摘要
汽轮机变工况运行时,排汽参数将发生变化。研究了微波谐振腔的热膨胀效应,分析了蒸汽温度变化对湿度测量的影响,设计了一种温度自补偿的谐振腔结构。分析表明:由于蒸汽的黏性耗散加热,谐振腔的温度高于主流温度,且流速越高,腔体温度越高,腔体和垫环的温差也越大;在一定温度范围内,通过合理设计谐振腔的温度自补偿结构,腔体的谐振频率基本不随温度变化,使谐振腔传感器用于蒸汽湿度测量可以达到较高的测量精度。
The steam temperature of turbine will change under variable condition. Studied the thermal expansion effect of microwave cavity, analyzed the steam temperature changes affecting wetness measurement, and designed a temperature self-compensation structure of resonant cavity. Analysis showed that, due to the heating of the viscous dissipation of steam, the temperature of cavity is higher than mainstream and higher when flow faster, as well as the temperature difference between the cavity and the support ring is bigger. In definite temperature range, with the ratio- nal design of cavity temperature self-compensation structure, the resonant frequency is almost not change with temperature. Resonator sensor can achieve high accuracy for steam wetness measurement.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第5期888-891,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51076044)
关键词
汽轮机
湿度测量
温度自补偿
微波谐振腔
turbine
wetness measurement
temperature self-compensation
microwave cavity
