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

Zheng, Dandan; Lv, Sheng-Hong; Mao, Yang

doi:10.1049/iet-smt.2018.5133

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…where V 0 is the input voltage excitation, V. In the present study, one cycle of signal excitation is considered, and the input voltage signal waveform is formed by combining the sine wave and rectangular wave, as shown in Figure 2 [18,22]. Te voltage signal amplitude is set to 50 V. In order to observe the transmission process of acoustic waves in the GIS enclosure and reduce the calculation amount of simulation work, the voltage excitation frequency is set to 20 MHz according to the initial pMUT structure size.…”

Section: Governing Equations and Computational Methodsmentioning

confidence: 99%

Numerical Study of Acoustic‐Electric Signal Conversion for GIS Discharge Detection and Structure Optimization for pMUT

Zhao

et al. 2023

Mathematical Problems in Engineering

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With the development of microelectromechanical technology, the piezoelectric micromechanical ultrasonic transducer (pMUT) for ultrasonic detection of gas-insulated switchgear (GIS) breakdown discharge has become possible. In this article, the ultrasonic-solid-pMUT coupling simulation model was established to investigate the propagation process of ultrasonic waves in GIS enclosure and the conversion between ultrasonic and electric signals through pMUT. The output electric signals for the unsimplified top electrode and simplified top electrode model were compared, and the structure of receiving pMUT was optimized according to the main ultrasonic frequency range of GIS breakdown discharge and the key performance parameters of pMUT. First, it is found that the simulation results of the ultrasonic-solid-pMUT coupling model are reliable, and the frequency of the output electric signal of receiving pMUT is consistent with the input signal, while the amplitude of output signal attenuates greatly. Second, simplifying the top electrode of pMUT may lead to relatively large errors in simulation results. The output response of simplified pMUT is obviously weakened, and the inherent frequency is higher. Furthermore, it is noted that the pMUT inherent frequency (f0) is inversely proportional to the radius (R) of the piezoelectric layer and directly proportional to the substrate thickness (dsi). When the coverage rate of the top electrode is between 30% and 80%, the pMUT effective electromechanical coupling coefficient ( K e f f 2 ) is high and has a maximum value. Finally, it is indicated that the pMUT with the optimum structure is suitable for the detection of GIS breakdown discharge ultrasonic signals, and the K e f f 2 can be improved by 106.7%.

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Section: Governing Equations and Computational Methodsmentioning

confidence: 99%

Numerical Study of Acoustic‐Electric Signal Conversion for GIS Discharge Detection and Structure Optimization for pMUT

Zhao

et al. 2023

Mathematical Problems in Engineering

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“…Many coherent vortexes, such as hairpin vortexes and annular vortexes, will appear in the process of laminar flow turbulence conversion, a prominent feature of transition zones. After forming many vortex structures and the random disorder process, laminar flow is gradually transformed into fully developed turbulence [16][17] . Figs.…”

Section: Transition Zonementioning

confidence: 99%

Optimize the Rectifier Structure to Improve the Accuracy of Gas Ultrasonic Flowmeter Under Low Flow Conditions

Yang

Zhang²,

Shi³

et al. 2023

J. Phys.: Conf. Ser.

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With the promotion of the coal-to-gas policy, the consumption of civil natural gas in China is increasing rapidly. Improving the measurement accuracy of the flowmeter is of great significance in reducing transportation costs. Computational fluid dynamics software (FLUENT) was used for simulation, the upstream choke model of a single elbow pipe was established, and the flow field in the urban pipe network’s transition area was analyzed and optimized to improve the existing commercial flow Conditioner. The effects of the Reynolds number, the installation location of the ultrasonic gas flowmeter, and aperture depth on measurement accuracy were investigated. The results show that installing the flow Conditioner can improve the velocity distribution of the flow field in the pipeline. Optimizing the flow Conditioner can shorten the installation position of the flowmeter. The optimum thickness of the flow Conditioner is 0.25D. The research results provide important theoretical significance and application value for improving the industry’s ultrasonic gas flowmeter measurement accuracy.

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“…In the design process of ultrasonic flowmeter, the purpose of flow field analysis and supplementary methods is to improve the measurement accuracy and flow field adaptability of the flowmeter [1] . There are usually two methods.…”

Section: Introductionmentioning

confidence: 99%

Design of Flow Conditioner and Research on Evaluation of Flow Adjustment Effect

Chen¹,

Li²,

Li³

2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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Since ultrasonic flowmeter is sensitive to the flow field. Insufficient development of the flow field such as vortex and asymmetric flow will cause deviations in the measurement results. It has become a common method to accelerate the stabilization of irregular fluids to a fully developed state by a flow conditioner. The flow conditioner is a device installed upstream of the flowmeter to accelerate the stabilization of the irregular flow field, eliminate abnormal flow, and reduce the influence of swirling flow.In practical application, the correlation between flow conditioner and flow meter model has also become an important obstacle restricting the design, compatibility and popularization of flow conditioner. It is an exploratory and meaningful work to design a universal flow conditioner and propose a flow field optimization evaluation method and other basic theories and common key technologies of flow measurement.This paper introduces the self-designed universal flow conditioner, and focuses on the flow adjustment effect evaluation method based on CFD.In order to verify the adjustment effect of the combined flow conditioner, the simulated calculation is carried out and the flow field adjustment effect is compared with that of the plate-type flow conditioner.When the inlet flow rate is 20 m/s, the simulation results show that the combined flow conditioner has excellent performance in eliminating flow field distortion at about 15D downstream the flow conditioner, while the flow velocity distribution in the axial direction can also be optimized to a fully developed symmetrical state.

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

Cited by 9 publications

References 13 publications

Numerical Study of Acoustic‐Electric Signal Conversion for GIS Discharge Detection and Structure Optimization for pMUT

Numerical Study of Acoustic‐Electric Signal Conversion for GIS Discharge Detection and Structure Optimization for pMUT

Optimize the Rectifier Structure to Improve the Accuracy of Gas Ultrasonic Flowmeter Under Low Flow Conditions

Design of Flow Conditioner and Research on Evaluation of Flow Adjustment Effect

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