中文摘要：

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12×10^4。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。

英文摘要：

The resonator plays a role of wetness sensor in the process of steam wetness measuring based on microwave resonator perturbation. The structure of microwave resonator has a important effect on measurement precision. The resonator＇s style and working mode and working frequency were chosen. The structure of resonator and the coupling structure between resonator and wave-guide were optimized by using ANSOFF HFSS9.0 software. The ellipse hole has the best coupling effect. The optimized structure of the end separator is three-ring grid. It was proved that the resonator has a high quality factor and a good high-frequency character by calculating and testing. The quality factor of the resonator is 12×10^4. The effect of the resonator and its connector on wet steam two-phase flow field were analyzed. The structure of resonator at facing wind end was optimized.