中国电机工程学报2012，Vol.32Issue(26)：79-85,7.
谐振腔微扰技术测量湿蒸汽两相流的理论分析
Theoretical Analysis of Cavity Perturbation Techniques for Measuring Wet Steam Tow-phase Flow
摘要
Abstract
The accurate measurement of wet steam humidity is important to safe, economic operation and optimization design for turbine. According to the dielectric properties of wet steam mixture, using microwave cavity dielectric perturbation theory, a relationship of cylindrical cavity for humidity measurement in TE011 mode was established. Thermal properties of wet steam, temperature (pressure), resonance frequency and relative frequency offset of the cavity affect the humidity measurement. Humidity measurement increases with temperature (pressure) decreasing, cavity resonant frequency and relative frequency offset increasing, otherwise decreases. The humidity measurement accuracy increases with resonance frequency decreasing and temperature increasing. It suggests that the cavity resonance frequency is between 5-10 GHz for steam humidity measurements. The experiment for measuring exhaust humidity in a 200 MW steam turbine was carried out. The humidity measurement results agree well with the theoretical calculation results. The correctness of the microwave cavity perturbation theory for measuring wet steam humidity was verified.关键词
湿蒸汽/微波谐振腔/微扰理论/TE011模式/湿度测量/汽轮机Key words
wet steam/ microwave cavity/ perturbation theory/ TE011 mode/ humidity measurement/ turbine分类
信息技术与安全科学引用本文复制引用
钱江波,韩中合..谐振腔微扰技术测量湿蒸汽两相流的理论分析[J].中国电机工程学报,2012,32(26):79-85,7.基金项目
国家自然科学基金项目(50676031,51076044) （50676031,51076044）
中央高校基本科研业务费项目(09MG35). （09MG35）
