密闭巷道内瓦斯爆炸超压场的数值模拟研究

应用计算流体动力学软件AutoreaGas定量研究了截面为3 m×3 m、长25 m的一段密闭巷道中瓦斯爆炸超压场. 通过数值模拟手段分析了障碍物的形状和大小对密闭巷道中瓦斯爆炸超压的影响，确定了形成最大爆炸超压时巷道内的最佳阻塞比，并在最佳阻塞比的障碍物填装条件下，研究了不同瓦斯浓度对爆炸超压的影响. 结果表明，瓦斯空气混合物爆炸超压随着阻塞比的增大呈现先增大后减小的趋势，在7.5%、8.5%、9.5%、10.5%、11.5% 5种瓦斯浓度下，爆炸超压随着浓度的增大呈现先增大后减小的趋势，当阻塞比为26.6%时，爆炸超压在9.5%时达到峰值.

Numerical Simulation of Overpressure Field of Gas Explosion in Confined Roadway

Overpressure field of gas explosion in a confined roadway was studied via CFD software named AutoreaGas. The length of roadway is 25 meters with a section area size of 3 m×3 m. Shape and size of obstacles were simulated to obtain their influences on the overpressure caused by gas explosion, which confirmed the optimum blockage ratio corresponding to the peak value of overpressure. Based on the results obtained, the influence caused by gas concentration was also studied under optimum blockage ratio. All the simulation results show that the overpressure reaches a peak value and then falls down with the increases of blockage ratio as well as the gas concentration. And the optimum blockage ratio for this roadway is 26.6%, under which the overpressure reaches its peak value when the gas concentration is 9.5%.