瓦斯爆炸冲击波在变径管道中的传播特性

Propagation Characteristics of Gas Explosion Shock Waves in Variable Diameter Pipes

摘要: 为了研究管道截面突变对瓦斯爆炸冲击波的传播特性影响，利用ANSYS/LS-DYNA建立变径管道模型，在管道封闭端填充长度0.4 m，9.5%浓度的瓦斯混合气体，对瓦斯爆炸冲击波在变径管道内的传播特性进行了数值模拟。测得了变径管道中心，管道壁面处各测点的速度、超压。结果表明：瓦斯爆炸产生的爆炸波在管道变径区域发生了复杂反射并出现了反流现象，加大了管道变径区域的爆炸强度，使得爆炸波通过变径截面后的短时间内，出现了更高的二次超压峰值，且对管道壁面的冲击也更为严重。因此在对井下巷道进行开拓设计时，为应对可能发生的瓦斯爆炸灾害，应避免井下巷道面积突变或减缓巷道面积的变化程度。

Abstract: In order to study the propagation characteristics of gas explosion shock wave in pipeline section, using ANSYS/LS-DYNA to establish the variable diameter pipe model, the gas mixture gas with a length of 0.4 m and a concentration of 9.5% is filled at the closed end of the pipe, and the propaga-tion characteristics of the gas explosion shock wave in the variable diameter pipe are simulated numerically. The velocity and overpressure of each measuring point at the pipe center and the pipe wall were measured. The results show that: The explosion wave from the gas explosion has a com-plex reflection and a reflux in the pipe diameter area, increased explosive intensity in the pipe di-ameter area. In the short time after the explosion wave passed through the diameter cross-section, there was a higher secondary overpressure peak, and the impact on the wall of the pipe was more serious. Therefore, in the development design of underground roadway, in order to deal with the possible gas explosion disaster, it is necessary to avoid sudden change of roadway area or slow down the variation degree of roadway area.