期刊
ACTA ASTRONAUTICA
卷 176, 期 -, 页码 647-652出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actaastro.2020.02.013
关键词
Gaseous explosions; Unconfined flames; Deflagration-to-detonation transition
资金
- Program of the Presidium of Russian Academy of Sciences Mechanisms of fault tolerance assurance of the contemporary high-performance and high-reliable computations [2]
The paper is aimed at numerical study of one of the most hazardous events at a launch place: open space explosion of fuel air mixtures due to accidental loss of containments. A mechanism of transition to detonation in the process of unconfined flame propagation is proposed. It is shown that the detonation onset takes place as a result of local exponential growth of unstable short-wavelength perturbations. Exactly the same mechanism is known to be responsible for the self-similar flame acceleration, however the detonation can arise only in the case of extremely high reaction rate. High reaction rate defines a coupling of the accelerating flamelets with diverging shock waves that leads to the detonation onset.
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