差动氧化钨流动电势调控机理与气液两相流液相流速分布测量研究

气液两相流液相流速分布是核燃料棒冷却状态预测、废水生物降解曝气控制等众多领域的关键测量参数，但目前的实时测量方法只能间接得到平均流速，无法精准预测气液两相流过程，给系统安全可靠运行留下隐患。本项目提出基于差动氧化钨流动电势的气液两相流单点液体流速测量新方法，通过开展气液两相流液体流速测量实验，分析不同流型对差动氧化钨流动电势的影响规律，形成气液两相流液体流速测量模型；分析氧化钨片的表面形貌和物质组成对测量模型的影响规律，探究氧化钨片制备过程中表面动态反射光谱与表面形貌、物质组成的关系，揭示差动氧化钨流动电势的调控机理，优化氧化钨片制备方法，提高测量灵敏度和精度；布放差动氧化钨传感阵列于流道多个截面，验证气液两相流液相流速分布测量稳定性，优化测量模型以减小各类因素对稳定性的影响。本项目的完成将突破气液两相流液相流速分布实时、可靠测量的难题，为气液两相流过程的精准预测、设计和控制奠定基础。

Liquid phase velocity distribution of gas-liquid two-phase flow is a key measurement parameter in many fields, such as prediction of cooling state of nuclear fuel rods, control of wastewater biodegradable aeration etc. However, the current real-time measurement methods can only obtain the average flow rate indirectly. The gas-liquid two-phase flow process cannot be predicted accurately, leaving hidden dangers for safe and reliable operation of the system. In this project, a new method for measuring single point liquid velocity of gas-liquid two-phase flow based on the streaming potential of differential tungsten oxide is proposed. The influence law of different flow patterns on the streaming potential of differential tungsten oxide is analyzed by carrying out the liquid velocity measurement experiment of gas-liquid two-phase flow. So the liquid velocity measurement model of gas-liquid two-phase flow is obtained. Furthermore, the influence law of surface morphology and material composition of tungsten oxide sheet on the measurement model is analyzed. The relationship between surface dynamic reflection spectrum during the preparation of tungsten oxide sheet and surface morphology and material composition is investigated. The regulation mechanism of differential tungsten oxide streaming potential is revealed. Therefore, the preparation method of tungsten oxide sheet is optimized, and the measurement sensitivity and accuracy are improved. At last, the differential tungsten oxide sensor arrays are placed in multiple sections of the flow channel to verify the measurement stability of liquid phase velocity distribution of gas-liquid two-phase flow. The measurement model is optimized to reduce the influence of various factors on stability. The successful implementation of this project will break through the problem of real-time and reliable measurement of liquid phase velocity distribution of gas-liquid two-phase flow, and lay a foundation for the accurate prediction, design and control of gas-liquid two-phase flow process.