掘进工作面瓦斯爆炸风门冲击载荷的数值模拟

Numerical simulation study on impact load of gas explosion damper in tunneling face

为了研究不同体积瓦斯爆炸条件下风门的冲击载荷变化规律,运用流体力学软件Fluent,结合宁煤集团羊场湾煤矿实际情况,对掘进工作面瓦斯爆炸传播过程进行了数值模拟,得到了瓦斯积聚范围对风门冲击载荷的影响规律。结果表明:直巷风门和支路风门的冲击载荷在前驱压力波的作用下出现第一次峰值,在反射冲击波的作用下出现第二次峰值;直巷风门的载荷峰值与瓦斯积聚范围近似为二次函数关系,支路风门的载荷峰值与瓦斯积聚范围近似为线性函数关系;随瓦斯积聚范围增加,支路风门的二次载荷峰值逐渐逼近甚至超过一次载荷峰值;瓦斯积聚范围超过50 m时,依据超压破坏准则,支路风门和直巷风门的载荷峰值均超过破坏载荷,两风门先后发生破坏。

To study the change law of impact load of damper under the conditions of different gas volume explosion,Combining the actual situation of Yangchangwan Coal Mine of Ningmei group with the help of ANSYS Workbench numerical simulation platform,a three-dimensional geometric model was constructed.The process of a gas explosion and propagation in heading face was numerically simulated by using the fluid dynamics software Fluent,and the influence law of gas accumulation range on the impact load of the damper was obtained.The results show that:under different explosion conditions of gas accumulation range,the impact load of straight and branch air doors has the same change process in the stage of precursor pressure wave,the stage of pressure drop,the stage of secondary recoil and the stage of residual wave;the impact load of straight and branch air doors has the first peak under the effect of precursor pressure wave,and the second peak under the effect of reflected shock wave The results show that with the increase of gas accumulation range,the corresponding time of the primary load peak of the straight air door and the branch air door is advanced;under the same gas accumulation range,the corresponding time interval of the primary load peak of the straight air door and the branch air door is shortened;the relationship between the load peak of the straight air door and the gas accumulation range is approximately a quadratic function;the relationship between the load peak of the branch air door and the gas accumulation range is similar;with the increase of gas accumulation range,the secondary load peak value of branch air door gradually approaches or even exceeds the primary load peak value;when the gas accumulation range exceeds 50 m,according to the overpressure failure criterion,the load peak value of the branch air door and straight air door exceeds the failure load,and the two air doors are damaged successively.