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The wake structure of a propeller operating upstream of a hydrofoil

Published online by Cambridge University Press:  06 October 2020

Antonio Posa Open the ORCID record for Antonio Posa [Opens in a new window] ,
Riccardo Broglia Open the ORCID record for Riccardo Broglia [Opens in a new window]  and
Elias Balaras Open the ORCID record for Elias Balaras [Opens in a new window]
Antonio Posa*
Affiliation:
CNR-INM, Institute of Marine Engineering, National Research Council of Italy, Via di Vallerano 139, 00128Roma, Italy
Riccardo Broglia
Affiliation:
CNR-INM, Institute of Marine Engineering, National Research Council of Italy, Via di Vallerano 139, 00128Roma, Italy
Elias Balaras
Affiliation:
Department of Mechanical and Aerospace Engineering, The George Washington University, 800 22nd Street, N.W., Washington, DC20052, USA
*
†Email address for correspondence: antonio.posa@insean.cnr.it
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Abstract

Large eddy simulations are presented on the wake flow of a notional propeller (the INSEAN E1658), upstream of a NACA0020 hydrofoil of infinite spanwise extent, mimicking propeller–rudder interaction. Results show that the flow physics is dominated by the interaction between the coherent structures populating the wake of the propeller and the surface of the hydrofoil. The suction and pressure side branches of the tip vortices move towards inner and outer radii, respectively. The hub vortex is split into two branches at the leading edge of the hydrofoil. The two branches of the hub vortex shift in the opposite direction, compared to the tip vortices, towards the rudder suction sides. As a result, a contraction of the propeller wake on the suction sides occurs, leading to increased levels of shear stress and turbulence. At downstream locations along the hydrofoil the spanwise deflection of the suction side branches of the tip vortices affects the trajectory of the overall propeller wake, including also the smaller helical vortices across the span of the wake of each blade and the two branches of the hub vortex on the two sides of the hydrofoil. This cross-stream shift persists, producing a strong anti-symmetry of the overall wake.

JFM classification

Turbulent Flows: Turbulence simulation Wakes/Jets: Wakes Vortex Flows: Vortex dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 904 , 10 December 2020 , A12
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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