中文摘要：

在自行设计的新型玉米籽粒膨化机的基础上,利用Fluent软件提供的动网格计算方法和物理模型,考虑膨化机内部气体的高温高压特性,对膨化机快开门盖的运动过程进行动态数值模拟。通过动网格的生成与消亡,较好地解决因门盖运动所导致的计算区域瞬时变化问题。得到膨化机在不同内部压力、筒体大小及接管管径下,门盖所受压力、能达到的最大速度等特性的可视化仿真结果。结果表明：膨化机门盖运动的最大速度随着膨化机内部压力和膨化机筒体体积的增加而增大,其所具有的能量随着接管管径的增大而增加。

英文摘要：

The movement of the quick actuating valve of expanding machine was simulated by using the calculation and physical models of Fluent software, considering the condition of the gas with high temperature and pressure, and this was newly self-designed for the corn grain. The problem of regional instaneous change in calculation area resulted by valve moving was well solved with generation and disappearance of dynamic mesh. The visualization simulation results of the pressure on the valve and the maximum velocity of the valve, produced at different internal pressure, volume, and the pipe diameter were. The results showed that the maximum velocity of the quick actuating valve of expanding machine increaseed with the inter nal pressure and the volume of the expanding machine, and the ener- gy of the valve increases with the pipe diameter.