Study on Stability of Natural Circulation of LBE in Rectangular Circuit
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摘要: 为了对矩形回路铅铋自然循环流动稳定性进行分析，得到影响自然循环流动的因素及其作用规律，采用时域法，开发一维系统程序FRTAC对铅铋自然循环进行数值计算，分析处理动态时序判定其稳定特性，获得了铅铋自然循环在相关工况条件下的稳定域与稳定性边界、铅铋自然循环回路的流动稳定性特性，以及影响因素与规律。研究表明，增大回路加热段长度会使系统的稳定性增强，而增大流道直径以及冷热段心位差均会使系统稳定性裕量降低，稳定性减弱。
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关键词:
- 铅铋自然循环 /
- 稳定性 /
- 时域法 /
- 快堆瞬态分析程序（FRTAC）
Abstract: In order to analyze the stability of the natural circulation flow of lead-bismuth eutectic (LBE) in the rectangular circuit, and to obtain the factors affecting the natural circulation flow and the law of action, a one-dimensional system program FRTAC is developed by time-domain method to numerically calculate the lead-bismuth natural circulation, and its stability characteristics were determined by analyzing and processing the dynamic time series. The stability domain and stability boundary of the lead-bismuth natural circulation under the relevant operating conditions, the flow stability characteristics of the lead-bismuth natural circulation loop, as well as the influencing factors and laws are obtained. The results show that increasing the length of the heating section of the loop will increase the stability of the system, while increasing the loop diameter and the height difference between the hot and cold cores will decrease the stability margin and weaken the stability of the system. -
图 2 FRTAC程序中主回路离散化
管段1—加热段；管段2, 3—热段；管段4—冷却段；管段5, 6, 7, 9, 10—冷段；管段8—流量计扁管；管段11—阀门
Figure 2. Main Loop Discretization in FRTAC
图 5 Qc和Gc不稳定边界随LS的变化
Figure 5. Variation of Unstable Boundary between Qc and Gc with LS
图 7 Qc和Gc随流道直径的变化
Figure 7. Variation of Qc and Gc under Different Flow Channel Diameters
图 8 不同流道直径下的动态稳定边界
Figure 8. Dynamic Stability Boundary under Different Flow Channel Diameters
表 1 铅铋自然循环回路参数
Table 1. Parameters of LBE Natural Circulation Loop
参数类型 参数值 主回路工质 LBE（铅44.5%，铋55.5%） 循环类型 自然循环 主管道内径/m 42 LS/m 1.5 冷却段长度/m 1.2 冷热段中心距离/m 3.5 总循环长度/m 13.7 回路循环高度/m 5 运行压力/MPa 1.5 
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