Flame dynamics in sub-millimetre combustors
by Shaurya Prakash, Adrian D. Armijo, Richard I. Masel, Mark A. Shannon
International Journal of Alternative Propulsion (IJAP), Vol. 1, No. 2/3, 2007

Abstract: This paper describes experimental observations of flame dynamics within an alumina non-premixed combustor with a sub-millimetre (0.75 mm) minimum size. These flame dynamics occur within a total combustor volume of 130 mm³ and are imaged through a sapphire window. The confined flames are surveyed using visual still-frames, high-speed flame imaging, measurement of external wall temperatures, and recordings of acoustic emissions from the combustor. The observed flame dynamics are characterised by an oscillating edge-flame that is anchored at the combustor inlet and is accompanied by ignition/extinction events leading to the eventual formation of a stable edge-flame and distinct cellular structures along the reaction channel. This paper investigates the unstable and unsteady flame dynamics within the non-premixed sub-millimetre combustors from ignition to the formation of stable flame structures.

Online publication date: Tue, 03-Apr-2007

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