初始预混区外瞬态反应流及火焰传播规律

Investigation for the accident consequences of methane explosion in underground coal mines and primary results of model experiments showed that the gas explosion within the original premixed area of methane/air is noly a part of hazdous effect of a acident. Another part of the hazardous effects is beyond the original premixed area of methane/air. The hazardous effects beyond the original premixed area of methane/air have the wider action area. Why does the explosion occur in a range which is seveal times longer than that of original premixed area beyond the orignal premixed area? How do flow and explosion of gas beyond the original premixed area of methane/air attenuate? Many data on combustion and explosion within the original premixed area have been reported in the previous literatures. However, the combustion and explosion beyond the original premixed area has not been paid more attention untill now. It is a base to judge whether a gas explosion could induce the fire or the second accident. It is also a new issue which needs to be investigated in the field of gas explosion. The main aim and contents of this project are to: (a)study the rules on explosion and combustion beyond the origial premixed area of methane/air; (b) study the pressure and temperature distribution produced by the transient reacting flow; (c)determine the relationship between the transient flow velocity and the dimension of orignal premixed area, the concentration of methane in air,and the confinded condition; (d)obtain the law for chemical reacting rate with distance beyond the original premixed area. The mechanism of explosion to combustion transition beyond the original premixed area will be discussed in this project. The project will provide a scentific base for design of explosion-proof and disaster prevention for methane explosion in underground coal mines.

爆炸灾害是当今国内外重大事故的主要类型，瓦斯爆炸往往造成次生灾害，也是群死群伤的主要原因。瓦斯爆炸事故后果调查和初步的模拟实验结果表明，初始预混区内气体爆炸只是事故灾害的一部分，而影响更为宽泛的爆炸与燃烧处于初始预混区之外。初始预混区内的燃烧爆炸和燃烧转爆轰已有丰富的研究成果，初始预混区外瞬态反应流动和爆炸规律尚未得到充分关注，它是爆炸事故诱导火灾、发生连锁灾害效应判研的前提。初始预混区的瞬态扩展和爆炸转燃烧是爆炸力学领域的新命题，也是安全科学与爆炸力学交叉学科面临的新课题。本课题研究初始预混区瞬态扩展的物理过程；研究得到初始预混区外爆炸转为燃烧的条件和规律；研究得到初始预混区外瞬态化学反应流动的压力场和温度场分布；研究得到初始预混区外混合气体化学反应率的变化规律；揭示初始预混区外气体爆炸转燃烧的物理机制；探索燃爆过程与瞬态流动的耦合关系，为瓦斯爆炸事故连锁灾害效应的预防控制提供科学依据。

初始预混区内的燃烧爆炸和燃烧转爆轰已有丰富的研究成果，初始预混区外瞬态反应流动和爆炸规律尚未得到充分关注，它是爆炸事故诱导火灾、发生连锁灾害效应判研的前提。初始预混区的瞬态扩展和爆炸转燃烧是爆炸力学领域的新命题，也是安全科学与爆炸力学交叉学科面临的新课题。本课题研究了初始预混区瞬态扩展的物理过程；得到了初始预混区外爆炸转为燃烧的条件和规律；得到了初始预混区外瞬态化学反应流动的压力场和温度场分布；得到了初始预混区外混合气体化学反应率的变化规律；揭示了初始预混区外气体爆炸转燃烧的物理机制；探索得到了燃爆过程与瞬态流动的耦合关系。本项目建立了爆炸转燃烧新理论体系，同时为瓦斯爆炸事故连锁灾害效应的预防控制提供了科学依据。.在国际爆炸安全主流刊物发表论文33篇（全部SCI收录），其中国际顶级刊物发表论文12篇，参加爆炸安全国际著名学术系列会议1人次，国内学术会议6人次，培养博士研究生4名。按计划完成任务。