文献类型：期刊文献

英文题名：Experimental studies on pressure dynamics of C2H4/N2O mixtures explosion with dilution

作者：Shen, Xiaobo[1,2];Zhang, Ningning[3];Shi, Xuemei[4];Cheng, Xianghua[4]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Risk Assessment &, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Shanghai Space Prop Technol Res Inst, Shanghai 201109, Peoples R China;[4]Xian Aerosp Prop Test Tech Inst, Xian 700100, Shaanxi, Peoples R China

年份：2019

卷号：147

起止页码：74

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20184305982923);WOS:【SCI-EXPANDED(收录号:WOS:000454974700007)】；

基金：This work is funded by Shanghai Sailing Program (No. 16YF1402000), the National Natural Science Foundation of China (Grant No.51604121), and Tianjin Fire Research Institute of MPS (Grant No. 2017SJ-A-32). The authors gratefully thank these supports.

语种：英文

外文关键词：N2O; C2H4; Explosion pressure; Dilution; Decomposition

摘要：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 N-2 or CO2 dilution 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 (N-2 or 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 N-2 and CO2 dilutions can inhibit the explosion through constraint to N2O decomposition via enhanced trimolecular reaction, O + N-2 + M -> N2O M (R4). But compared to CO2, N-2 is 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.