Research on Disturbance Wave Characteristics of Annular Flow on Edge and Corner Rods of Rod Bundle Channel
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摘要: 研究棒束通道中边棒和角棒环状流扰动波特性，可为核电厂稳态运行和应急处置提供理论支撑。本研究建立棒束通道中环状流可视化实验系统，对边棒和角棒表面扰动波特性进行分析。结果表明，扰动波形态可以分成小尺度波、包状扰动波、带状扰动波和带状破碎波4种；液相折算速度保持不变时，平均液膜厚度随气相折算速度增加而变小，当液相折算速度逐渐变大时，平均液膜厚度数值也逐渐变大；扰动波波高随气相折算速度增加而变小，边棒表面扰动波高度低于角棒的值。当液相折算速度低于0.41 m/s时，扰动波波速随着气、液相折算速度增加而变大；当液相折算速度高于0.41 m/s时，扰动波波速高于气相折算速度。扰动波波频随气相折算速度增加而变大，随液相折算速度变化规律不明显，这取决于波动形态的变化。边棒和角棒表面液膜厚度数据的熵均值随着扰动波形态从小尺度波、包状扰动波、带状扰动波到带状破碎波逐步增加，因此可以使用多尺度排列熵分析方法判定棒束通道中扰动波形态。Abstract: The research on disturbance wave characteristics of annular flow on edge and corner rods of rod bundle channel can provide theoretical supports for the steady-state operation and emergency disposal of nuclear power plants. In this study, a visualize experimental system for annular flow in rod bundle channel was set up to analyze the disturbance wave characteristics on edge and corner rod surface. The results show that the disturbance wave behaviors can be divided into the small-scale waves, the bag-shaped waves, the ligament-shaped waves and the ligament-shaped waves with liquid-loss. When the liquid superficial velocity remains constant, the average film thickness decreases with the increase of gas superficial velocity; when the liquid superficial velocity is increasing, the average film thickness is also increasing. The disturbance wave height decreases with the increasing gas superficial velocity, and the disturbance wave height on side rod is lower than that of corner rod. When the liquid superficial velocity is lower than 0.41 m/s, the wave velocity increases with the increasing gas and liquid velocity. The wave velocity is higher than the gas superficial velocity when the liquid velocity is higher than 0.41 m/s. The wave frequency becomes larger with the increasing gas superficial velocity, but the law of change with liquid superficial velocity is not obvious, which depends on the change of wave form. The average entropy value of liquid film thickness of side and corner rods increases with the wave behaviors from small-scale waves, bag-shaped waves, ligament-shaped waves to ligament-shaped waves with liquid-loss, so the wave form in rod bundle channel can be determined by the multiscale permutation entropy analysis method.
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Key words:
- Rod bundle channel /
- Annular flow /
- Disturbance wave /
- Multiscale permutation entropy
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图 1 棒束通道结构和高速摄影仪视场示意图
Figure 1. Schematic Diagram of Rod Bundle Structure and High-speed Camera Field of View
图 3 高速摄影数据处理过程与理论分析
Figure 3. Image Processing of High-speed Camera Data and Theoretical Analysis
图 4 扰动波特征信息提取与建模
波高—扰动波高度；波速—扰动波速度
Figure 4. Feature Information Extraction and Modeling of Disturbance Wave
图 6 边棒与角棒环状流扰动波工况示意图
Figure 6. Schematic Diagram of Annular Disturbance Wave Conditions on Edge and Corner Rods
图 7 平均液膜厚度实验值与经验式预测结果比较
Figure 7. Comparison of Average Liquid Film Thickness (Experimental Data) with Predictions of Various Correlations
图 8 扰动波高度实验值与经验式预测结果比较
Figure 8. Comparison of Disturbance Wave Height (Experimental Data) with Predictions of Various Correlations
图 9 扰动波速度实验值与经验式预测结果比较
Figure 9. Comparison of Disturbance Wave Velocity (Experimental Data) with Predictions of Various Correlations
图 10 扰动波频率实验值与经验式预测结果比较
Figure 10. Comparison of Disturbance Wave Frequency (Experimental Data) with Predictions of Various Correlations
图 11 不同扰动波液膜厚度的多尺度排列熵分析示意图
Figure 11. Multiscale Permutation Entropy Analysis of Liquid Film Thickness for Different Disturbance Waves
表 1 测量参数、仪表信息和总不确定度
Table 1. Measurement Parameters, Instrument Information, and Total Uncertainty
参数 仪表名称 仪表量程 精度等级/% 总不确定度/% 压力 压力传感器 30、50、100 kPa 0.1 0.5~3.26 水流量 质量流量计 6000 kg/h 0.1 0.23~3.12 气流量 转子流量计 50、100、200 m3/h 2 2.37~4.28 流体温度 水银温度计 100℃ 0.2 0.25~1.5 
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