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为了清楚地了解离心机级联中轻杂质的传播与分布,对利用离心法获取同位素过程中存在的轻杂质问题进行了数值模拟。根据实际的物理过程,建立了新的质量损失模型及轻杂质(HF)产生模型。数值模拟中将反映物质守恒的微分方程进行差分处理,以W F6为工作介质,考虑腐蚀损耗、供料中的轻杂质及离心机级联系统漏率,求解差分方程组,得到了离心级联中各组分的丰度分布,并与旧的模型进行了比较。数值计算结果显示新模型得到的轻杂质丰度在精料端的积累量远高于旧模型,理论上该模型能够更准确地反映离心级联中轻杂质传播与分布情况。
In order to clearly understand the dissemination and distribution of light impurities in the centrifuge cascade, the numerical simulation of light impurities existing in the process of isotope extraction by centrifugation was carried out. According to the actual physical process, a new model of mass loss and a model of light impurity (HF) generation are established. The differential equations which reflect the conservation of matter are processed numerically in the numerical simulation. Taking W F6 as the working medium, the corrosion loss, the light impurities in the feedstock and the leakage rate of the centrifuge cascade system are taken into account to solve the differential equations. The abundance distribution of each component is compared with the old model. The numerical results show that the light impurity abundance obtained by the new model is much higher than that of the old model at the concentrate end. In theory, this model can more accurately reflect the propagation and distribution of light impurities in the centrifugal cascade.