【摘要】 采用标准k-ε湍流模型和颗粒轨道模型模拟了水平撞击流反应器内的气相流场和颗粒运动,实验采用压力计和PV4A光纤速度测量仪测量了整体压力损失和颗粒沿喷嘴轴线的速度变化,模拟得到的规律和实验结果基本吻合。通过模拟还得到了单侧颗粒进料时的颗粒运动特征、颗粒的最大渗透深度和平均飞行时间等信息。结果表明,撞击区域集中在2～3倍喷嘴直径范围之内,气流场的速度和压力呈对称分布,颗粒进入反向气流后速度急剧衰减,最大渗透深度约为喷嘴直径的2倍,颗粒的平均飞行时间在0.7 s～1.8 s之间。随着喷嘴气流速度的增加,颗粒物料更容易被气流带走。更多还原

【Abstract】 Standard k-εturbulence model and particle trajectory model were used to simulate 3-D gas-solid flow in Impinging Streams Reactor.Pressure drop and particle velocity was measured using manometer and PV4A Fiber Optic Reflection Probe respectively.Sim- ulation results were found in agreement with experimental data basically.Information such as particle trajectory,particle maximal depth of penetration and mean flying time were also estimated through simulation.The results indicated that impinging zone was about 2～3 times the size of the nozzle diameter,gas velocity and gas pressure was distributed symmetrically.Particle axial velocity decreased sharply when entering the reverse gas flow and the maximum penetration distance was about twice the size of the nozzle diameter,irre- spective of the gas velocity at the nozzle.Mean flying time of particles was about 0.8 s～1.7 s and decreased with the increase of gas velocity.Particles were much easier to be brought out from the top of the reactor when increasing the gas velocity.更多还原