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The problem of deflagration-to-detonation transition in an unconfinedenvironment is revisited. With a freely expanding self-acceleratinghydrogen-oxygen flame as an example, it is shown thatdeflagration-to-detonation transition is indeed possible provided the flame islarge enough. The transition occurs prior to merging of the flame with theflame-supported precursor shock. The pre-transition flame does not reach thethreshold of CJ-deflagration. Numerical simulations employed are based on therecently developed pseudo-spectral method with time and space adaptation.

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