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Hydrogen-oxygen flame acceleration and deflagration-to-detonation transition in three-dimensional rectangular channels with no-slip walls
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2013 (English)In: International journal of hydrogen energy, ISSN 0360-3199, Vol. 38, no 36, 16427-16440 p.Article in journal (Refereed) Published
Abstract [en]

Hydrogen-oxygen flame acceleration and the transition from deflagration to detonation (DDT) in channels with no-slip walls are studied using high resolution simulations of 3D reactive Navier-Stokes equations, including the effects of viscosity, thermal conduction, molecular diffusion, real equation of state and detailed (reduced) chemical reaction mechanism. The acceleration of the flame propagating from the closed end of a channel, which is a key factor for understanding of the mechanism of DDT, is thoroughly studied. The three dimensional modeling of the flame acceleration and DDT in a semi-closed rectangular channel with cross section 10 x 10 mm and length 250 mm confirms validity of the mechanism of deflagration-to-detonation transition, which was proposed earlier theoretically and verified using 2D simulations. We show that 3D model contrary to 2D models allows to understand clearly the meaning of schlieren photos obtained in experimental studies. The "numerical schlieren" and "numerical shadowgraph" obtained using 3D calculations clarify the meaning of the experimental schlieren and shadow photos and some earlier misinterpretations of experimental data.

Place, publisher, year, edition, pages
2013. Vol. 38, no 36, 16427-16440 p.
Keyword [en]
Hydrogen/oxygen, flame acceleration, DDT, Shock wave, 3D modeling, Detailed chemistry, Detonation
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-139270DOI: 10.1016/j.ijhydene.2013.08.124ISI: 000327904500062ScopusID: 2-s2.0-84888009057OAI: diva2:685245

QC 20140109

Available from: 2014-01-09 Created: 2014-01-08 Last updated: 2014-01-09Bibliographically approved

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Liberman, Mikhail A.
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Nordic Institute for Theoretical Physics NORDITA
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