矩形坑道内爆炸冲击波压力仿真计算及试验验证

Simulation calculation and test verification of detonation wave pressure in rectangular tunnels

针对坑道试验爆轰波传播进行研究,通过数值模拟手段获取不同爆心距处坑道侧壁超压时程曲线,并通过试验手段,验证了数值模拟模型正确性.对比数值模拟结果和试验数据,发现坑道试验将混合装药等效TNT质量后,数值模拟超压峰值与实测误差范围为8.49%~25.49%,在距爆心15m外数值模拟误差较小;等截面坑道内,爆轰波在近爆心处峰值超压相差较为明显,反映近爆心爆轰波较为紊乱.随着距爆心越远,等截面处峰值压力趋于一致,表明爆轰波呈稳定传播状态.研究结果表明,坑道内爆试验将混合装药等效为TNT当量,采用数值模拟研究坑道不同位置峰值超压方法可行性,为坑道试验超压测试传感器量程、规格选择提供理论指导,为坑道内侵爆类弹药爆炸毁伤效应评估等提供支撑.

This paper studies the tests of detonation wave propagation in tunnels,obtains the overpressure time course curve of the sidewall of a tunnel at different blast center distances by numerical simulation,and verifies the correctness of the numerical simulation model by experimental means.By comparing the numerical simulation results and the test data,it is found that,after mixing the equivalent TNT mass of the charge in the tunnel tests,the error range between the numerical simulation overpressure peak and the measured data is within 8.49%to 25.49%,and the numerical simulation error is small when the distance from the blast center is over 15 m.In the equal section tunnel,the peak overpressure difference of the blast wave at the near blast center is more significant,reflecting that the blast wave near the blast center is more disordered.With a longer distance from the blast center,the peak pressure at the same section becomes consistent,indicating that the detonation wave is in a stable propagation state.The research results show that the mixed charge is equivalent to TNT equivalent in the tunnel implosion test,and the feasibility of the peak overpressure method at different locations in the tunnel is studied by using numerical simulation,which provides theoretical guidance for the measurement range and specification selection of the overpressure test sensors in the tunnel test.It also provides support for the evaluation of the explosion damage effect of the tunnel intrusion-explosive munitions.