当管道内流体处于不同雷诺数测量条件时,超声水表的线平均流速vL与面平均流速vS之间存在着显著的非线性。根据管道内被测流体介质流动分布状态不同,提出了一种分段流量测量特性校正新方法,在其临界处设立校正分界点,当层流时,采用常系数校正;湍流与过渡流时,分别采用拟合直线方程校正。经实验验证,该方法是可行的。
Abstract
As the fluid in pipe is in different Reynolds number, the average fluid velocity along the acoustic path measured by the ultrasonic water meter and the mean axial fluid velocity has significant nonlinear. Accorded to the different distribution state of measured fluid flow in the pipe, a new segmented correction method of flow measurement characteristics is proposed. By establishing a cutting point in critical area, the correction method of constant coefficient is adopted at the laminar, and that of linear equation fitting is used at the turbulence and transition flow respectively. Experiments show that this method is feasible.
关键词
计量学 /
超声水表 /
测量特性校正方法 /
传播时间差法 /
雷诺数
Key words
Metrology /
Ultrasonic water meter /
Correction method of measurement characteristic; /
Transmit-time difference method; /
Reynolds
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基金
浙江省优先主题重点工业项目（2010C11025）;浙江省教育厅重大攻关项目（ZD2009012）;浙江省新苗人才计划(2011R405056);宁波市重大科研攻关项目（2009B10003）
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