带管道连接的空间中悬浮铝粉尘爆轰波传播数值模拟

为研究悬浮铝粉尘爆轰及效应的问题,采用两相流模型数值研究了铝粉尘与空气当量比为1时,浓度0.304 kg·m~(-3),铝颗粒半径为2.0μm,悬浮铝粉尘爆轰波在通过管道连接的空间内的发展传播过程,用数值模拟得到了爆轰波的点火起爆及爆轰波传播、反射和绕射过程的压力、温度分布。结果表明,在模拟区域左侧的密闭空间中,爆轰波与壁面产生反射形成6.5 MPa局部高压区,而爆轰波与两壁产生的反射波的相互作用会形成18 MPa的局部高压区。爆轰波能通过绕射传播进入管道内,并在接近管道出口处速度能到达1571 m·s~(-1),压力能达到2.85 MPa,接近稳定传播状态。爆轰波通过绕射传播进入右侧空间中,在管道出口处绕射形成对称低压低密度区域,爆轰波压力和爆速下降,在右侧空间内继续传播。计算区域内的爆轰波后大部分区域温度保持在3400 K以上。

Numerical Simulation of Detonation Wave Propagation of Suspending Aluminum Dust in a Space Connected by Channel

To study the problem of detonation and effect for suspended aluminum dust,the development propagation process of detonation wave for suspended aluminum dust with a concentration of 0.304 kg · m-3 for the equivalence ratio of aluminum dust and air as 1 and a radius of 2.0 μm for the aluminum particles in the space connected by channel were numerically investigated by the two-phase flow model.The ignition initiation of detonation wave and the pressure and temperature distribution of the propagation,reflection and diffraction processes of detonation wave were achieved by numerical simulation.Results show that the detonation wave is reflected at the wall to form a 6.5 MPa local high pressure zone in the left side of enclosed space in simulated area,whereas the interaction of detonation wave with the reflected waves generated by the two walls can form a local high pressure zone of 18 MPa.Through diffraction,the detonation wave can propagate into the channel and reach the speed of 1571 m · s-1 and the pressure of 2.85 MPa near the exit of channel,closing to the stable propagation state.Through diffraction,the detonation wave can propagate into the right side of space and form a symmetrical low-pressure low-density area at the exit of the channel,the pressure of detonation wave and detonation velocity decrease,continue to spread in the right side of space.The temperature of the most of the region behind detonation wave in calculation area remains above 3400 K.