Numerical Simulation Research on Three-dimensional Temperature Field and Flow Field at the Top of Reactor under Natural Convection Conditions
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摘要: 压水堆核电厂堆顶设备较多，温度场和流场复杂。为评估采用自然对流对控制棒驱动机构（CRDM）进行冷却的可行性。基于FLUENT软件，对自然对流工况下堆顶结构开展数值模拟研究，得到4种工况下的流场、温度场分布及线圈最高温升。模拟结果表明，不同运行工况下，采用自然对流的方式均能将CRDM运行产生的热量完全带出堆坑，不存在堆坑窝热情况，CRDM线圈温度均不会超过其工作温度限值。为采用自然对流对CRDM进行冷却提供了重要依据。Abstract: There are many equipment at the top of reactor in PWR, and the temperature and flow fields are complex. In order to evaluate the feasibility of cooling the control rod drive mechanism (CRDM) by natural convection, based on FLUENT software, the numerical simulation of the reactor top structure under natural convection conditions was carried out, and the flow field, temperature field distribution and the maximum coil temperature rise under four conditions were obtained. The simulation results show that under different operating conditions, the heat generated by CRDM operation can be completely taken out of the pit by natural convection, and there is no pit heat. The coil temperature of the CRDM will not exceed its operating temperature limit. This research can provide an important basis for cooling the CRDM using natural convection.
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Key words:
- PWR /
- CRDM /
- Temperature field /
- Natural convection
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图 5 工况1下的温度场和速度场分布
Figure 5. Distribution of Temperature Field and Velocity Field under Condition 1
图 6 工况2下的温度场和速度场分布
Figure 6. Distribution of Temperature Field and Velocity Field under Condition 2
图 7 工况1下各线圈温度
自下而上：保持线圈、移动线圈、提升线圈
Figure 7. Temperature of Each Coil under Condition 1
图 8 工况2下各线圈温度
自下而上：保持线圈、移动线圈、提升线圈
Figure 8. Temperature of Each Coil Under Condition 2
图 9 工况3和工况4下的温度场分布
Figure 9. Distribution of Temperature Field under Condition 3 and Condition 4
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