Research on Phase Distribution Characteristics of Flow Field downstream the Spacer Grid in 5$ \times $5 Rod Bundle
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摘要: 为获取压水堆燃料组件棒束通道内定位格架下游流场相分布特性，设计并制作了适用于5×5棒束通道原型尺寸的新型丝网探测器，使得测点间距达到1.05 mm。开展了带有定位格架的5×5棒束通道内空气-水两相流的空泡份额测量实验，分析了通道内空泡份额的分布特性，并对定位格架搅混翼所引发气相聚集的相分布特性进行了识别。实验结果表明，由于升力的翻转作用，在低空泡份额环境下气泡聚集在棒近壁区域，而在高空泡份额环境气泡聚集在子通道中心；定位格架搅混翼会导致通道内的气相峰值位置发生一定的迁移，且在棒束通道边壁处也观察到与格架边界搅混翼布置方向相关的气相聚集。所研制的丝网探测器可以用于更多类型的定位格架下游流场空泡份额测量，为定位格架结构优化设计提供参考。Abstract: In order to research the phase distribution characteristics downstream the spacer grid in 5×5 rod bundle, a new type of wire mesh sensor suitable for the prototype size of 5×5 rod bundle was designed and fabricated, and the distance between measuring points was 1.05 mm. The void fraction measurement experiment of air-water two phase flow in the 5×5 rod bundle with spacer grid was carried out. The void fraction distribution characteristics within the channel were analyzed, and the phase distribution characteristics induced by gas-phase accumulation due to spacer grid mixing vanes were identified. The experimental results show that due to the overturning effect of lift, bubbles gather near the rod wall under low void fraction conditions, while bubbles appear in the center of subchannel under high void fraction conditions. The spacer grid mixing vanes cause a certain migration of the gas peak position in the channel, and gas accumulation related to the orientation of boundary mixing vanes is also observed at the side wall of the rod bundle channel. The developed wire mesh sensor can be used to measure the void fraction in the downstream flow field of more types of spacer grids, and provide reference for the structural optimization design of spacer grids.
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Key words:
- 5×5 rod bundle channel /
- Wire mesh sensor /
- Spacer grid /
- Void fraction
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图 4 三层丝网探测器的电极丝分布
红色—接收丝；绿色—上层激励丝；紫色—下层激励丝。
Figure 4. Electrode Wire Distribution of Three-layer Wire Mesh Sensor
图 8 气相表观流速对时均空泡份额的影响分析
x、y—棒束通道内的x轴的坐标与y轴的坐标。
Figure 8. Analysis of the Influence of Air Phase Superficial Velocity on Time-average Void Fraction
图 9 液相表观流速对时均空泡份额的影响分析
Figure 9. Analysis of the Influence of Liquid Phase Superficial Velocity on Time-average Void Fraction
图 11 棒束通道6条中心线时均空泡份额分布特性
Figure 11. Time-average Void Fraction Distribution on the 6 Central Lines in Rod Bundle Channel
图 12 空泡份额峰值偏移现象与对应的搅混翼结构
Figure 12. Air Phase Peak Shifting of Void Fraction and Related Mixing Vane Structure
图 13 棒束通道边壁侧搅混翼横流作用
Figure 13. Cross-flow Caused by Mixing Vane in Side Region of Rod Bundle
图 14 定位格架下游流场边壁处气相聚集区
Figure 14. Air Phase Gathering Position in Downstream Flow Field of Spacer Grid
图 15 格架边壁气相聚集壁面空泡份额分布
圆外围参数代表该数据所在的角度，°；圆内的径向数据为空泡份额。
Figure 15. Distribution of Void Fraction in Side Region of Spacer Grid
表 1 实验工况表
Table 1. Experimental Conditions
工况 液相表观流速（Jl ）/(m·s−1) 气相表观流速（Jg）/(m·s−1) 1 0.583 0.060 2 0.583 0.203 3 0.583 0.456 4 0.583 0.683 5 0.758 0.060 6 0.986 0.060 7 1.128 0.060 8 1.666 0.060 9 0.758 0.456 10 0.758 0.683 
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表 2 三层丝网探测器的结构参数
Table 2. Structure Parameters of Three-layer Wire Mesh Sensor
结构参数 数值 电极丝数量 激励丝 63 接收丝 63 电极丝直径/mm 0.1 激励丝间距/mm 2.1 接收丝间距/mm 1.05 电极丝层间距/mm 2.0 棒间隙处测点数量 3
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表 3 丝网探测器测量得到的通道时均空泡份额
Table 3. The Time-average Void Fraction Measured by Wire Mesh Sensor in Rod Bundle
工况 α 1 0.138 2 0.278 3 0.364 4 0.428 5 0.121 6 0.102 7 0.091 8 0.068 9 0.022 10 0.405
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