管道瓦斯爆炸流场及其影响因素数值模拟研究

发布时间：2018-03-11 14:31

本文选题：瓦斯爆炸　切入点：数值模拟　出处：《中国矿业大学学报》2017年02期 　论文类型：期刊论文

【摘要】：为了提高煤矿瓦斯抽采系统的安全防护布控能力,采用数值模拟方法对管道瓦斯爆炸传播规律及流场特征进行了仿真分析.采用涡耗散模型作为燃烧模型研究了瓦斯爆炸流场的温度、压力、速度、反应速率分布规律,以及管道直径、结构、长度对反应速率的影响.结果表明:反应速率波阵面和温度波阵面均呈""形状,且管壁约束导致反应速率加快;气体高速波与高压波部分重叠,且超前于反应速率波阵面和温度波阵面;管径越小,反应速率越大;管道弯曲处反应速率加快,近似为同管径直管的5倍;管道越长,最大反应速率峰值越大,爆炸反应程度越剧烈.管道内瓦斯爆炸剧烈程度受管径、管道长度及管道结构影响较大,瓦斯抽采系统安全防护布控时应充分考虑以上因素.
[Abstract]:In order to improve the safety protection and control ability of coal mine gas drainage system, Numerical simulation method is used to simulate the gas explosion propagation law and flow field characteristics of pipeline. The distribution of temperature, pressure, velocity and reaction rate of gas explosion flow field is studied by using vortex dissipation model as combustion model. The influence of the diameter, structure and length of the pipe on the reaction rate is obtained. The results show that both the reaction rate wave front and the temperature wave front are "" shaped ", and the tube wall constraint leads to the acceleration of the reaction rate, and the gas high velocity wave partially overlaps with the high pressure wave. The smaller the diameter of the tube, the larger the reaction rate, the faster the reaction rate is at the bend of the pipe, which is approximately 5 times that of the straight pipe with the same diameter, and the longer the pipe is, the greater the peak value of the maximum reaction rate is. The more severe the explosive reaction, the more the gas explosion intensity in pipeline is affected by pipe diameter, pipeline length and pipeline structure. The above factors should be taken into full consideration when distributing and controlling the safety protection of gas drainage system.
【作者单位】：煤科集团沈阳研究院有限公司机电安全装备研究分院;
【基金】：国家自然科学基金项目(51574148) 国家重大科学仪器设备开发专项项目(2012YQ24012705)
【分类号】：TD712.7

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