利用一台插入式超声流量计,在不同安装角度和不同流速点条件下,测量充分发展状态下的管道内各区域流速,以分析管道流速分布状况及其中心对称性。实验得出,管道流速从中心向边缘区域递减,高流速状态下基本呈中心对称分布,低流速状态下不具对称性;管道截面上方区域流速略大于下方区域,水平中心线区域流速略大于垂直中心线区域。由此表明,在充分发展状态下管道流速分布不是严格中心对称的,多声道超声流量计在管道上安装角度的变化会在一定程度上引起其计量性能的变化,特别是在低流速状态下。
Abstract
In order to analyze the flow velocity distribution of the pipeline and its center symmetry, a plug-in ultrasonic flowmeter is used to measure the flow velocity of each area in the pipeline under the conditions of different installation angles and different flow velocity points. The experimental results show that the velocity of the pipeline decreases from the center to the edge, which is basically symmetrical distribution in the high velocity state and asymmetrical distribution in the low velocity state; the velocity of the area above the pipeline section is slightly larger than the area below, and the velocity of the horizontal centerline area is slightly larger than the vertical centerline area. It is shown that the velocity distribution of the pipeline is not strictly centrosymmetric under the fully developed condition, the change of the installation angle of the multi-channel ultrasonic flowmeter on the pipeline will cause the change of its measurement performance to a certain extent, especially in the low flow rate state.
关键词
计量学 /
插入式超声流量计 /
管道流速分布 /
中心对称 /
安装角度
Key words
metrology /
plug-in ultrasonic flowmeter /
pipeline velocity distribution /
centrosymmetry /
installation angle
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参考文献
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基金
国家质量基础的共性技术研究与应用专项(2017YFF0206303)
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