Number(s):: SAND--2017-0647J; PII: S0360319917302616

Journal Information:: International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 16 Vol. 42; ISSN 0360-3199

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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