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Evolution of detonation formation initiated by a spatially distributed, transient energy source

Published online by Cambridge University Press:  04 August 2016

Jonathan D. Regele ,
David R. Kassoy ,
Mohamad Aslani  and
Oleg V. Vasilyev
Jonathan D. Regele*
Affiliation:
Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA
David R. Kassoy
Affiliation:
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA
Mohamad Aslani
Affiliation:
Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA
Oleg V. Vasilyev
Affiliation:
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA
*
†Email address for correspondence: jregele@iastate.edu
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Abstract

Detonations usually form through either direct initiation or deflagration-to-detonation transition (DDT). In this work, a detonation initiation process is introduced that shows attributes from each of these two processes. Energy is deposited into a finite volume of fluid in an amount of time that is similar to the acoustic time scale of the heated fluid volume. Two-dimensional simulations of the reactive Euler equations are used to solve for the evolving detonation initiation process. The results show behaviour similar to both direct initiation and DDT. Localized reaction transients are shown to be intimately related to the appearance of a detonation. Thermomechanical concepts are used to provide physical interpretations of the computational results in terms of the interaction between compressibility phenomena on the acoustic time scale and localized, spatially resolved, chemical energy addition on a heat-addition time scale.

JFM classification

Reacting Flows: Combustion Compressible Flows: Compressible Flows Compressible Flows: Detonation waves

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 802 , 10 September 2016 , pp. 305 - 332
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© 2016 Cambridge University Press 

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