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Bending pipe error analysis and correction of ultrasonic flowmeter

Published:2015-04-07 author:WU Chun-hua，BAO Min Browse: 2798 Check PDF documents

Bending pipe error analysis and correction of ultrasonic flowmeter

WU Chun-hua，BAO Min

（Faculty of Mechanical Engineering & Automation，Zhejiang Sci-tech University，Hangzhou 310018，China）

Abstract：Aiming at the bending pipe error of ultrasonic flowmeter proble，numerical simulation was carried out to study the secondary

flow vertical error and horizontal error. The formula of secondary flow was derived from the secondary flow line. The simulation was run in

different Reynolds number，Reynolds number ranged from 3 000 to 50 000. Ultrasonic flowmeters were installed at 5D，10D and 20D

distance to bending pipe downstream. A method was proposed that the pressure difference between the top of and the bottom of bending

pipe outlet could be used to present the secondary flow intensity. Through the pressure difference the bending pipe error could be

corrected. The results indicate that when Reynolds number is larger than 29 000，error at 10D exceed error at 5D. The maximum value of

the secondary flow vertical error and the secondary horizontal error are about 1.2%and 0.7%respectively，correction method is proved to

be right.

Key words：ultrasonic flowmeter；elbow error；pressure difference

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