重力驱动下漏斗出口形状及振动因素对颗粒流的影响分析

Analysis of the Effect of Funnel Outlet Shape and Vibration Factors on Particle Mass Flow under Gravity

为了深入了解漏斗颗粒在外部激励下的运动状态,本文基于离散元方法,探究了重力驱动下漏斗出口倾角、振动幅值、振动方向、颗粒竖向初始速度以及是否加装出口挡板对于颗粒流流量的影响。结果表明:出口倾角和振动幅值的增大都有利于颗粒流量的增加;在不考虑初始速度和挡板情况下,当振动方向由水平逐渐转向竖直这一过程中,颗粒流量随之减小,并且在水平方向振动时,颗粒流量达到最大值,而在加装出口挡板和考虑初始速度两种情况下,结果与之相反;在出口无挡板且振幅为零的条件下,赋予颗粒物质竖直方向速度有益于流量的增加,随着振幅的增大,流量稳步提高,但增长幅度均低于相同环境下无竖直方向速度的流量增长幅度;出口的挡板在低振幅下不利于颗粒物质的排出,但在提高振幅且振动方向逐步转向竖直方向后,颗粒流量大幅提高。

In order to gain a deeper understanding of the motion state of funnel particles under external excitation,this paper,based on the discrete element method,explores the influence of outlet dip ngle,vibration amplitude,vibration direction,vertical velocity of particles and whether to install the outlet bundle device on the particle flow rate under the gravity-driven funnel flow mode.The experimental results show that the increase of outlet angle and vibration amplitude is conducive to the increase of particle flow rate.Without considering the initial velocity and baffle,as the vibration direction gradually shifts from horizontal to vertical,the particle flow rate decreases accordingly.When the vibration direction is horizontal,the particle flow rate reaches the maximum value.However,the result is opposite when the bunching device is installed and the vertical velocity is set.Under the condition that the outlet is not bunching and the amplitude is zero,the vertical velocity is beneficial to the increase of the flow rate.With the increase of the amplitude,the flow rate increases steadily,but the growth rate is lower than that of the flow rate without vertical velocity in the same environment.The baffle at the outlet is not conducive to the discharge of particulate matter under low amplitude,but after increasing the amplitude and gradually turning the vibration direction towards the vertical direction,the particle flow rate increases significantly.