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为研究离心机中心区域流动状况,采用了直接模拟Monte-Carlo方法(DSMC)对其进行模拟。离心机参数来自于Iguassu模型,在轴对称条件下,计算区域的径向两个边界是旋转壁面,在轴向两个边界上是根据刚体平衡解设定的气体入流。通过模拟计算,验证了在稀薄气体条件下,离心机内气体旋转运动的热力学平衡状态是等温刚体运动。比较了在相同供料量不同供料速度情况下的离心机内流场,结果表明:离心机内最高温度和径向最大速度和供料速度有关,而供料量对离心机轴向速度分布有着很大影响。
In order to study the flow conditions in the centrifuge center area, direct simulation Monte-Carlo method (DSMC) was used to simulate it. Centrifuge parameters come from the Iguassu model. Under axisymmetric conditions, the two radial boundaries of the calculation area are the rotating wall surfaces and the gas inflows are set on both axial boundaries according to the rigid body balance solution. Through the simulation calculation, it is verified that the thermodynamic equilibrium state of gas rotary motion in centrifuge is isothermal rigid body motion under lean gas conditions. The results show that the maximum temperature and the radial maximum speed in the centrifuge are related to the feed speed, while the feed rate is not sensitive to the axial velocity distribution of the centrifuge Has a great impact.