umu.sePublications
Change search
ReferencesLink to record
Permanent link

Direct link
Impacts of the Lewis and Markstein numbers effects on the flame acceleration in channels
West Virginia University, Morgantown, WV, United States.
West Virginia University, Morgantown, WV, United States.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Show others and affiliations
2016 (English)In: 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Eastern States Section of the Combustion Institute , 2016Conference paper (Refereed)
Abstract [en]

The effects of flame stretch and thermal/molecular diffusion on the flame acceleration in channels are quantified by means of the analytical and computational endeavours. The internal transport flame properties are accounted in the theory by means of the Markstein number, Mk. Being a positive or negative function of the thermal-chemical combustion parameters, such as the thermal expansion ratio and the Lewis and Zeldovich numbers, the Markstein number either moderates or promotes the flame acceleration. While Mk may provide a substantial impact on the flame acceleration rate in narrow channels, this effects diminishes with the increase of the channel width. The analysis is accompanied by extensive computational simulations of the Navier-Stokes combustion equations, which clarify the impact of the Lewis number on the flame acceleration. It is obtained that, for Le below a certain critical value, at the initial stage of flame acceleration, a globally-convex flame front is splits into two or more "fingers", accompanied by a drastic increase in the flame surface area and associated enhancement of the flame acceleration. Overall, the thermal-diffusive effects substantially facilitate the flame acceleration scenario, thereby advancing a potential deflagration-to-detonation transition. 

Place, publisher, year, edition, pages
Eastern States Section of the Combustion Institute , 2016.
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-122451OAI: oai:DiVA.org:umu-122451DiVA: diva2:938989
Conference
2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016; Princeton University, Princeton, United States, 13 March 2016 through 16 March 2016
Available from: 2016-06-17 Created: 2016-06-17 Last updated: 2016-06-17

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Valiev, Damir
By organisation
Department of PhysicsDepartment of Applied Physics and Electronics
Other Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 29 hits
ReferencesLink to record
Permanent link

Direct link