Study on the Effect of Inclination Angle on the Natural Convection of Molten Salt in Heat Pipe Cooled Molten Salt Reactor Core
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摘要: 热管熔盐堆堆芯倾角对堆芯温度分布和局部热点具有重要影响。为获得堆芯在不同倾角下内部熔盐的自然对流换热特性、优化堆芯设计和提高系统安全性，对堆芯进行三维建模，通过Fluent软件进行数值模拟，对横置和竖置放置2种情况下堆芯内熔盐自然对流的温度场和流场进行了分析，同时讨论了堆芯倾角变化对堆芯温度场及局部热点的影响。研究结果表明：局部热点始终出现在堆芯上部，相对于竖置，横置时堆芯温度场及流场更加不稳定。当倾角在5°~10°范围内，局部热点温度最高，竖置时热点温度最低。模拟结果揭示了堆芯内熔盐的自然对流特性，并为热管熔盐堆热工方面的概念设计提供了一定参考。Abstract: The inclination angle of heat pipe-cooled molten salt reactor (MSR) core has an important influence on the core temperature distribution and local hot spots. In order to obtain the natural convection heat transfer characteristics of molten salt in the core at different inclination angles, optimize the core design and improve the system safety, the three-dimensional modeling of the core is carried out, and the temperature field and flow field of the natural convection of molten salt in the core are analyzed for both horizontal and vertical placement by numerical simulation with the software Fluent. At the same time, the influence of core inclination angle change on the core temperature field and local hot spots is discussed. The results show that the local hot spots always appear in the upper part of the core, and the temperature field and flow field of the core are more unstable when the core is placed horizontally than vertically. When the inclination angle is in the range of 5°-10°, the local hot spot temperature is the highest, and the hot spot temperature is the lowest when the core is vertical. The simulation results show the natural convection characteristics of molten salt in the core, and provide a reference for the thermal design of the heat pipe-cooled MSR.
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Key words:
- Heat pipe-cooled MSR /
- Inclination angle /
- Natural convection /
- Heat transfer
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图 3 热管熔盐堆堆芯不同的布置方式
θ—倾角
Figure 3. Different Arrangements of Heat Pipe-cooled MSR Cores
图 6 大空间堆芯横置热管与熔盐换热的模型验证
Figure 6. Model Verification of Heat Exchange between Horizontal Heat Pipe and Molten Salt in Large Space Core
图 7 大空间竖置热管与熔盐换热的模型验证
Figure 7. Model Verification of Heat Exchange between Vertical Heat Pipe and Molten Salt in Large Space
图 8 管排与熔盐换热的模型验证
Figure 8. Model Verification of Heat Transfer between Pipe Array and Molten Salt
图 9 竖置式热管熔盐堆堆芯温度云图
Figure 9. Temperature Contour of Vertical Heat Pipe-cooled MSR Core
图 10 竖置式热管熔盐堆堆芯x=0截面的速度矢量图
Figure 10. Velocity Vector Diagram of x=0 Section of Vertical Heat Pipe-Cooled MSR Core
图 11 横置式热管熔盐堆堆芯温度云图
Figure 11. Temperature Contour of Horizontal Heat Pipe-cooled MSR Core
图 12 横置式热管熔盐堆堆芯横截面的速度矢量图
Figure 12. Velocity Vector Diagram of Across Section of Horizontal Heat Pipe-cooled MSR Core
图 13 横置式热管熔盐堆堆芯横截面的流线图
Figure 13. Streamline Diagram of Across Section of Horizontal Heat Pipe-cooled MSR Core
图 14 不同倾角下堆芯的温度云图
Figure 14. Temperature Contours of the Core at Different Inclination Angles
图 15 不同倾角下堆芯y轴顶部的轴向温度分布图
Figure 15. Axial Temperature Distribution of y-axis Upper Part of the Core at Different Inclination Angles
图 16 不同倾角下堆芯z轴顶部的径向温度分布图
Figure 16. Radial Temperature Distribution of z-axis Top of the Core at Different Inclination Angles
图 17 不同倾角下堆芯局部热点温度与平均对流换热系数
Figure 17. Local Hot Spot Temperature and Natural Convection Heat Transfer Coefficient of the Core at Different Inclination Angles
表 1 热管熔盐堆堆芯参数表
Table 1. Main Parameters of Heat Pipe-cooled MSR Core
参数 数值 堆芯热功率/kW 30 堆芯高度/mm 620 堆芯直径/mm 350 热管数量/根 37 热管中心距/mm 48.73 热管直径/mm 32 热管长度/mm 620 
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表 2 熔盐的物性性质
Table 2. Physical Properties of Molten Salt
物性参数 数值 熔盐成分 72.5LiF-27.5UF4 熔点/K 858 密度/(kg·m−3) 6105−1.272Tsalt 比热容/(J·kg−1·K−1) 1000 动力粘度/(Pa·s) 0.07696·exp[(4976/Tsalt)/1000] 热导率/(W·m−1·K−1) 1.1
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