管道中氢气-空气爆轰的多级泄爆数值模拟研究

发布时间：2018-07-08 12:47

  本文选题：管道 + 氢气　； 参考：《中国安全生产科学技术》2017年04期

【摘要】：为了研究管道内氢气的爆燃转爆轰及其抑制过程,对单个障碍物管道中氢气-空气混合物燃爆过程以及多级泄爆进行了二维数值模拟。基于氢气-空气19步详细化学反应动力学机理,以及k-ε湍流模型、概率密度函数输运方程和同位网格SIMPLE算法,采用计算流体软件Fluent进行模拟。结果表明:密闭管道无泄爆时,在距点火端1.5 m左右爆燃转为爆轰;泄爆口的位置对管道内氢气-空气预混气体的爆炸参数有重要影响,泄爆口位于管道中部时,能降低管道内爆轰超压,泄爆效果较好;位于管道中部单个泄爆口泄爆时,有效降低爆轰超压,管道中部设置2个泄爆口时,能通过压力和混合气体的泄放将管道中已经发生的爆轰衰减为爆燃;当有3个泄爆口泄爆时,管道中没有发生爆轰,达到良好的泄爆效果。
[Abstract]:In order to study the deflagration to detonation process and its suppression process of hydrogen gas in a single barrier pipe, a two-dimensional numerical simulation was carried out for the combustion process of a mixture of hydrogen and air in a single obstacle pipe and the multi-stage explosion. Based on the detailed chemical reaction kinetic mechanism of 19 steps of hydrogen and air, the K- 蔚 turbulence model, the transport equation of probability density function and the simple algorithm of in-situ grid, the computational fluid software fluent is used to simulate the chemical reaction. The results show that the detonation becomes detonation at about 1.5 m from the igniting end when there is no venting in the airtight pipeline, and the location of the vent has an important effect on the explosion parameters of the hydrogen-air premixed gas in the pipeline, and the vent is located in the middle of the pipeline. It can reduce the detonation overpressure in the pipeline, and it can reduce the detonation overpressure effectively when it is located in the middle of the pipeline with a single venting outlet, and when the middle part of the pipeline is set up with two venting openings, the detonation overpressure can be reduced effectively. The detonation occurred in the pipeline can be attenuated to deflagration through the release of pressure and mixed gas, and no detonation occurs in the pipeline when there are three venting holes, which can achieve a good venting effect.
【作者单位】： 南京工业大学安全科学与工程学院;江苏省危险化学品本质安全与控制技术重点实验室;
【基金】：国家重点研发计划项目(2016YFC0800102) 国家自然科学基金重点项目(21436006)
【分类号】：X932
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本文编号：2107480