基于丝网传感器的两相流相场与浓度场同步测量方法  

Synchronous Measurement Method of Two-phase Flow Phase Field and Concentration Field Based on Wire-mesh Sensor

作　　者：夏馨语 闫旭 傅俊森 肖瑶[1,2,3] 顾汉洋[2,3] XIA Xinyu;YAN Xu;FU Junsen;XIAO Yao;GU Hanyang(College of Smart Energy,Shanghai Jiao Tong University,Shanghai 200240,China;Key Laboratory of Nuclear Power Systems and Equipment,Ministry of Education,Shanghai 200240,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学智慧能源创新学院,上海200240 [2]核动力系统与装备教育部重点实验室,上海200240 [3]上海交通大学机械与动力工程学院,上海200240

出　　处：《原子能科学技术》2025年第2期383-393,共11页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12322510,12075150,12275174);上海市青年科技启明星计划(22QA1404500)。

摘　　要：准确认识核反应堆燃料组件内交混行为对其优化设计与安全分析极为关键。丝网传感器可对流道截面进行高时空分辨率相分布成像,结合示踪剂质量平衡法已可实现燃料组件单相交混精细测量。但因缺乏两相下浓度场后处理算法,尚无法应用于两相交混研究。本文考虑到相同空泡份额下液相电导率对丝网敏感体的影响特性,提出了一种两相浓度反演算法,实现了两相流动空泡份额场、液相浓度场同步测量。基于电势场数值模拟与实验确认了算法的正确性与精确度。结果显示算法可适用于各类复杂的两相流工况,典型工况下两相浓度反演算法获得的浓度分布平均相对偏差为3.6%。基于本文实验结果表明,该算法计算获得的浓度矩阵平均相对偏差小于3%,进一步验证了同步测量方法的良好的适用性与精确度。It is crucial to understand the internal mixing behavior accurately of the fuel assemblies in the nuclear reactor which could optimize design and safety analysis.The wire-mesh sensor can measure the flow channel cross-section with high spatial and temporal resolutions.At present,the fine measurement of single-phase mixing based on the wire-mesh sensor combined with the mass balance method has been relatively mature,but it lacks the method of measuring concentration field in the twophase intersection mixing.Therefore,a two-phase concentration inversion algorithm was proposed in this paper,which could realize the synchronous measurement of the void fraction field and the liquid phase concentration field in the complex flow field.In order to verify the feasibility and accuracy of this algorithm,numerical simulation and experiments were carried out.In calculating the porosity,Maxwell equation was used.COMSOL multiphysics was applied to simulate the gas-liquid two-phase flow field,including simulating the flow field with different concentrations of single bubble and multi-bubble,and adjusting the concentration distribution by changing the conductivity parameters.The simulation method of the wire-mesh sensor was to set two layers of wires as the receiving and emitter of the sensor.The potential of the excited transmitting line was set to 1 V in turn,and the potential of the unexcited transmitting line and the receiving electrode line was set to 0 V respectively.By simulating the single bubble fluid domain,the two-phase concentration inversion algorithm was finally obtained by comparing the candidate algorithms,and the variable concentration field was established in the multibubble simulation domain.The simulation results show that the algorithm is suitable for the two-phase mixing precision measurement and has high accuracy.In this paper,the method was verified by the experiment of square tube channel synchronous measurement at normal temperature and pressure.Based on 8×8 wire-mesh sensors,void fraction and concentrat

关 键 词：丝网传感器 空泡份额场 液相浓度场 同步测量 两相浓度反演算法 

分 类 号：TL334[核科学技术—核技术及应用]