Research status and development trend of combustible gas explosion venting characteristics
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摘要: 为安全运输和储存极易燃爆的可燃气体，必须采取防控手段。泄爆作为一种防控其爆炸危害性的有效途径，为提高泄爆手段的效率性和安全性，推动泄爆外流场二次爆炸的进一步研究，分析了国内外可燃气体爆炸与泄爆的研究现状，总结了近20年来可燃气体泄爆的理论和取得的成果。多年研究表明，可燃气体爆炸特性已形成系统性的研究，为可燃气体泄爆特性研究提供了数据支持。对泄爆引起的内、外流场爆炸参数和火焰发展变化进行了详细研究，发现内、外流场压力波与火焰波之间的耦合作用下加剧了泄爆的危害性，基于研究结果对泄爆的效果进行了评价。因泄爆外流场二次爆炸受冲击波-火焰耦合演化机制认知不清的限制，难以对二次爆炸产生进行定义。二次爆炸对泄爆参数变化的影响研究有了初步研究。泄爆研究仍需在实验方面缩小影响因素跨度，改善泄爆设备，在模拟方面开展对复杂模型的研究，对泄爆危害的预估和泄爆效果的评价仍需大量理论和数据。以此来实现可燃气体的安全运输和存储，拓宽可燃气体的应用方向。
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Abstract: In order to ensure the safe transportation and storage of highly flammable and combustible gases, it is essential to implement effective prevention and control measures.Explosion venting as an effective way to prevent and control its explosion hazards,In order to improve the efficiency and safety of explosion venting means,to promote the further study of secondary explosion in the external flow field of explosion venting,the research status of combustible gas explosion and explosion venting at home and abroad is analyzed, and the theory and achievements of combustible gas explosion venting in recent 20 years are summarized.Years of research has shown that the explosion characteristics of combustible gases has formed a systematic study, providing data support for the study of combustible gas venting characteristics.A comprehensive examination of the explosion parameters and flame development alterations in the internal and external flow fields resulting from deflagration.The hazard of deflagration was found to be exacerbated by the coupling between pressure waves and flame waves in the internal and external flow fields.The effectiveness of deflagration was evaluated based on the results of the study.It is difficult to define the secondary explosion generation because the secondary explosion in the vent outflow field is limited by the poorly recognized evolutionary mechanism of blast-flame coupling.A preliminary study of the effect of the secondary explosion on the variation of the deflagration parameters has been carried out.Explosion venting research still needs to narrow the span of influencing factors in the experimental aspect, improve the explosion venting equipment, in the simulation aspect to carry out the study of complex models, the prediction of explosion venting hazards and the evaluation of the effect of explosion venting still need a lot of theory and data.In this way, the safe transportation and storage of flammable gases can be realized and the applications of flammable gases can be broadened.. -
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