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Research on the Influence of Butterfly Valve on the Onine Calibration Performance of Ultrasonic Flowmeter
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摘要: 为研究校准现场阻流件对超声流量计的干扰，对蝶阀下游超声流量计内部的流场进行大涡模拟，分析蝶阀开度、流量计流向和周向安装位置对声道上速度分布的影响规律。结果表明，蝶阀造成下游管内速度分布发生严重畸变，且随着超声流量计流向安装距离的增大，流态畸变的干扰作用逐渐减弱，修正系数对周向安装角的敏感度也逐渐下降，最大误差由0.12减小至0.04；超声流量计周向安装位置对其声道上速度分布具有显著影响，修正系数随着周向安装角的变化而波动，且距蝶阀越远，修正系数波动值越小，尤其是周向安装角为0°和180°，修正系数误差均小于0.04；管内流态畸变程度随着蝶阀开度的增大而减小，提高了超声流量计声道上速度分布的均匀性。通过研究，获得了蝶阀扰流条件下超声流量计的推荐安装位置，有助于提高在线校准的准确性。Abstract: In order to reduce the interference of flow obstructions on ultrasonic flowmeter online calibration, a large eddy simulation is performed on the flow field in the ultrasonic flowmeter downstream of the butterfly valve. The effects of the opening degree of the butterfly valve, the flow direction, and the circumferential installation position on the velocity distribution on the sound channel are analyzed. The results indicate that the butterfly valve causes severe distortion of the velocity distribution in the downstream pipe. With the increase of the ultrasonic flowmeter flow direction installation distance, the interference effect of the flow pattern distortion gradually weakens. The sensitivity of the correction coefficient to the circumferential installation angle also gradually decreases, and the maximum difference decreases from 0.12 to 0.04. The circumferential installation position of the ultrasonic flowmeter has a significant impact on the velocity distribution on its sound channel, resulting in fluctuations in the correction coefficient with the change of the circumferential installation angle. Furthermore, the farther away from the butterfly valve, the smaller the fluctuation value of the correction coefficient, especially when the circumferential installation angle is 0° and 180°, and the error of the correction coefficient is less than 0.04. The degree of flow pattern distortion in the pipe decreases with the increase of the butterfly valve opening, which improves the uniformity of the velocity distribution on the sound channel of the ultrasonic flowmeter. The recommended installation position of the ultrasonic flowmeter under the condition of butterfly valve disturbance is obtained, which is helpful in improving the accuracy of the online calibration.
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Key words:
- metrology /
- ultrasonic flowmeter /
- butterfly valve /
- online calibration /
- numerical simulation /
- velocity distribution
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图 1 单反射式超声流量计工作原理
Figure 1. Working principle of single reflection ultrasonic flowmeter
图 2 物理模型与超声波流量计声道示意图
Figure 2. Schematic diagram of physical model and ultrasonic flowmeter channel
图 3 弯头下游不同流向位置处的修正系数K
Figure 3. Correction coefficient K at different flow direction positions downstream of elbow
图 4 蝶阀下游管道横截面流向时均速度云图
Figure 4. Velocity cloud map of average velocity in downstream pipe of the butterfly valve in cross-flow direction
图 5 蝶阀下游管道中心上的瞬时速度变化
Figure 5. Instantaneous velocity change on the centerline of downstream pipe of butterfly valve
图 6 不同流向位置处声道上的速度分布
Figure 6. Velocity distribution on the channel at different flow directions
图 7 修正系数K随声道流向位置的变化趋势
Figure 7. The change trend of the correction coefficient K with sound channel flow direction position
图 8 不同周向安装角时声道上时均速度分布
Figure 8. Mean velocity distribution on the channel at different circumferential installation angles
图 9 修正系数K随周向安装角α的变化趋势
Figure 9. Variation trend of correction coefficient K with circumferential installation angle α
图 11 不同流向位置处声道线上的速度分布
Figure 11. Velocity distribution on the channel line at different flow directions
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