Detonation wave initiated by explosive condensation of supersaturated carbon vapor
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- 作者：A. Emelianov and A. Eremin
- 关键词：Shock wave ; Carbon vapor ; Condensation ; Heat release ; Detonation
- 刊名：Shock Waves
- 出版时间：December 2010
- 出版年：2010
- 期刊代码：100_0938-1287
- 类别：bus
- 卷：20
- 期：6
- 页码：491-498
- 数据来源：sp
摘要
An experimental study of the influence of condensation of supersaturated carbon vapor formed behind reflected shock waves on the process of propagation of a shock wave and formation of a detonation wave of condensation is carried out. Highly supersaturated carbon vapor was formed from thermal decay of unstable carbon suboxide C3O2 → C + 2CO behind a shock wave in mixtures containing 10–30%C3O2 in Ar. This reaction was followed by fast growth of condensed carbon particles, accompanied by heat release. Experiments have shown a considerable temperature and pressure increase in the narrow zone behind the wave front, resulting in shock wave amplification and transition to a detonation-like regime. An analysis of the kinetics and heat release in the given conditions and calculations based upon one-dimensional detonation theory have shown that in a mixture of 10%C3O2 + Ar, insufficient heat release resulted in a regime of “overdriven detonation”. In a mixture of 20%C3O2 + Ar a very good coincidence of measured values of pressure and wave velocity with calculated Chapman–Jouguet parameters is observed. In a 30%C3O2 + Ar mixture, an excess heat release caused a slow down of the effective condensation rate and a regime of “underdriven detonation” is observed.