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Effect of Wall Boundary Conditions on Flame Propagation in Micro-Chambers
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2016 (English)In: PROCEEDINGS OF THE ASME POWER CONFERENCE, 2015, The american society of mechanical engineers , 2016, V001T03A009Conference paper (Refereed)Text
Abstract [en]

Flame dynamics in micro-pipes have been observed to be strongly affected by the wall boundary conditions. In this respect, two mechanisms of flame acceleration are related to the momentum transferred in these regions: 1) that associated with flame stretching produced by wall friction forces; and 2) when obstacles are placed at the walls, as a result of the delayed burning occurring between them, a jet-flow is formed, intensively promoting the flame spreading. Wall thermal conditions have usually been neglected, thus restricting the cases to adiabatic wall conditions. In contrast, in the present work, the effect of the boundary conditions on the flame propagation dynamics is investigated, computationally, with the effect of wall heat losses included in the consideration. In addition, the powerful flame acceleration attained in obstructed pipes is studied in relation to the obstacle size, which determines how different this mechanism is from the wall friction. A parametric study of two-dimensional (2D) channels and cylindrical tubes, of various radiuses, with one end open is performed. The walls are subjected to slip and non-slip, adiabatic and constant temperature conditions, with different fuel mixtures described by varying the thermal expansion coefficients. Results demonstrate that higher wall temperatures promote slower propagation as they reduce the thermal expansion rate, as a result of the post-cooling of the burn matter. In turn, smaller obstacle sizes generate weaker flame acceleration, although the mechanism is noticed to be stronger than the wall friction-driven, even for the smaller sizes considered.

Place, publisher, year, edition, pages
The american society of mechanical engineers , 2016. V001T03A009
Keyword [en]
Boundary-value problems, Flames
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-120112DOI: 10.1115/POWER2015-49351ISI: 000373970600029OAI: oai:DiVA.org:umu-120112DiVA: diva2:939561
Conference
ASME 2015 Power Conference, POWER2015, San Diego, CA, JUN 28-JUL 02, 2015
Available from: 2016-06-20 Created: 2016-05-09 Last updated: 2016-06-20Bibliographically approved

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Bychkov, VitalyValiev, Damir
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Department of PhysicsDepartment of Applied Physics and Electronics
Fusion, Plasma and Space Physics

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