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Title: Study On T Ransducer P Rotrusion E Ffect Of U Ltrasonic F Lowmeter Using Wind Tunnel And Ldv
Author: H. Hu D.Zhu L. Cui C. Wang
Source: Flomeko 2016
Year Published: 2016
Abstract: Transducer protrusion into the flow is one of the most important uncertainty sources of ultrasonic transit - time flowmeter s . It introduces a symmetric error by local ly distorti ng the velocity profile along the acoustic path, and incomplete sampling of velocity along the path that arises from the transducer not being flush mounted in conduit s or channels . Transducer protrusion effect depends on the protrusion ratio and t he shape of the transducer mount . It should be estimated and corrected for flowme ters without being calibrated using flow standard facility. A stretchable model transducer made of plexi - glass is mounted on a flat plate in wind tunnel. Local velocity distri butions are observed along possible acoustic paths using Laser Doppler Velocimetry (LDV) technology. Three different positions of transducer protrusion are tested to analyse mechanism of protrusion effect a nd its correction method. Assuming that the transd ucer protrusion only distorts path velocity profile in a certain distance and velocity profile beyond this distortion distance stays the same, protrusion effect for different path lengths can be estimated using a three - zone (two distort ed velocity zones at both ends and one undistorted zone in the middle) distance - weighted averaging method.

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