Deflagration-to-detonation transition in an unconfined space

Andrey Koksharov, Viatcheslav Bykov, Leonid Kagan, Gregory Sivashinsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Whereas deflagration-to-detonation transition in confined systems is a matter of common knowledge, feasibility of the transition in unconfined space is still a matter of controversy. With a freely expanding self-accelerating spherical flame as an example, it is shown that deflagration-to-detonation transition in unconfined gaseous systems is indeed possible provided the flame is large enough. The transition is caused by positive feedback between the accelerating flame and the flame-driven pressure buildup, which results in the thermal runaway when the flame speed reaches a critical level.

Original languageEnglish
Pages (from-to)163-169
Number of pages7
JournalCombustion and Flame
StatePublished - Sep 2018


FundersFunder number
US–Israel Binational Science Foundation2012–057
United States-Israel Binational Science Foundation
Israel Science Foundation335/13


    • Accelerating flames
    • Deflagration-to-detonation transition
    • Thermal runaway of fast flames


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