基于网丝传感器的燃料组件间两相流测量系统

发布时间：2022-11-12 13:59

　　两相流存在于大多数热工流体环境中,在核电站燃料组件间热力水力工程实验中的气液两相流测量有重要意义。网丝传感器在采集分辨率和采集速度上比电阻式,超声波式传感器更有优势。压水堆燃料组件热工水力实验中的气液两相流的测量有对于研究特定工况下棒间流动特性、包壳传热特性均有重要意义。传统的两相流测量手段应用于燃料组件棒间空泡份额和气泡速度分布测量时,存在测量空间分辨率不够,或测量成本过高的局限性。针对上述问题,论文开展了适合燃料组件两相流测量的网丝传感器的研制,包括激励电路和接收电路设计、数据采集程序和图像重构程序、燃料组件模拟实验段设计等。与传统的网丝传感器不同的是,该设计同时将燃料棒本体作为激励电极,进一步提高了测量的空间分辨率。为了测试和验证所设计的网丝传感器,设计并制造了模拟燃料组件实验台架。通过安装了棒束的矩形实验段中产生上升气泡,模拟燃料组件间的两相流环境。在本课题中,电路设计是最重要的部分。电路设计得到改进。设计的电路在功率、成本和复杂度方面进行了优化。该控制是使用微控制器执行的,没有使用任何移位寄存器或多路复用器。电路简单,响应时间快,噪声低。 

【文章页数】：93 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
Introduction
    1.1 Nuclear science and nuclear energy
    1.2 Commonly used Nuclear Reactors
        1.2.1 Pressurized Boiling Water Nuclear Reactors(PWRs)
        1.2.2 Boiling water Reactor
        1.2.3 Pressurized Heavy Water Reactor
    1.3 Void fraction & two-phase flow
        1.3.1 Phase fraction
    1.4 Types of two-phase flow
    1.5 Wire-Mesh Sensor
    1.6 Other void fraction measurement techniques
        1.6.1 Tomographic multiphase flow imaging
    1.7 Significance and motivation of research
    1.8 Research objectives
Test Facility Design
    1.9 Acrylic pipe designing
    1.10 Test facility base
    1.11 Acrylic pipe parts
    1.12 Air injection design
    1.13 Test facility
Wire-Mesh Sensor Design
    1.14 Performance requirements
    1.15 Wire mesh sensor working flow
    1.16 Excitation circuit
        1.16.1 STM32F103RC micro-controller
        1.16.2 Voltage follower AD8651AR
    1.17 Receiver Circuit
        1.17.1 AD8007 Trans-impedance Amplifier
    1.18 Measurement principal of WMS circuit
Programming and PCB Design
    1.19 Micro-Controller Programming
        1.19.1 Configuration of GPIOs
        1.19.2 Configuration of Timer
    1.20 PCB Designing
        1.20.1 Voltage follower circuit
        1.20.2 Transmitter circuit
        1.20.3 Receiver circuit
Testing
    1.21 Connection of test facility with control system
    1.22 Testing
        1.22.1 Micro-controller program testing
        1.22.2 Transmitter PCB testing
        1.22.3 Receiver PCB testing
        1.22.4 Air injection system testing
        1.22.5 Overall system testing
    1.23 Calibration method
Data acquisition and results
    1.24 Data acquisition selection system
    1.25 Lab view-graphical programming syntax
    1.26 Results
        1.26.1 Signal sequence for transmitters
        1.26.2 Four transmitter signals connected
        1.26.3 Thirteen transmitter signals connected
Conclusion and Future Works
    1.27 Conclusion
    1.28 Future works
References
Appendix
    1. STM32F103RC code for signal generation
Publications
Acknowledgements



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