热力发电Issue(3)：99-103,5.DOI:10.3969/j.issn.1002-3364.2015.03.099
用于液膜厚度测量的开式同轴腔传感器结构设计
Structural design of microwave coaxial resonant cavity sensor for liquid film thickness measurement
摘要
Abstract
Dragged by high speed steam flow,the water film at wet-steam region in steam turbine low pressure cylin-der will form large droplets,causing serious water erosion of rotor blade.Real-time monitoring on liquid film thick-ness has great significance on rotor blade protection and unit safe operation.Thus,equivalent circuit of resonant cav-ity was built up.On this basis,the mathematical model of water film thickness measurement was established and the thickness measurement equation was deduced.The opening coaxial resonant cavity with good electromagnetic per-formance was designed.By using the HFSS software,the relationship between water film thickness and resonance frequency was analyzed,and the undetermined coefficients of thickness measurement equation were determined. Simulation on distilled water film whose dielectric constant is 81 shows that,when the water film thickness increases from 0 mm to 1 mm (with step of 0.02),the fitting similarity is 0.995 and the mean square error is 0.022.There-fore,this measurement formula has high reliability,which can be used to measure the liquid film thickness for static blades,cylinder walls,guide rings and other places.关键词
汽轮机/液膜厚度/同轴谐振腔传感器/开放式/测量关系式Key words
steam turbine/liquid film thickness/coaxial resonant cavity/sensor/open cavity/measurement correla-tion分类
能源科技引用本文复制引用
钱江波,严晓哲,韩中合..用于液膜厚度测量的开式同轴腔传感器结构设计[J].热力发电,2015,(3):99-103,5.基金项目
国家自然科学基金资助项目（51016044）；中央高校基本科研业务资助项目 （）
