基于气固耦合的排料装置内物料运动特性数值模拟

Numerical Simulation of Material Movement in Discharging Device Based on Gas-solid Coupling Method

为探究9FH-40型揉丝机在不同工作转速下排料装置内气流与物料作用规律,采用气固耦合法(CFD-DEM)在额定转速内对不同转速的气流与物料作用过程进行了数值模拟研究.结果表明,风扇转动区域湍流强度最高,物料进入该区域后被加速,速度可达10m/s.随着风扇转速的提高,风扇转动区域气流速度及物料所受耦合力不断增加,同时波动性加强.风扇径向边缘气流速度可达40m/s.物料入口区域耦合力受风扇转速影响较小,基本维持在2.5×10-4N.物料出口区域耦合力大小的波动性则受风扇转速影响较大,不同转速下该区域耦合力大小分布在同一范围.针对分析结果,对排料装置结构改进提出了意见.

To study the interaction between air and material in discharging device of 9 FH-40 kneading machine at different rotation speeds,the interaction between air and material at different rotation speed(under the rated speed)was simulated with the gas-solid coupling method(Computational Fluid Dynamics&Discrete Element Method).The results shows that the turbulence intensity is highest in the fan rotation zone,and the material can be accelerated to 10 m/s after entering this area.The air velocity and coupling force increased with the increasing of rotation speed in the fan rotation zone.Meanwhile,the volatility of air velocity and coupling force is strengthened.The air velocity reaches to 40 m/s at the edge of the fan in the radial direction.The rotation speed of the fan has small effect to the coupling force at inlet zone,the coupling force maintains at 2.5×10-4N basically.The fluctuation of coupling force is greatly affected by fan rotation speed at outlet zone,and the distribution of coupling force in the same range under different rotation speeds.The corresponding suggestions aiming at the analysis results are proposed for improving the structure of the discharging device.