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基于谐振腔微扰测量汽轮机排汽湿度,谐振腔起传感器的作用,谐振腔结构对测量的准确性和精确性具有重要影响。根据汽轮机内湿蒸汽特点,分析确定谐振腔类型及其工作模式和基本工作频率。利用ANSOFTHFSS9.0软件,对用于汽轮机排汽湿度测量的微波谐振腔的腔体结构、腔体两端分隔器及谐振腔与波导的耦合结构进行了仿真设计及优化。椭圆孔具有最好的耦合效果,端部采用三圆环网格分隔器结构最优。计算及测试表明,谐振腔具有良好电磁特性,其空腔品质因数可达到12×104。模拟分析了谐振腔及其连接件对湿蒸汽两相流场的影响,优化确定谐振腔迎风端结构。谐振腔入口壁面制成楔形有利于提高测量的精度。
Based on the measurement of cavity perturbation of steam turbine exhaust humidity, the role of the resonator as a resonator, the resonator structure of the measurement accuracy and accuracy have a significant impact. According to the steam turbine steam turbine characteristics, analysis to determine the type of resonant cavity and its working mode and the basic operating frequency. The ANSOFTHFSS 9.0 software is used to simulate the cavity structure of microwave cavity, the splitter at both ends of cavity and the coupling structure between cavity and waveguide in turbine exhaust humidity measurement. Ellipse with the best coupling effect, the end of the three-ring mesh divider structure optimal. Calculations and tests show that the resonator has good electromagnetic characteristics and its cavity quality factor can reach 12 × 104. The influence of resonator and its connection on the two-phase flow field of wet steam is simulated and analyzed, and the structure of the windward side of the resonator is optimized. The wedge shape of the cavity entrance wall helps to improve the measurement accuracy.