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Effect of thermal gas expansion on the fractal structure of outwardly propagating flames
Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China.
Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The role of Darrieus-Landau instability in forming the fractal structure of the freely propagating expanding flame front is studied numerically by solving the two-dimensional Navier-Stokes equations with one step irreversible Arrhenius reaction. Numerical simulation of the radially expanding flames with Le=1 demonstrates that the temporal dependence of mean radius after a certain critical time instant is corresponding to a power law, in line with previous experimental, numerical and theoretical studies. Influence of gas expansion ratio on power-law exponent and flame surface fractal dimension is the focus of this research. It is shown that the expansion coefficient has an effect on fractal structure of the outwardly propagating flame, confirming the assumption that fractal dimension is not a universal parameter.

Place, publisher, year, edition, pages
Combustion Institute , 2019.
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Other Physics Topics
Identifiers
URN: urn:nbn:se:umu:diva-162907OAI: oai:DiVA.org:umu-162907DiVA, id: diva2:1347292
Conference
12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka; Japan; 1-5 July 2019
Available from: 2019-08-30 Created: 2019-08-30 Last updated: 2019-08-30

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