蒸汽湿度测量谐振腔的时间响应特性  

Temporal Response Performance on Resonator of Steam Wetness Measurement

作　　者：李恒凡[1] 庞永超[1] 赵豫晋 韩中合[1] 

机构地区：[1]电站设备状态监测与控制教育部重点实验室(华北电力大学),保定071003

出　　处：《汽轮机技术》2017年第2期104-106,110,共4页Turbine Technology

基　　金：华北电力大学中央高校基本科研业务费专项资金(2015MS107)

摘　　要：采用流固耦合法,分析计算了不同马赫数下,谐振腔在整个测量过程中的温度分布,进而分析了温度变化引起的热变形对谐振频率和湿度测量的影响。结果表明:在测量过程中,谐振腔温度发生缓慢且较大的变化,随着马赫数的增加,温升逐渐增大,当Ma=0.5时,温升可达10℃以上,测量与非测量状态之间的温差达到1℃以上,且在两者之间切换时,需等待600s以上,直至腔体温度稳定后,再进行湿度测量;随着马赫数的增加,频率偏差逐渐增大,可达10~5Hz,引起的湿度偏差最大为16%左右。The temperature field of resonant cavity was calculated using coupled fluid-solid analysis under different measuring time and Maeh number, while the influence of cavity thermal deformation on the resonant frequency and measurement of humidity. The results showed that the temperature of resonant cavity changes slowly and largely during the measurement. The temperature is gradually increased with increasing Math number, when Ma is 0.5, the temperature will be up to 10℃. The temperature difference is more than 1℃ between the measurement and non-measurement state and it needs to wait for more than 600s until the temperature is stable when switching the measurement state before measuring the steam wetness. As the Math number increases, the frequency deviation increases gradually up to 103 Hz and the humidity deviation is up to about 16%.

关 键 词：湿度测量 流固耦合 谐振腔 测量过程 热变形 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]