中文摘要：

双级活塞推料离心机是连续操作的离一tl,机的一种，广泛应用于轻工、化工、冶金、煤炭等行业。双级活塞推料离心机的一级转鼓由于在旋转运动的同时又进行往复运动，流体在转鼓内的流动过程极为复杂，尚没有理论方法能够描述其过滤分离的过程。以P-100型双级活塞推料离心机为例，运用FLUENT软件进行数值模拟，得到了离心机转鼓内的流体流动状态。并针对影响离心机生产能力和分离效果的物料浓度与转鼓旋转角速度进行了模拟研究，结果表明，随着进料浓度的增大，滤饼固含量、固相回收率和澄清液含固率都呈现不断变大的趋势，而离心分离达到稳定的最初时间和滤饼达到最大固含量的最初始轴向坐标值逐渐变小；随着转速的增加，固相回收率、澄清液含固率和滤饼达到最大固含量的最初始轴向坐标值逐步变小，滤饼固含量不断增大，而离心分离达到稳定的最初时间没有特定的规律。同时，数值模拟结果还为离心机结构的优化设计提供了依据。

英文摘要：

The two-stage pusher centrifuge is a kind of continuous operation centrifuges, and is widely used in light industry, chemical industry, metallurgy, coal and other industries. As the first-stage drum does rotation movement and reciprocating motion at the same time, the fluid flow in it is extremely complex, and there is no yet theoretical method to describe the filtration separation process. Therefore, taking a p-100-type two-stage pusher centrifuge for example, this paper used FLUENT software to simulate it and to obtain the fluid flow situation within the centrifuge drum. At the same time, the feeding concentration and drum rotational speed parameters were changed to examine the influence of them on centrifuge separation. The results show that, as the feed concentration increases, the cake solids content, the recovery ratio of solid phase and the solid containing ratio of supernatant show the trend of becoming larger, while the initial time for the centrifuge separation to reach its stable state and the initial axial coordinate for the cake to reach its maximum solid content are reduced; with increasing rational speed, the recovery ratio of solid phase, the solid containing ratio of supernatant and the axial coordinate of the cake reach its maximum solid content become gradually smaller, while cake solid content is increasing, and there is no specific rule for the initial time of the centrifuge separation to reach its stable state. The results provide a series of references to optimize the design of the centrifuge structure.