Improvement of gas ultrasonic flowmeter measurement non‐linearity based on ray tracing method

Zheng, Dandan; Mei, Jianqiang; Wang, Mi

doi:10.1049/iet-smt.2015.0310

Cited by 22 publications

(17 citation statements)

References 14 publications

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“…The results illustrated that the non-linear propagation characteristics caused large deviations of the acoustic path in different flow velocities, which strongly affected the stability and accuracy of flow measurement. In 2016, the non-linear variation of error caused by increasing flow velocity had been studied by Zheng et al [5]. In our research, ultrasonic wave propagation was simulated at flow velocities 1-50 m/s for both DN100 and DN500 flowmeters.…”

Section: Introductionmentioning

confidence: 85%

Effect mechanism of non‐ideal flow field on acoustic field in gas ultrasonic flowmeter

Zheng

Mao

2019

IET Science, Measurement & Technology

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Gas ultrasonic flowmeters are widely used in natural gas measurement. In order to achieve high accuracy, it is meaningful to study interaction mechanism between flow field and acoustic field. In this study, effects of non-ideal flow on ultrasonic propagation are discussed. Firstly, a flow-acoustic coupling model is established based on COMSOL and its feasibility is verified by experiments. In order to be more in line with actual working condition, flow field is obtained by CFD simulation instead of theoretical formula calculation. Secondly, with this method, two typical non-ideal flows which often exist in real application are mainly analysed, including vortices near transducers and bend flows. The acoustic trajectory offsets, transit time, sound pressure and measurement errors are compared with results of ideal flow field. It is shown that errors will increase 10% caused by vortices near transducers, and increase 13% caused by bend flows. Besides, when passing through vortices near transducers with negative flow, trajectory offsets are opposite to flow direction. Finally, some suggestions for flowmeter design are proposed to improve measurement performance of gas ultrasonic flowmeter.

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Section: Introductionmentioning

confidence: 85%

Effect mechanism of non‐ideal flow field on acoustic field in gas ultrasonic flowmeter

Zheng

Mao

2019

IET Science, Measurement & Technology

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“…For the background flow velocity, two types of profile are chosen, with or without reflux. Firstly, the uniform flow velocity profile (

= constant, hereinafter referred to as the U profile) and the turbulent velocity profile (T profile) [ 20 , 21 ] belong to the “no reflux” velocity profile. Secondly, the velocity profile obtained by CFD simulation considering the protrusion and recess of the transducer (PR profile) belongs to the ‘‘with reflux’’ situation.…”

Section: New Hybrid Scheme and Numerical Realization For The Ultramentioning

confidence: 99%

“…Sound propagation in fluid has also been analyzed by researchers employing the ray acoustics. In 2002 to 2016, the ray tracing method was used by Koechner [ 15 ], Bezdek [ 16 ], Tezuka [ 17 ], Iooss [ 18 ], Kupni [ 19 ], Li [ 20 ], and Zheng [ 21 ] ultrasonic flowmeter studies. It was found that the sound propagation path deviates from the straight line because of the flow profile.…”

Section: Introductionmentioning

confidence: 99%

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New Analysis Scheme of Flow-Acoustic Coupling for Gas Ultrasonic Flowmeter with Vortex near the Transducer

Sun

Zhang

Zheng

2018

Sensors

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Ultrasonic flowmeters with a small or medium diameter are widely used in process industries. The flow field disturbance on acoustic propagation caused by a vortex near the transducer inside the sensor as well as the mechanism and details of flow-acoustic interaction are needed to strengthen research. For that reason, a new hybrid scheme is proposed; the theories of computational fluid dynamics (CFD), wave acoustics, and ray acoustics are used comprehensively by a new step-by-step method. The flow field with a vortex near the transducer, and its influence on sound propagation, receiving, and flowmeter performance are analyzed in depth. It was found that, firstly, the velocity and vortex intensity distribution were asymmetric on the sensor cross-section and acoustic path. Secondly, when passing through the vortex zone, the central ray trajectory was deflected significantly. The sound pressure on the central line of the sound path also changed. Thirdly, the pressure deviation becomes larger with as the flow velocity increases. The deviation was up to 17% for different velocity profiles in a range of 0.6 m/s to 53 m/s. Lastly, in comparison to the theoretical value, the relative deviation of the instrument coefficient for the velocity profile with a vortex near the transducer reached up to −17%. In addition, the rationality of the simulation was proved by experiments.

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“…Compared with the traditional membrane gas meter, the ultrasonic gas flowmeter has the outstanding advantages of noncontact type, small pressure loss, wide range ratio, high accuracy, etc. [8].…”

Section: Introductionmentioning

confidence: 99%

Design of a High Precision Ultrasonic Gas Flowmeter

Chen

Zhang

Wang

et al. 2020

Sensors

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Aiming at the problems of substantial pressure loss, small range ratio and contact measurement in traditional gas flowmeters, this paper designs a new type of data-filtering ultrasonic gas flowmeter. The flowmeter is composed of hardware circuits such as STM32F407 (ARM Cortex 32-bit microcontroller) main control chip and high-precision timing chip TDC-GP22 (time to digital converter). The software uses a new data-filtering algorithm combining Kalman filtering algorithm and arithmetic average algorithm to improve the measurement accuracy of ultrasonic gas flowmeter. Through experimental comparison, we find that the filtering algorithm effectively reduces the measurement error of the system. Within the flow range of 0.025–4 m3/h, the maximum relative error of the system measurement is 2.7404%, which meets the national standard for the measurement error of the 1.5-level instruments. Moreover, it reduces the zero-drift to about one half of the original, which significantly improves the stability of the system. The gas flowmeter has the characteristics of high accuracy, good stability, low power consumption, and the overall performance is significantly improved.

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Improvement of gas ultrasonic flowmeter measurement non‐linearity based on ray tracing method

Cited by 22 publications

References 14 publications

Effect mechanism of non‐ideal flow field on acoustic field in gas ultrasonic flowmeter

Effect mechanism of non‐ideal flow field on acoustic field in gas ultrasonic flowmeter

New Analysis Scheme of Flow-Acoustic Coupling for Gas Ultrasonic Flowmeter with Vortex near the Transducer

Design of a High Precision Ultrasonic Gas Flowmeter

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