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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.
In order to improve the safety protection and control ability of coal mine gas drainage system, the numerical simulation method was used to simulate the propagation law and flow field characteristics of gas explosion in pipeline.The vortex dissipation model was used as combustion model to study the gas explosion temperature, pressure , Velocity and reaction rate, as well as the effects of pipe diameter, structure and length on the reaction rate were investigated.The results show that the reaction rate wave and temperature wave fronts have a shape of “<” Speed gas wave and high-pressure wave partially overlap, and ahead of the reaction rate wavefront and temperature wavefront; the smaller the diameter, the greater the reaction rate; the faster the reaction rate at the bend of the pipe, The longer the pipeline, the greater the peak of the maximum reaction rate, the more severe the explosion reaction.The severity of the gas explosion in the pipeline is greatly affected by the pipe diameter, pipe length and pipe structure, and the safety control of the gas drainage system should be fully considered when distributing the control factor.