CAJ | 학술논문

为保障加速器驱动的次临界系统（ADS ）的安全，采用计算流体力学分析方法，对ADS铅铋自然循环热分层现象进行数值模拟。研究结果表明：铅铋自然循环中，热分层最严重的区域存在于变温段，且在回路中热分层状态不同。回路温差较大时，流速提高，热分层现象较明显。回路管径较大时，流速降低，热分层现象不明显。流速较低时，局部区域热分层现象趋于消失；流速较大时，最大温差截面温差加大。
위보장가속기구동적차림계계통（ADS ）적안전，채용계산류체역학분석방법，대ADS연필자연순배열분층현상진행수치모의。연구결과표명：연필자연순배중，열분층최엄중적구역존재우변온단，차재회로중열분층상태불동。회로온차교대시，류속제고，열분층현상교명현。회로관경교대시，류속강저，열분층현상불명현。류속교저시，국부구역열분층현상추우소실；류속교대시，최대온차절면온차가대。
In order to ensure the safety of the accelerator driven subcritical system (ADS) ,the numerical simulation for thermal stratification of ADS LBE natural circula‐tion was presented by using computational fluid dynamics (CFD) method .The results show that in LBE natural circulation , the most serious area of thermal stratification exists in heating zone and the hierarchical state of thermal stratification in the loop is different .When the temperature difference in the loop is bigger , the flow velocity increases ,and the thermal stratification is more obvious .When the diameter of the loop pipe is larger ,the flow velocity becomes lower ,and the thermal stratification is not obvious .When the velocity is lower ,thermal stratification of local area tends to disap‐pear .When the velocity is bigger ,the temperature difference increases in the cross sec‐tion with maximum temperature difference .