铝粉尘云团爆轰温压效应的数值模拟

摘要

为研究粉尘云团形成的爆轰波在空气中传播过程及对周围环境的温压效应和毁伤规律,采用时-空守恒元解元算法两相流模型模拟了当量比为1,颗粒半径为2.μm的悬浮铝粉尘均匀分布形成的半径3.0m的云团在空气中的爆轰波传播过程.研究结果表明:在冲击波到达云团边界处3.0m位置时压力达到最大值2.10 MPa,而后压力产生衰减;冲击波到达4.7m时铝粉尘全部反应完毕无剩余;铝粉尘反应形成的火球会向外运动可到达10.Om处,火球内中心区域为温度3 500 K以上、密度0.120 kg/m3的高温低密度区域;冲击波到达24.5 m处超压为0.10 MPa,达到致人死亡标准;冲击波到达28.0 m处时超压为0.09 MPa,可致人严重损伤.%In order to study the temperature and pressure effects of the detonation wave generated by dust clouds in the surrounding environment and its damage law,the two-phase flow model and space-time conservation element and solution element method are used to simulate the propagation of 3.0 m radius detonation wave in the air,which is formed by uniformly distributing the suspended aluminum dust with the equivalence ratio of 1 and the particle radius of 2 μm.The pressure reaches to maximum of 2.10 MPa when the detonation wave arrives at 3.0 m from the boundary of cloud,and then the pressure will decrease.The reaction of aluminum dust particles is completed without surplus at 4.7 m from the boundary of cloud.The fireball formed by the dust reaction move outwards to reach at 10 m from the boundary of cloud.The central area of fireball is a high-temperature and low-density area with temperature of above 3 500 K and density of 0.120 kg/m3.The overpressure reaches to 0.10 MPa when the propagation distance of shock wave arrives at 24.5 m from the boundary of cloud.The overpressure reaches to 0.09 MPa when the shock wave arrives at 28.0 m from the boundary of cloud,which can cause serious injury to the human body.