Numerical Simulation of Thermal Striping in Pressurizer Surge Line
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摘要: 对波动管内热纹振荡现象展开研究,获得波动管内热纹振荡现象的产生原因以及启堆升功率工况下热纹振荡现象造成波动管内壁面温度振荡的幅值和频率。采用计算流体力学(CFD)方法中的动态Smagorinsky涡粘模型对波动管内热纹振荡现象进行了数值模拟。结果表明:波动管内产生热振荡现象的原因是冷热流体相对流动所产生的涡状流使得冷热交界面产生上下振荡;波动管内的热纹振荡现象使得波动管内壁面温度的振荡幅值在4~20℃范围内,频率低于5 Hz。Abstract: This paper studies the thermal striping in the pressurizer surge line to find the reason causing the phenomenon and acquire the temperature oscillation frequency and amplitude during reactor heat up processes. Numerical studies on the thermal striping were carried out by using dynamic Smagorinsky eddy viscosity model. The simulation results show that the vortex caused by contrary flew between hot and cold fluid around the interface is the reason for the thermal striping. Thermal striping in surgeline makes the temperature of the pipe inner wall oscillate from 4℃ to 20℃and the frequency is lower than 5 Hz.
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Key words:
- Surge line /
- Thermal striping /
- Dynamic large eddy simulation /
- Numerical simulation
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