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为了解消失模珠粒射料充填过程,采用Eulerian-Lagrangian方法建立了数学模型,并进行了数值模拟。在该模型中把空气处理成连续介质,采用SIMPLE方法在Euler网格中求解气相连续方程和动量方程;珠粒为离散颗粒,其运动遵循Newton运动定律。采用自行设计的模具进行了实验验证,用数码摄像机记录了珠粒充填过程。数值模拟和实验结果显示:在珠粒充填前期,模具底部空气流动速度快,携带能力强,到达模具底部的珠粒都被带到顶部堆积。珠粒充填超过2/3以后,珠粒才开始在底部堆积,最后形成一个椭圆形漩涡并逐步消失。数值模拟和实验结果符合较好。
In order to understand the process of lost foam bead injection, the Eulerian-Lagrangian method was used to establish the mathematical model and the numerical simulation was carried out. In this model, the air is treated as a continuous medium. The SIMPLE method is used to solve the gas-phase continuous equation and momentum equation in the Euler grid. The beads are discrete particles and their motions follow the Newton’s law of motion. Experiments were carried out using a self-designed mold and the bead filling process was recorded with a digital video camera. Numerical simulation and experimental results show that at the early stage of bead filling, the air flow at the bottom of the mold is fast and the carrying capacity is strong. The beads that reach the bottom of the mold are brought to the top for accumulation. Beads filled more than 2/3, the beads began to accumulate in the bottom, and finally the formation of an elliptical vortex and gradually disappear. Numerical simulation and experimental results are in good agreement.