Comparison of velocity and turbulence profiles obtained with a Vectrino Profiler and PIV

Jay Lacey,Bruce Macvicar,Jason Duguay,A Paquier,N Rivière

doi:10.1051/e3sconf/20184005070

Jay Lacey, Bruce Macvicar + Show 3 more

Open Access

https://doi.org/10.1051/e3sconf/20184005070

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Abstract

Laboratory experiments were carried out in a small openchannel hydraulic flume at the Université de Sherbrooke. A PIV and an acoustic Doppler velocity profiler (Vectrino II (VII)) were used to measure high frequency velocities in profiles along the centreline of a small openchannel flume. Two background turbulence levels were tested. Comparisons were made of mean and turbulent statistics obtained with the two measurement techniques. The results show reasonable agreement between mean streamwise and lateral velocities measured with the PIV and VII near the “sweet spot” of the VII. In contrast, mean vertical velocities deviate substantially between the two measurement methods. Turbulence statistics have somewhat similar profile shapes, yet significant bias is observed between the two measurement methods.

Highlights

The Nortek Vectrino Profiler (or Vectrino II (VII)) has been commercially available since 2011
The current study investigates velocity measurements obtained using a VII that was recalibrated in 03/2016
The higher value obtained from the particle image velocimetry (PIV) measurements is anticipated as the centreline velocity is maximized compared with the flow closer to the side walls

Summary

Introduction

The Nortek Vectrino Profiler (or Vectrino II (VII)) has been commercially available since 2011. The VII is an acoustic Doppler velocity profiler (ADVP), which measures high frequency velocities in up to 35 cells over a 0.035 m profile. Preliminary studies using the VII have raised issues concerning the reliability of the measured velocities and estimated turbulence statistics [1]. Given these concerns, few studies have to date been published based on VII data. Leng and Chanson [2] conducted a thorough comparison between velocities and standard deviations obtained with the VII and a Nortek Vectrino. Leng and Chanson [2] conclude that the instruments showed close agreement, yet admit that the agreement is within an order of magnitude

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