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Propeller wake evolution mechanisms in oblique flow conditions

Published online by Cambridge University Press:  27 April 2018

M. Felli Open the ORCID record for M. Felli [Opens in a new window]  and
M. Falchi
M. Felli*
Affiliation:
INSEAN-CNR, National Research Council, Maritime Research Centre, Via di Vallerano 139, 00128 Roma, Italy
M. Falchi
Affiliation:
INSEAN-CNR, National Research Council, Maritime Research Centre, Via di Vallerano 139, 00128 Roma, Italy
*
†Email address for correspondence: mario.felli@cnr.it
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Abstract

In the present study the wake flow past an isolated propeller operating in oblique flow conditions is investigated experimentally. In particular, the investigation concerns a systematic topological comparison of the wake behaviour in axisymmetric and in oblique inflow conditions, for three inclination angles, and is focused on an analysis of the underlying mechanisms of wake evolution and instability. To this end, the experiment has been designed to investigate the dynamics of propeller vortical structures over a wide spatial extent covering the wake region from the propeller disk up to 4.5 diameters in the streamwise direction. Detailed flow measurements have been undertaken by particle image velocimetry (PIV), using a multicamera configuration with three cameras arranged side by side. This allowed simultaneous acquisition of a large flow extent at a spatial resolution adequate to resolve the smallest vortical structures involved in the process of propeller wake instability. The analysis has been based on both phase-locked averaged and instantaneous flow fields. The study extends the knowledge on the subject of propeller wake dynamics, highlighting the major hydrodynamic effects that non-axisymmetric propeller operating conditions exert on the mechanisms of wake evolution, instability and breakdown, such as asymmetric destabilization of the tip vortices on the leeward and windward sides of the wake, and the interference between the tip and the junction vortices, as well as the cause–effect relation between the breakdown of the blade trailing wake and the instability of the tip and hub vortices.

JFM classification

Vortex Flows: Vortex dynamics Vortex Flows: Vortex instability Vortex Flows: Vortex interactions

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JFM Papers
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Journal of Fluid Mechanics , Volume 845 , 25 June 2018 , pp. 520 - 559
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© 2018 Cambridge University Press 

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