管道瓦斯爆炸流场及其影响因素数值模拟研究  

Numerical simulation of gas explosion flow field characteristics and influencing factors in pipelines

作　　者：祝钊 

机构地区：[1]煤科集团沈阳研究院有限公司机电安全装备研究分院,辽宁抚顺113122

出　　处：《中国矿业大学学报》2017年第2期300-305,共6页Journal of China University of Mining & Technology

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)

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.Propagation rules and flow field characteristics of gas explosion were simulated by numerical simulation method in order to improve the security protection of coal mine gas drainage system.The distribution regularities of gas explosion flow field on the temperature,pressure,velocity and reaction rate and the effect of pipe diameter,structure and length on reaction rate were investigated by eddy-dissipation model.The results show that both the reaction rate wave front and the temperature wave front are in the shape of ＂〈＂,and the confinement of tube wall leads to the increase of reaction rate.Speed and pressure waves are overlapped and ahead of the reaction rate and temperature waves.The smaller the diameter,the greater the reaction rate.The reaction rate increases at the bent of pipeline,which is 5times of straight pipes with the same diameter.The longer the pipe length,the greater the maximum reaction rate peak,and the more violent explosive reaction.These factors should be taken into account to the safety protection of gas drainage system as the intensity of gas explosion in pipeline is greatly affected by pipe diameter,length and structures.

关 键 词：瓦斯爆炸 数值模拟 涡耗散模型 流场特征 反应速率 

分 类 号：TD712[矿业工程—矿井通风与安全]