Feasibility Study on Special-shaped Impedance Void Meter for Measuring Void Fraction in Helical Cruciform Rod Bundle Channel
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摘要: 阻抗空泡仪是测量两相流中截面平均空泡份额的重要手段。然而，由于螺旋十字棒束通道属于高度异化的通道类型，导致阻抗空泡仪电场分布不均匀，从而对空泡份额的测量造成一定困扰。本文基于模拟和实验验证了螺旋十字棒束通道内异形阻抗空泡仪测量空泡份额的可行性。结果表明，在低空泡份额下，接收极无量纲电压随着空泡份额的增加单调增加，这说明异形阻抗空泡仪受螺旋十字结构的影响较小且能够在低空泡份额下被标定；通过理论模型的计算，异形阻抗空泡仪整体上平均绝对百分比误差不超过24%；螺旋节距的变化对空泡份额测量的影响较小，且在不同扭转角截面上，空泡仪电极形状并不影响无量纲电压和空泡份额之间的单调关系，说明了异形阻抗空泡仪测量空泡份额具有可行性。Abstract: Impedance void meter is an important tool for measuring the average void fraction in two-phase flows. However, due to the highly heterogeneous nature of the helical cruciform rod bundle channel, the impedance void meter has uneven electric field distribution, which poses certain challenges to measuring void fraction. This paper verifies the feasibility of using a special-shaped impedance void meter to measure void fraction in a helical cruciform rod bundle channel through simulations and experiments. The results show that at low void fraction, the dimensionless voltage at the receiving electrode increases monotonically with increasing void fraction, indicating that the special-shaped impedance void meter is subject to little influence of helical cruciform structure and can be calibrated at low void fraction. The overall average error of the special-shaped impedance void meter does not exceed 24% according to theoretical model calculations. The magnitude of the helical pitch exerts little influence on the measurement of the void fraction, and the geometry of the electrode within the void meter across various twist angle sections does not alter the monotonic relationship between dimensionless voltage and void fraction. This suggests that utilizing a special-shaped impedance void meter for measuring void fraction is feasible.
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Key words:
- Impedance void meter /
- Special shape /
- Helical cruciform fuel /
- Two-phase flow /
- Void fraction
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图 5 模拟结果与实验结果的对比
Figure 5. Comparison between Simulation Results and Experimental Results
图 7 气泡位置对电场分布的影响
位置1~4指的是放置的球形气泡在流场中的位置。
Figure 7. Influence of Bubble Position on the Distribution of Electric Field
图 9 接收极无量纲电压与气泡直径的关系（位置1）
Figure 9. Relationship between Dimensionless Voltage of Receiving Electrode and Bubble Diameter (Position 1)
图 10 不同结构对接收极无量纲电压的影响（位置1）
Figure 10. Influence of Different Structures on the Dimensionless Voltage of Receiving Electrode (Position 1)
图 11 不同结构中空泡份额实际值与理论值之间的对比
Figure 11. Comparison between the Actual and Theoretical Values of Void Fraction in Different Structures
图 12 空泡份额实际值与理论值之间的对比
Figure 12. Comparison between the Actual and Theoretical Values of Void Fraction
图 14 不同扭转角截面处接收极无量纲电压随空泡份额变化示意图
Figure 14. Dimensionless Voltage Variation at Different Void Fraction along the Twist-angle Cross-section of Receiving Electrode
表 1 扭转角变化范围
Table 1. Variation Range of Twist Angle
结构编号 螺旋节距/mm 电极的扭转角变化范围/(°) 1 300 39.0~51.0 2 500 41.4~48.6 3 1500 43.8~46.2 
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表 2 不同材料的电导率和相对介电常数
Table 2. Electric Conductivity and Relative Permittivity of Different Materials
材料 电导率/（S·m−1） 相对介电常数 聚甲基丙烯酸甲酯 1.0×10−13 3.0 水 0.03 80.0 空气 2.0×10−16 1.0 316不锈钢 1.5×106 5.0
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