Research on Simulation Approach of Inter-wrapper Flow in Liquid Metal Cooled Fast Reactor Based on Subchannel Method
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摘要: 为探究液态金属堆盒内-盒间冷却剂共轭传热效应，运用子通道思想为盒间特殊结构提供新的模拟手段。基于稳定高效的压力耦合方程组的半隐式方法（SIMPLE算法）求解盒间子通道模型，解决了经典子通道算法在面对低流量、倒流和回流现象上难以收敛的问题。以3组件钠工质实验（CCTL-CFR）为对象，通过组件盒内、盒间冷却剂以及壁面温度的对比，验证了盒间子通道模拟方法的可靠性。针对典型液态金属堆，开展全堆芯热工分析，发现盒间流在展平堆芯径向温度分布、降低温度峰值等方面起重要作用，证明了堆芯热工分析考虑盒间流的必要性。本研究成果为液态金属堆堆芯热工及安全分析提供了可行的分析方法。Abstract: In order to explore the conjugate heat transfer effect of the coolant between the assmblies and inter-wrapper channels, the subchannel method is applied to provide a new simulation approach for the inter-wrapper flow (IWF). The subchannel model of IWF is solved based on the stable and efficient SIMPLE algorithm to address the issue that the classical subchannel algorithm is difficult to converge in the face of low flow, reverse flow and backflow phenomena. Through the 3-subassembly test using sodium working fluid (CCTL-CFR), the reliability of the subchannel simulation method for IWF is demonstrated by comparing the temperatures of the coolant and wall. Taking the typical liquid metal cooled fast reactor as the object, the thermal-hydraulic analysis of the full core is conducted. It is found that IWF can greatly flatten the radial temperature distribution of the core and reduce the temperature peak value, which proves the necessity of considering the effect of IWF in thermal-hydraulic analysis. This study provides a feasible analysis method for the thermal and safety analysis of liquid metal cooled fast reactors.
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图 1 盒间子通道划分示意图
Figure 1. Schematic Diagram of Subchannel Division of Inter-wrapper Channels
图 4 堆芯纵剖面冷却剂温度分布和盒间流速度分布
Figure 4. Coolant Temperature Distribution and IWF Velocity Distribution of Vertical Section of Reactor Core
图 5 不同类型组件轴向温度的分布
Figure 5. Axial Temperature Distribution of Different Type of Assemblies
表 1 CCTL-CFR实验参数
Table 1. Parameters for CCTL-CFR Test
输入参数 CCTL-CFR组件 燃料区组件 转换区组件 加热棒直径/mm 16.0 25.0 加热棒栅距/mm 17.4 30.2 绕丝直径/mm 1.4 5.2 绕丝螺距/mm 200.0 700.0 组件对边距/mm 140.0 组件壁厚/mm 15.0 加热段长度/mm 1700.0 轴向功率分布 均匀分布 
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表 2 CCTL-CFR实验工况
工况编号 单组件加热功率/kW 单组件流量/（L·min−1） 进口温度/℃ 61棒 19棒 61棒 19棒 冷却通道 61棒 19棒 冷却通道 工况1 14.5 6.9 10.3 13.1 0.9 251.2 252.1 246.9 工况2 14.5 33.5 10.3 13.1 1.0 251.3 252.1 247.2
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