Time-resolved measurements with a vortex flowmeter in a pulsating turbulent flow using wavelet analysis

Authors: Laurantzon, F, Örlü, R., Segalini, A. S., Alfredsson, P.H.
Document Type: Article
Pubstate: Published
Journal: Meas. Sci. Technol.
Volume: 21   123001
Year: 2010


Vortex flowmeters are commonly employed in technical applications and are obtainable in a variety of commercially available types. However their robustness and accuracy can easily be impaired by environmental conditions, such as inflow disturbances and/or pulsating conditions. Various post-processing techniques of the vortex signal have been used, but all of these methods are so far targeted on obtaining an improved estimate of the time-averaged bulk velocity. Here, on the other hand, we propose, based on wavelet analysis, a straightforward way to utilize the signal from a vortex shedder to extract the time-resolved and thereby the phase-averaged velocity under pulsatile flow conditions. The method was verified with hot-wire and laser Doppler velocimetry measurements.