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Flame Acceleration and Transition to Detonation in High Speed Turbulent Combustion

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Technical Report,01 Apr 2014,01 Dec 2016

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University of Maryland Office of Sponsored Programs College park United States

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The objective of this project is to address the grand-challenge question in combustion dynamics How and under what circumstances does a flame propagating in a smooth channel accelerate to the point where there is a transition to detonation DDT We are also asking What are the specific physical mechanisms controlling this process Work has progressed on five fronts 1 Clarifying the route to DDT as the channel geometries change from large to small flow blockages 2 Finding the mechanism of DDT in small, smooth channels 3 Finding adequate and simplified models for chemical and diffusion processes for use in complex reactive-fluid-dynamics simulations of hydrocarbon combustion 4 Determining the effects of surface roughness on DDT and 5 Determining the effects of acoustic-flame-boundary interactions in closed channels containing fuel-air mixtures.

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