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

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 (~Daa with a a positive constant) is clearly demonstrated for C2H4 nonpremixed flames.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [4] ;  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Brigham Young Univ., Provo, UT (United States)
  3. Univ. of New South Wales, Sydney, NSW (Australia)
  4. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Report Number(s):
SAND-2017-0647J
Journal ID: ISSN 0360-3199; PII: S0360319917302616
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
International Journal of Hydrogen Energy
Additional Journal Information:
Journal Volume: 42; Journal Issue: 16; Journal ID: ISSN 0360-3199
Publisher:
Elsevier
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; differential molecular diffusion; turbulent non-premixed flames; Reynolds number; Damkohler number; Laminar flamelet
OSTI Identifier:
1345537