蒸汽参数突变对蒸汽湿度测量的影响分析.pdf

, OF ENGINEERING THERMOPHYSICSMay, 2013(()071003):TK31:A: 0253–231X(2013)05–0888–04Analysis of Steam Parameters Mutations A?ectingto Measure Steam WetnessQIAN Jiang-Bo HAN Zhong-He ZHANG Mei-Feng LI Heng-Fan(Key Lab of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University),Ministry of Education, Baoding071003,China)AbstractThe steam temperature of turbine will change under variable condition. Studied thethermal expansion e?ect of microwave cavity, analyzed the steam temperature changes a?ectingwetness measurement, and designed a temperature pensation structure of resonant showed that, due to the heating of the viscous dissipation of steam, the temperature ofcavity is higher than mainstream and higher when ?ow faster, as well as thetemperature di?erencebetween the cavity and the support ring is bigger. In de?nite temperature range, with the ratio-nal design of cavity temperature pensation structure, the resonant frequency is almost notchange with temperature. Resonator sensor can achieve high accuracy for steam wetness wordsturbine; wetness measurement; temperature pensation; microwave cavity05931[1]12%[2?4]K. Baumann19101%1%(Baumann)[5]5000[1][6][7]12012-12-23;2013-04-28()(1978–):88911Fig. 1 The model of cylindrical cavityTE011[8]TE011λ0=2π?()2+(π