Abstract 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.

中文翻译：

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无限制空间中的爆燃到爆轰的转变

摘要 受限系统中爆燃到爆轰的转变是一个常识问题，但在无受限空间中转变的可行性仍然存在争议。以自由膨胀的自加速球形火焰为例，表明只要火焰足够大，在无约束气态系统中从爆燃到爆轰的转变确实是可能的。这种转变是由加速火焰和火焰驱动的压力积聚之间的正反馈引起的，当火焰速度达到临界水平时会导致热失控。