LAMINAR BURNING VELOCITIES AND TRANSITION TO UNSTABLE FLAMES IN H2/O2/N2 AND C3H8/O2/N2 MIXTURES

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Effects of positive flame stretch on laminar burning velocities, and conditions for transition to unstable flames, were studied experimentally for freely propagating spherical flames at both stable and unstable preferential-diffusion conditions. The data base involved new measurements for H-2/O2/N2 mixtures at values of flame stretch up to 7600 s-1, and existing measurements for C3H8/O2/N2 mixtures at values of flame stretch up to 900 s-1. Laminar burning velocities varied linearly with increasing Karlovitz numbers-either decreasing or increasing at stable or unstable preferential-diffusion conditions-yielding Markstein numbers that primarily varied with the fuel-equivalence ratio. Neutral preferential-diffusion conditions, however, were shifted toward the unstable side of the maximum laminar burning velocity condition that the simplest preferential-diffusion theories associate with neutral stability. All flames exhibited transition to unstable flames: unstable preferential-diffusion conditions yielded early transition to irregular flame surfaces, and stable preferential-diffusion conditions yielded delayed transition to cellular flames by hydrodynamic instability. Conditions for hydrodynamic instability transitions for H2/O2/N2 mixtures were consistent with an earlier correlation due to Groff for propane/air flames, based on the predictions of Istratov and Librovich.
Publisher
ELSEVIER SCIENCE INC
Issue Date
1992-09
Language
English
Article Type
Article
Keywords

HYDROGEN AIR FLAMES; PREMIXED FLAMES; DIFFUSION; NUMBERS

Citation

COMBUSTION AND FLAME, v.90, no.3-4, pp.230 - 246

ISSN
0010-2180
DOI
10.1016/0010-2180(92)90085-4
URI
http://hdl.handle.net/10203/66322
Appears in Collection
AE-Journal Papers(저널논문)
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