大颗粒气力输运的CFD与EDEM耦合计算方法

Calculation Method of Particle Pneumatic Transport Based on CFD and EDEM Coupling

为掌握冰雹颗粒抛射运动过程规律,以支撑冰雹抛射装置设计,需进行冰雹颗粒气力输运过程计算。通过计算流体力学与离散单元法双向耦合进行冰雹等大颗粒气力输运问题的模拟仿真。通过进行不同气源压力、不同抛射管径、不同抛射管长、不同冰雹流量条件下的计算及对比,得到随着气源压力的增大,冰雹抛射速度逐渐增大,气流流量逐渐增大;随着抛射管径的增大,冰雹速度逐渐增大,气流流量平方级增长;随着抛射管长的增大,冰雹速度基本保持不变,气流流量略有减小;随着冰雹流量的增大,冰雹速度逐渐减小,气流流量逐渐减小。

In order to master the rules of particle ejection and support the design of hail ejection device,the pneumatic transprot of hail particles should be calculated.Numerical simulation of pneumatic transport of large particles,such as hail,was carried out by establishing bidirctional coupling of computational fluid dynamics and discrete element method.Different gas source pressure,different projectile diameter,different projective length and different hail flowrate were calculated and compared.Results show these follows.With the increase of gas pressure,hail velocity and air flowrate increase.With the increase of projectile diameter,hail velocity increase gradually and air flowrate increases in square order.With the increase of projectile length,hail velocity remains unchanged and air flowrate decreases slightly.With the incresae of hail flowrate,hail velocity and air flowrate decrease.