摘要
本文针对外夹式超声流量计单声道测量原理进行分析,以声波在流动介质中传播的时间差与流速的关系以及折射定律为原理,得出流量Qv与探头安装距离L的数学模型;通过测算,验证了安装距离L数学表达式的正确性;最后通过管道实验,流量随着设定管壁厚度δ的增大而减小,且在不同流量下,相对示值误差的变化趋势一致;根据实验数据,进行相对示值误差E相对于管壁厚度δ的3阶多项式曲线拟合,得出R^2都趋近于1,说明了实验数据具有一定的参考价值。
In this paper, the principle of single track measurement of an external clip type ultrasonic flow meter was analyzed. Based on the relation between the time difference of sound wave propagation in the medium and the flow velocity, and the refraction law, The mathematical model of flow and probe installation distance L was obtained . The correctness of the mathematical expression of installation distanee L was verified through calcukition. At last, the fiow decreases with the increase of the designated wall thickness 8, and the trend of relative error is the same at different flow rates by pipe test. According to the experimental data, The 3rd-order polynomial curve fitting of the relative display error E relative to the wall thickness 8 is used, obtain that R2 was close to 1 , indicating that the ex-perimental data had a certain reference value.
作者
王鹏
刘敦利
许德福
王涛
Wang Peng;Liu Dunli;Xu Defu;Wang Tao
出处
《计量与测试技术》
2019年第3期22-26,共5页
Metrology & Measurement Technique
关键词
超声流量计
探头
理论分析
实验研究
相对示值误差
ultrasonic flow meter
the probe
theoretical analysis
experimental research
relative indication error
