Pomiary strumieni przepływów dwufazowych metodami ultradźwiękowymi za kolanem rurociągu

Synowiec, P.; Wędrychowicz, W.; Andruszkiewicz, A.

doi:10.15199/13.2016.9.27

Cited by 1 publication

(2 citation statements)

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“…To make the non-invasive LDA measurement possible measurement sections of the pipeline were made of organic glass and surrounded with a correction vessel for the time of measurements to eliminate the effect of refraction of laser light on the curvilinear surface. The results obtained from the LDA measurements in the form of velocity profile will be used for experimental verification of CFD modelling of the flow stream in the tested distortion [ 5 , 6 , 7 ].…”

Section: Measurementsmentioning

confidence: 99%

“…In this case, the measuring accuracy of the devices should be as high as possible, assuming the lowest possible investment costs. That is why in each case of measurement, the most important factor is the selection of the best available measurement technique in relation to costs [ 7 , 8 , 9 ]. Performing flow measurements is characterized by a multitude of solutions, such as Pitot tubes, measuring orifices, turbine flow meters, bend flow meters, vortex flow meters, Coriolis flow meters, electromagnetic flow meters and ultrasonic flow meters [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Flow Disturbances behind the 90° Bend on the Indications of the Ultrasonic Flow Meter with Clamp-On Sensors on Pipelines

Synowiec

Andruszkiewicz

Wędrychowicz

et al. 2021

Sensors

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The subject matter of the article concerns velocities/flow rate measurements in the area of disturbed flows-behind the 90° bend. They were conducted by means of an ultrasonic flowmeter with clamp-on sensors on pipeline, for water and two different Reynolds numbers of 70,000 and 100,000, corresponding to two velocities of approximately 1.42 m/s and 2.04 m/s. The tests were carried out at 12 distances from the disturbance. Sensors on the circumference of the pipeline were mounted 30° each. The correction factor values were calculated for the given measurement geometry. The measurements have shown that the values of this coefficient are always greater than 1, which means that the ultrasonic flow meter understates the speed values. They also showed that already at a distance of 8 nominal diameters from the disturbance, the correction factor does not exceed 1.02, so the measurement errors are within the maximum permissible error (MPE) of a typical ultrasonic flow meter. For distances less than eight nominal diameters from the disturbance, not taking the correction factor value into the account can lead to systematic errors of up to 10.8%. Studies have also proved that in each measurement plane behind the disturbance there are two mounting angles for the ultrasonic sensors, 60° and 240° respectively, for which the correction factor values are minimal. Additionally, using the laser Doppler anemometry (LDA) method, velocity solids were determined at individual distances from the disturbance, and the projections of velocity blocks on the appropriate plane represented velocity profiles and indicated the distances from the disturbance at which these profiles stabilise.

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Section: Measurementsmentioning

confidence: 99%