CAJ | 학술논문

通过搭建长为20m、截面为0．08m ×0．08m的非绝热开口钢管，研究了甲烷与空气预混气体发生爆炸后的火焰和压力发展特征。实验结果表明：火焰信号最强的时刻对应于火焰前锋反应区内某时刻，而火焰信号起始上升时刻与火焰前锋预热区起始时刻接近，应选择某点火焰信号起始上升时刻作为该点的火焰到达时间。随着远离点火源距离的增加，火焰厚度呈现先变薄后变厚的变化趋势，最大超压呈现先减小、后增大、再减小的趋势，火焰传播速度则呈先增大后减小的变化过程。非绝热开口钢管的实验条件对爆炸超压和火焰传播速度的影响较大。研究成果可为甲烷爆炸致灾机制及防控的研究提供参考。
통과탑건장위20m、절면위0．08m ×0．08m적비절열개구강관，연구료갑완여공기예혼기체발생폭작후적화염화압력발전특정。실험결과표명：화염신호최강적시각대응우화염전봉반응구내모시각，이화염신호기시상승시각여화염전봉예열구기시시각접근，응선택모점화염신호기시상승시각작위해점적화염도체시간。수착원리점화원거리적증가，화염후도정현선변박후변후적변화추세，최대초압정현선감소、후증대、재감소적추세，화염전파속도칙정선증대후감소적변화과정。비절열개구강관적실험조건대폭작초압화화염전파속도적영향교대。연구성과가위갑완폭작치재궤제급방공적연구제공삼고。
Through establishing a non-adiabatic open pipe with a length of 20 m and a cross-sectional area of 0.08 m ×0.08 m, the flame and pressure development characteristics of premixed methane/air explosion were investi-gated experimentally.The results showed that the time of obtaining maximum flame signal value is corresponding to a certain time of flame-front reaction zone, while the time when the flame signal begins to rise is almost the same as that when the flame-front preheat zone starts.Thus, the time when the flame signal begins to rise at a certain point can be defined as the flame arrival time at this point.With increasing distance away from the ignition source, the flame thickness presents a changing trend of decreasing first and increasing after, and the maximum overpressure follows a trend of decreasing, increasing and decreasing, while the flame propagation speed shows a changing process of increasing and decreasing.The experimental conditions of non-adiabatic open steel pipe have an obvious effect on the explosion overpressure and flame propagation speed.The results can provide a reference for the further research on the disaster mechanism and control of methane explosion.