Numerical Simulation of Reverse Flow in Inverted U-tube Steam Generator under Low Flow Single-phase Condition
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摘要: 针对倒U型管蒸汽发生器（UTSG）中的单相倒流现象实验结果，采用三维计算流体力学（CFD）数值模拟的方法对实验段的一次侧和二次侧进行等比例建模，选取Realizable k-ε模型进行湍流计算，完成了网格独立性验证。将数值模拟结果与实验数据进行对比发现计算值与实验值吻合良好。同时对热工参数的影响进行研究，研究结果表明：临界流速随UTSG一次侧入口温度的升高以及二次侧温度的降低而增大；一次侧操作压力对临界流速的影响很小。
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关键词:
- 倒U型管蒸汽发生器（UTSG） /
- 单相 /
- 倒流 /
- 数值模拟
Abstract: Based on the experimental results of single-phase reverse flow in an inverted U-tube steam generator (UTSG), the primary and secondary sides of the experimental section are modeled proportionally by the method of 3D computational fluid dynamics (CFD). The Realizable k-ε model is selected for turbulence calculation, and the grid independence is verified. By comparing the numerical simulation results with the experimental data, it is found that the calculated values are in good agreement with the experimental values. At the same time, it is found that the critical velocity increases with the increase of the primary side inlet temperature and the decrease of the secondary side temperature; The operating pressure at the primary side has little effect on the critical flow rate. -
图 4 沿程温度监测点示意图
Figure 4. Schematic Diagram of Locations of Temperature Monitoring along U-tube
图 6 CFC工况最长管的压降-流速验证
Figure 6. Verification of Pressure Drop-Flow Rate of the Longest Tube under CFC condition
图 7 热态条件最外侧长U型管出口温度验证
Figure 7. Verification of the Outlet Temperature of the Outermost Long U-tube under Hot Condition
图 8 UTSG倒流临界流速与实验结果验证
Figure 8. Critical Velocity of UTSG Reverse Flow and Verification of Experimental Results
图 9 UTSG临界流速随一次侧入口温度变化关系图
Figure 9. Relationship of UTSG Critical Velocity with Temperature Changes of Primary Side Inlet
图 10 UTSG临界流速随二次侧温度变化关系图
Figure 10. Relationship of UTSG Critical Velocity with Temperature Changes of Secondary Side
图 11 不同操作压力下进出口压降随一次侧入口流速变化图
Figure 11. Change of Inlet and Outlet Pressure Drop with Primary Side Flow Rate under Different Operating Pressures
表 1 验证结果对应的实验典型工况表
Table 1. Typical Test Conditions Corresponding to the Verification Results
操作压
力/MPa回路阻
力系数（Kv）一次侧入口
温度T1/℃二次侧冷却
剂流量/(t·h−1）1 766.81 120 37 766.81 150 37 766.81 150 17 
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表 2 CFD计算工况表
Table 2. Working Condition Table of CFD Calculation
热工参数 T1/K 二次侧温度T2/K 操作压力P0 一次侧入口温度 T1+20 T2 Po T1+40 T2 Po T1+60 T2 Po 二次侧温度 T1 T2 Po T1 T2+20 Po T1 T2+40 Po T1 T2+60 Po 一次侧操作压力 T1 T2 Po T1 T2 5 Po T1 T2 15 Po
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