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无约束条件下甲烷/空气预混气体燃爆特性研究
Combustion and explosion characteristics of methane/air premixed gas under unconstrained condition
投稿时间:2022-05-13  修订日期:2022-06-26
DOI:
中文关键词:  甲烷  无约束条件  火焰传播  气体爆炸  火焰温度
英文关键词:Methane  Unconstrained condition  Flame propagation  Gas explosion  Flame temperature
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
程扬帆 安徽理工大学 230027
夏煜 安徽理工大学 230027
李世周 安徽理工大学 230027
胡芳芳 安徽理工大学 230027
朱守军 安徽理工大学 230027
沈兆武 中国科学技术大学 230027
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中文摘要:
      为研究无约束条件下甲烷/空气的燃爆特性,以乳胶气球为反应容器开展了甲烷爆炸试验,并结合Chemkin模拟和改进的比色测温技术,研究了不同当量比下甲烷/空气预混气体的火焰传播速度、爆炸超压及温度场分布等特征以及静置时间的影响。实验结果表明:甲烷爆炸火焰传播速度呈振荡分布,当量比为0.83、1.06、1.30和1.55时的平均火焰传播速度分别为1.554 m·s-1、2.122 m·s-1、1.892 m·s-1和1.428 m·s-1;峰值超压随当量比的增加呈先增大后减小的趋势,当量比为1.06时R155的敏感性系数最大,促使生成CO2的链反应形成,化学反应最彻底,峰值超压值最大;静置时间对火焰传播速度和爆炸峰值压力影响显著,最佳静置时间为6 min;采用添加超细钨粉作为辅助黑体的比色测温方法,实现了甲烷爆炸火焰温度场的动态重构,当量比为1.06时平均温度达到最大值2263 K。研究结果有助于揭示开放空间内甲烷/空气云爆炸的特征和规律,对预防和控制甲烷意外爆炸具有重要意义。
英文摘要:
      In order to study the deflagration characteristics of methane/air under the unconstrained conditions, the gas explosion tests were carried out with latex balloons as reaction vessels, and the flame propagation velocity, explosion overpressure and temperature field distribution of methane/air premixed gas with different equivalent ratios and standing time were studied by combining the Chemkin simulation and the improved two-colour pyrometer. The results show that the flame propagation velocity was oscillating before the balloon was ruptured, and the average flame propagation velocity of the four equivalent ratios of 0.83, 1.06, 1.30 and 1.55 were 1.554 m·s-1, 2.122 m·s-1, 1.892 m·s-1 and 1.428 m·s-1, respectively. When the equivalent ratio was 1.06, R155 had the largest sensitivity coefficient, which promoted the formation of the chain reaction to produce CO2. And the chemical reaction was the most thorough and the peak overpressure value was the largest. When the standing time was set as 6min, The standing time had a significant effect on flame propagation velocity and peak explosion pressure. Dynamic temperature field of methane/air explosion flame was reconstruction using the two-colour pyrometer with the tungsten powder acting as the auxiliary black body. And the maximum value was 2263 K when equivalent ratio was 1.06. The results are helpful to reveal the methane/air explosion characteristics and law in the open space, which is of great significance for the prevention and control of methane accidental explosion.
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