双重非均匀弥散燃料RPT方法分析

采用传统均匀打混模型计算具有双重非均匀性的弥散燃料会带来一定的计算偏差。本文根据双重非均匀处理判定公式,分析弥散燃料均匀打混模型计算偏差与各因素的关系,指出针对较高富集度或较大颗粒尺寸的燃料,采用传统均匀打混模型会带来较大的计算偏差。然后采用RPT方法对不同富集度和不同颗粒尺寸的弥散燃料进行分析,结果显示RPT方法可以用于双重非均匀性的弥散燃料的计算分析,且计算精度与颗粒模型相当。

The traditional volumetric homogenization method on fuel with double heterogeneity will bring a certain calculation derivation. In the paper, from the DH inequality criterion, the relationship between the calculation deviation of volumetric homogenization method and various factors on the dispersed particle-type fuel is analyzed. It is pointed out that for high enrichment or large size fuel particles, the traditional volumetric homogenization method will bring a large calculation deviation. And then RPT method was used to treat dispersed particle-type fuel, the results show that the RPT method can be used to treat the dispersed particle-type fuel which has double heterogeneity, and the calculation accuracy is similar to that of the particle model.