Abstract
Experimental work has been performed in order to gain a better understanding of the flow around vortex flowmeters in perturbed flow conditions. As part of a larger study, extensive results on the effect of pulsatile flow conditions, with and without acoustic coupling, on the dynamic behaviour and resulting metering errors are presented. These measurements were performed on various water tunnel and aerodynamic facilities in rectangular (2D) of circular (3D) tunnel sections incorporating the same bluff-body geometry. The 3D case corresponds to an industrial flowmeter. The measurement techniques consist of flow visualization and image processing, unsteady velocity and pressure measurements, and, finally, signal analysis. The effect of Reynolds number, pulsation (frequency and amplitude) and acoustic characteristics of the facility on the lock-on phenomenon were studied and analysed.
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