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Research on Flow Diagnosis of Multipath Ultrasonic Flowmeter

机译:多径超声波流量计的流量诊断研究

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摘要

In the application of ultrasonic flowmeter, flow measurement has a low accuracy, since the length of straight pipe near the ultrasonic sensor is insufficient, especially the presence of the upstream disturbance. In this paper, in order to analyze the inherent relationship between the measurement error and the characteristics of flow field, two flow diagnostic criterions are proposed: asymmetry index (AR1, AR2) and cross flow (cf) indicator. Then the threshold range of the indexes is predicted by computational fluid dynamics numerical simulation in three non-ideal installations (single elbow, single elbow & rectifier, single elbow & 5 pipe diameter & rectifier). Finally, this diagnostic criterion is put forward to distinguish the three operating conditions, and verified by flow experiments. When AR1>0.019 or AR2 > 0.037 and cf > 0.005, the asymmetry and cross flow in the flow field cannot be ignored. At this time, flow measurement accuracy is greater than 1%. It is indicated that disturbance affect measurement accuracy. On the contrary, when diagnostic indexes are less than the threshold values, measurement accuracy can be guaranteed within 1%, which shows that disturbance have little impact on flow measurement.
机译:在超声波流量计的应用中,流量测量具有低精度,因为超声波传感器附近的直管长度不足,尤其是上游干扰的存在。在本文中,为了分析测量误差与流场特征之间的固有关系,提出了两个流诊断标准:不对称指数(AR1,AR2)和交叉流(CF)指示符。然后通过三个非理想装置(单肘,单弯头和整流器,单弯和5管直径和整流器)计算索引的阈值范围。通过计算流体动力学数值模拟预测。最后,提出了这种诊断标准以区分三种操作条件,并通过流动实验验证。当AR1> 0.019或AR2> 0.037和CF> 0.005时,流场中的不对称性和交叉流量不能忽略。此时,流量测量精度大于1%。表示干扰影响测量精度。相反,当诊断索引小于阈值时,可以在1%内保证测量精度,这表明干扰对流量测量几乎没有影响。

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