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Sensors 2018, 18(4), 1151; https://doi.org/10.3390/s18041151

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

School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
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Received: 27 February 2018 / Revised: 31 March 2018 / Accepted: 5 April 2018 / Published: 10 April 2018
(This article belongs to the Special Issue Ultrasonic Sensors 2018)
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Abstract

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. View Full-Text
Keywords: gas ultrasonic flowmeter; transducer; acoustic beam; velocity profile; ray tracing; wave acoustics; computational fluid dynamics gas ultrasonic flowmeter; transducer; acoustic beam; velocity profile; ray tracing; wave acoustics; computational fluid dynamics
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Sun, Y.; Zhang, T.; Zheng, D. New Analysis Scheme of Flow-Acoustic Coupling for Gas Ultrasonic Flowmeter with Vortex near the Transducer. Sensors 2018, 18, 1151.

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