Deflagration-to-detonation transition in an unconfined space: Expanding hydrogen-oxygen flames

Andrey Koksharov, Leonid Kagan*, Gregory Sivashinsky

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


The problem of deflagration-to-detonation transition in an unconfined environment was studied wth a freely expanding self-accelerating fractal-like H2-O2 flame as an example. Deflagration-to-detonation transition was indeed possible provided the flame is large enough. The transition occurred prior to merging of the flame with the flame-supported precursor shock. The pre-transition flame did not reach the threshold of CJ-deflagration. Numerical simulations employed are based on the recently developed pseudospectral method with time and space adaptation.

Original languageEnglish
Pages (from-to)3505-3511
Number of pages7
JournalProceedings of the Combustion Institute
Issue number3
StatePublished - 2021
Event38th International Symposium on Combustion, 2021 - Adelaide, Australia
Duration: 24 Jan 202129 Jan 2021


  • Accelerating flames
  • Computational reactive fluid dynamics
  • Deflagration-to-detonation transition
  • Thermal runaway of fast flames


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