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钍基熔盐堆是我国重点开发的第四代核反应堆之一,其裂变反应产生的中子俘获截面大的Kr、Xe等裂变气体以微气泡的形式存在于熔盐冷却剂中,对裂变气体的分离是提高熔盐堆中子经济性、实现燃料深燃耗的重要环节。为定量地获得分离器内气泡的分离行为,采用数值模拟和理论建模相结合的方法,得到旋流场的流场分布特征;通过建立旋流场中气泡运动控制方程,分析并计算不同旋流度和气泡直径下的分离长度。与实验数据对比发现,数值模拟结果和实验数据吻合良好,表明数值模拟方法可以用于气液分离器的优化设计。
The thorium-based molten salt reactor is one of the fourth generation of nuclear reactors that our country focuses on developing. The fission gases such as Kr and Xe with large neutron capture cross section generated by the fission reaction exist in the form of micro-bubbles in the molten salt coolant, Separation is an important part of improving neutron economy of molten salt reactor and realizing deep burnup of fuel. In order to quantitatively obtain the separation behavior of bubbles in the separator, the flow field distribution characteristics of the vortex flow field are obtained by combining the numerical simulation and theoretical modeling. By establishing the bubble motion control equation in the vortex flow field, Flow length and separation length at bubble diameter. Compared with the experimental data, it is found that the numerical simulation is in good agreement with the experimental data, indicating that the numerical simulation method can be applied to the optimal design of gas-liquid separator.