海洋条件下反应堆热工水力参数的子通道计算

针对海洋条件下反应堆的子通道热工水力分析,建立了海洋运动附加力模型和瞬态入口边界,将起伏、摇摆及复合运动的附加力关系式用于子通道模型的轴向和横向动量方程,并应用到COBRAⅢC程序将其改造为适应海洋条件的反应堆子通道分析程序。作为验证,计算了加热实验通道和"奥陆"堆在起伏运动情况下热通道的临界热流密度比(CHFR)、出口空泡份额和冷却剂流量,并与文献结果对比。还详细计算了"奥陆"堆在起伏、不同摇摆中心和复合运动情况下,热通道的CHFR和不同位置子通道出口的热工水力参数。研究表明:海洋条件下反应堆的子通道热工水力参数随运动呈周期性变化;起伏运动对子通道的压降影响较大,摇摆运动对子通道冷却剂的流量和温度影响较大。

Sub-channel Analysis on Thermal-hydraulic Characteristic of PWR under Ocean Condition

According to the thermal-hydraulic analysis of sub-channel, additional force models of heaving, rolling and complex movement under ocean conditions were established and applied to the sub-channel momentum equation in COBRA ⅢC sub-channel analysis code. The inlet boundary of ocean conditions was also established in this paper. The critical heat flux ratio, exit void fraction and coolant flow of the hot channel were calculated for MUTSU reactor and experiment heating tube, and the results were compared with the experiment data from literature. Calculated thermal-hydraulic characteristics of MUTSU reactor were studied under ocean conditions. The research results show that thermal-hydraulic parameters are varied periodically under fluctuating of ocean conditions. The heaving motion has a large impact on pressure drop of the sub-channel. The sub-channel coolant flow and temperature are greatly influenced by swing motion.