Evaluation method of transit time difference for clamp-on ultrasonic flowmeters in two-phase flows

Murakawa, Hideki; Ichimura, Shuhei; Sugimoto, Katsuhisa; Asano, Hitoshi; Umezawa, Shuichi; Sugita, Katsuhiko

doi:10.1016/j.expthermflusci.2019.109957

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…In contrast, the outer clamp-type ultrasonic flowmeter does not need to destroy the pipeline. In addition, the sensor is detachable, convenient and quick to use, and has a wide range of applications, but the accuracy needs to be further improved [ 19 ]. The key to improving the measurement accuracy of the ultrasonic flowmeter is the accurate measurement of TOF.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of an Ultrasonic Flowmeter Based on the Cross-Correlation Method

Rui

Wang

Sun

et al. 2022

Sensors

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Ultrasonic flowmeters play an important role in industrial production, aerospace and other fields. In this paper, a high-precision ultrasonic flowmeter based on the cross-correlation method is designed, and the commercial finite element software COMSOL Multiphysics 5.6 is used to simulate the propagation process of ultrasonic waves during flow measurement, and the implementation process of the cross-correlation algorithm is simulated by Python language. The flowmeter adopts the cross-correlation algorithm to improve the measurement accuracy of ultrasonic time of flight and adopts the method of combining FPGA and an embedded microprocessor to improve operation efficiency. In order to verify the performance of the flowmeter, we tested the flowmeter on the National Institute of Metrology and the self-built test platform, using the still water dragging method, the dynamic volume method and the field comparison method, respectively. The results show that the flowmeter has the ability to test the flow under the condition of high flow velocity (26 m/s) and a pipe diameter in the range of DN6~DN1600, that the absolute value of the relative indication error does not exceed 0.815% and that the repeatability does not exceed 0.150%. The designed ultrasonic flowmeter has high measurement accuracy, good repeatability, strong stability and a wide application range.

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Section: Introductionmentioning

confidence: 99%

Design and Implementation of an Ultrasonic Flowmeter Based on the Cross-Correlation Method

Rui

Wang

Sun

et al. 2022

Sensors

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“…5,6 For example, a new signal processing method was proposed to determine the transit time difference, particularly at lower signal-to-noise ratios, and to improve the accuracy of transit time difference estimations using clamp-on time-of-flight ultrasonic flow meters for wet stream flows. 7 A method of modeling the received ultrasonic signal using variable frequency analysis was also proposed and validated for an ultrasonic gas flow meter. In this method, the traditional exponential model was modified to include a time-variant frequency parameter, whose value can be estimated based on the sampled signal using the Teager energy operator.…”

Section: Introductionmentioning

confidence: 99%

Study on flow field and measurement characteristics of a small-bore ultrasonic gas flow meter

Chen

Cao

Cui

2021

Measurement and Control

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A new structure is proposed for a DN25-type ultrasonic gas flow meter with a V-shape double sound channel arrangement. The flow field characteristics are analyzed including velocity curves for the four channel lines, velocity profiles for different cross-sections of the flow meter, and streamlines of the transducer channel sections. The metering characteristics of the flowmeter are measured using a Venturi nozzle device. When the pipeline flow rate is less than 2.26 m/s, the pipe installation does not have a significant effect on the velocity profile and the velocity in the channel lines. However, the error in the low-flow region is large, and the flow distortion directly affects the measurement accuracy. When an ultrasonic gas flow meter with an accuracy class of 1.5 is used with pipes containing a single or double bend upstream, the linear error doubles, low-flow error becomes a negative deviation, and reference error in the low-flow region becomes approximately 700%–949%. The installation structure of the first pair of transducers also affects the signal propagation of the transducers behind it. Therefore, it is critical to process the ultrasonic signal according to the flow field distribution and adopt different weighted algorithms to obtain accurate pipeline flow rates to improve the measurement accuracy of the ultrasonic flow meter.

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“…Moreover, these devices incur lower maintenance costs, are easy to install, and do not affect the flow rate [4]. Thus far, non-invasive flow measurements using ultrasonic waves and acceleration signals have been developed [5][6][7][8][9][10][11]. By considering the velocity profiles across a water pipeline, the flow rate using hybrid ultrasonic flow meter was calculated [5].…”

Section: Introductionmentioning

confidence: 99%

“…To validate the accuracy of the ultrasonic flow meter, the evaluation methods of the flow rate in gas pipeline were simulated by using numerical models based on using computational fluid dynamics [6]. In another study, the velocity under two-phase flow was measured using ultrasonic signals, the corresponding flow was visualized [7,8]. The wavenumbers of the fluid conveying pipe by using the differences of acceleration, microphone signals, and added mass were estimated to predict its flow velocity [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Flow Velocity from the Flexural Vibration of a Fluid-Conveying Pipe Using the Transfer Function Method

Yang

2021

Applied Sciences

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This study presents a method to predict the flow velocity in a fluid-conveying pipe using vibration signals from the pipe surface. The flexural vibration of a fluid pipe is investigated through wave propagation. The wavenumbers and mode shapes of the pipe are determined based on its mechanical properties and flow velocities. The transient components of wavenumbers at low frequencies vary and converge on all values at higher frequencies as the flow velocity is increased. While the stationary fluid pipe exhibits symmetrical mode shapes, pipes with increasing flow velocities exhibit an asymmetric mode shape distribution skewed on one side of the axis. The resonant frequencies shift to the low frequency side as the flow velocity increases. The analytical results of the vibration analysis are used in the transfer function method to predict the flow velocities. To validate the accuracy of the prediction method, numerical vibration signals simulated by the finite element model are used. The actual input flow velocity is compared with the numerical results regarding the same to gauge the accuracy of the prediction method. This method can be used to monitor the flow rate without using flow meters, and thus protect pipelines from sudden malfunction.

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Evaluation method of transit time difference for clamp-on ultrasonic flowmeters in two-phase flows

Cited by 17 publications

References 22 publications

Design and Implementation of an Ultrasonic Flowmeter Based on the Cross-Correlation Method

Design and Implementation of an Ultrasonic Flowmeter Based on the Cross-Correlation Method

Study on flow field and measurement characteristics of a small-bore ultrasonic gas flow meter

Prediction of Flow Velocity from the Flexural Vibration of a Fluid-Conveying Pipe Using the Transfer Function Method

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