Development of Dynamic Response Characteristics Calibration Device for Liquid Flowmeter

Yongsheng Zhang, Yanjun Liu

Abstract

In order to study the dynamic response characteristics of liquid flowmeter, a dynamic flow device based on superposition principle is established. The device generates the main flow through the screw pump; The positive step or negative step flow component is generated by opening or closing the high-speed solenoid valve; and the Sinusoidal pulsating flow component is formed by the sinusoidal mechanism. The real step flow or pulsating flow can be formed by superimposing the step flow component or pulsating flow component on the main flow. The system is equipped with a weighing system to measure the average flow. The test shows that the step flow component can change from 4 L/min to 20 L/min, and the uncertainty of step amplitude is 5 % (k = 2); The frequency of pulsating flow can change from 5 Hz to 50 Hz, the amplitude can change from 5 L/min to 20 L/min, and the uncertainty of instantaneous flow is 0.5 % (k = 2). The device can be used to calibrate and evaluate the time constant, frequency response characteristics and mean flow error of flowmeter, and is expected to improve the accuracy of unsteady flow measurement.

Keywords

Dynamic Response Characteristics; Unsteady flow; Step flow; Pulsating flow

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IMEKO-TC9-2019-155.pdf

DOI

10.21014/tc9-2022.155

IMEKO TC

TC9 - Flow Measurement

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