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超声波流量计测量流体声速的实验方法
Experimental method of measuring sound velocity using ultrasonic flowmeter
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摘要: 为获取液体介质的声速值,设计了一种测定流体声速的实验方法,该方法利用时差式超声波流量计和标准流量校验设备同时对封闭管道中的液体进行流速测量,分别得到流速的测量值和真实值,从而计算出超声波流量计的仪表系数,并以此导出了一定条件下液体介质的声速值随仪表系数的变化关系式.利用该方法测量给出了0.17MPa下四氧化二氮（N2O4）在7.6—19.4℃、偏二甲肼（（CH3）2NNH2）在6.5—25.2℃范围内的流体声速值,并为其他液体介质的声速测量提供了借鉴.Abstract: In order to obtain sound velocity in liquid,an experimental method of measuring sound velocity is designed.A time-difference type ultrasonic flowmeter and normal flow checkout equipment are used to measure the flow speed of liquid in closed hydraulic pipeline simultaneously,then the measured value and the true value of the flow rate are measured,and the meter-factor of the ultrasonic flowmeter is determined.Furthermore,the relationship between the sound velocity and the meter-factor is derived under a certain condition.Based on the method,the velocity of sound in dinitrogen tetroxide （N2O4） at 7.6—19.4℃ and unsymmetric dimethyl hydrazine （（CH3）2NNH2） at 6.5—25.2℃ are measured at 0.17MPa.It provides reference for measuring the sound velocity in other liquid.
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