Experimental studies on pressure dynamics of C2H4/N2O mixtures explosion with dilution
Experimental studies on pressure dynamics of C2H4/N2O mixtures explosion with dilution
复制标题
C2H4/N2O混合物稀释爆炸压力动力学实验研究
DOI：
10.1016/j.applthermaleng.2018.10.053
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发表时间：
2019-01
影响因子：
6.4
通讯作者：
Cheng Xianghua
中科院分区：
文献类型：
--
作者：
Shen Xiaobo;Zhang Ningning;Shi Xuemei;Cheng Xianghua
由于N2O广泛存在于核废料和航空航天应用中，因此引起了人们对其安全性的关注。本研究对C2H4/N2O与n2或co2稀释的化学计量混合物进行了测试，以了解爆炸机理和危害。实验在标准的20 l球形爆炸容器中进行，初始压力为0.2 bar、0.35 bar和0.5 bar。结果表明：在质量分数中n2或CO2稀释小于30%时，存在火焰加速机制或向爆轰过渡，最大爆炸压力接近Chapman-Jouguet （CJ）爆轰压力；此外，在初始压力为0.2 bar时，爆炸过程呈现出三个不同的阶段，而在0.35 bar或0.5 bar时，第三阶段很难区分，这表明由于容器内燃烧时间较短，过渡到爆轰的完成程度较低。此外，N2和co2的稀释都可以通过增强三分子反应O + N2+ M → N2O + M （R4）来约束N2O分解，从而抑制爆炸。但与CO2相比，n2对R4更有效，因此抑制效果更好。而当稀释度达到30%以上时，绝热条件下的爆炸与化学平衡法的预测结果吻合较好。观察并解释了尖峰（SP）和宽峰（BP）。
Safety concerns of N2O has arisen due to its extensive existence in nuclear waste and aerospace applications. In present study, the stoichiometric mixtures of C2H4/N2O with N2or CO2dilution were examined to know the explosion mechanism and hazard. The experiments were carried out in a standard 20-L spherical explosion vessel with pressure sensor at initial pressures of 0.2 bar, 0.35 bar and 0.5 bar. The results show that, with less than 30% dilution (N2or CO2, in mass fraction), there exists a flame acceleration mechanism or transition to detonation with measured maximum explosion pressure approaching Chapman-Jouguet (CJ) detonation pressure. Furthermore, at initial pressure of 0.2 bar, the explosion process presents three distinct stages, while at 0.35 bar or 0.5 bar, the third stage is hard to be distinguished, which indicates less accomplished transition to detonation due to the shorter combustion duration in the vessel. Besides, both N2and CO2dilutions can inhibit the explosion through constraint to N2O decomposition via enhanced trimolecular reaction, O + N2+ M → N2O + M (R4). But compared to CO2, N2is more effective in R4, which results in better inhibition effect. By contrast, with 30% or more dilution, the explosion agrees well with the prediction by chemical equilibrium method at adiabatic condition. Sharp peak (SP) and broad peak (BP) were observed and interpreted.
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影响因子：
7.2
作者：
S. Bane;R. Mével;S. Coronel;J. Shepherd
通讯作者：
S. Bane;R. Mével;S. Coronel;J. Shepherd
影响因子：
7.8
作者：
Y. Koshiba;T. Nishida;N. Morita;H. Ohtani
通讯作者：
Y. Koshiba;T. Nishida;N. Morita;H. Ohtani
DOI：
10.1016/0950-4230(90)80005-u
发表时间：
1990-10
影响因子：
3.5
作者：
H. Phylaktou;G. Andrews;P. Herath
通讯作者：
H. Phylaktou;G. Andrews;P. Herath
DOI：
10.1016/j.proci.2010.06.165
发表时间：
2011
期刊：
--
影响因子：
--
作者：
Bo Zhang;Vsevolods Kamenskihs;H. D. Ng;John H. S. Lee
通讯作者：
Bo Zhang;Vsevolods Kamenskihs;H. D. Ng;John H. S. Lee
影响因子：
4.4
作者：
Bradley, D;Cresswell, TM;Puttock, JS
通讯作者：
Puttock, JS