Large-eddy Simulation of Temperature Fluctuation Characteristics of Lead Bismuth Eutectic Alloy in Triple Jet
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摘要: 为获得流动参数对铅铋合金温度振荡的影响，利用数值模拟的方法对三喷口模型中的铅铋合金温度振荡特性进行了研究。首先，基于不同湍流模型对钠流体温度振荡现象进行数值模拟，计算结果表明大涡模拟方法可准确分析出温度振荡现象，其适用于液态金属温度振荡数值分析。然后，采用大涡模拟方法对三喷口模型中的铅铋合金温度振荡进行数值计算，得到了各监测点的温度随时间的变化。最后，对比了中间出口上方监测点在不同流速比、不同流速工况下温度振荡幅度和频率，分析了不同流体速度和流速比对各监测点温度振荡特性的影响。研究结果表明，温度振荡的幅度和频率均随着流速增加而增大，主要是由于速度的增加使湍流作用增强，增加了流体流动的无序性，从而使温度振荡的幅度和频率增大。本研究得到的铅铋合金温度振荡特性可为后续铅铋快堆温度振荡研究提供参考。Abstract: In order to study influence of velocity on LBE temperature fluctuations, temperature fluctuation characteristics of lead bismuth eutectic alloy in triple jet was simulated. Firstly, three turbulent models were used to analyze temperature fluctuations characteristics of sodium in triple jet. The temperature and velocity fields at different times were evaluated and temperature fluctuation characteristics were predicted successfully by large eddy simulation (LES) and LES is suitable for analyzing temperature fluctuations characteristics of liquid metal. Secondly, LES was employed to simulate temperature fluctuation characteristics of lead bismuth eutectic alloy(LBE) in triple jet at different velocities and velocity ratios. Finally, by analyzing the influence of different velocity ratios and different velocities, it is found that the amplitude and frequency of temperature fluctuation increases as the velocity increases due to that increase of velocity enhanced turbulence. The temperature fluctuation characteristics of LBE alloy in triple jet were analyzed and it could be anticipated to support the subsequent investigation of temperature fluctuations of LBE cooled fast reactor.
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Key words:
- Temperature fluctuation /
- Large-eddy Simulation /
- Triple jet model
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图 8 不同冷热流体速度比的温度振荡幅度
Figure 8. Temperature Fluctuation Amplitude of Different Velocity Ratios
图 11 不同冷热流体速度的温度振荡幅度
Figure 11. Temperature Fluctuation Amplitude of Different Velocities
图 13 相同流速比不同冷热流体速度的温度振荡幅度
Figure 13. Temperature Fluctuation Amplitude of Different Velocities
表 1 监测点位置
Table 1. Monitoring Point Position
监测点序号 X/mm Y/mm Z/mm A1 15 0 60 A2 15 0 100 A3 15 0 150 A4 15 0 200 B1 35 0 60 B2 35 0 100 B3 35 0 150 B4 35 0 200 C1 65 0 60 C2 65 0 100 C3 65 0 150 C4 65 0 200 
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表 2 不同工况的边界条件参数
Table 2. Boundary Condition of Different Cases
工况 两侧喷口 中间喷口 热流体流速
$ {V}_{\mathrm{h}} $/(m·s−1)$ {T}_{\mathrm{h}} $/K 冷流体流速
$ {V}_{\mathrm{c}} $/(m·s−1)$ {T}_{\mathrm{c}} $/K 1 0.5 620.85 0.5 577.65 2 0.5 620.85 0.25 577.65 3 0.25 620.85 0.5 577.65 4 1 620.85 1 577.65 5 2 620.85 2 577.65 6 2 620.85 1 577.65
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