Low-aspect ratio appendages for wind-assisted ships

van der Kolk, N.J.; Akkerman, I.; Keuning, J.A.; Huijsmans, R.H.M.

doi:10.1007/s00773-020-00777-8

Low-aspect ratio appendages for wind-assisted ships

Title

Low-aspect ratio appendages for wind-assisted ships

Author

van der Kolk, N.J. (Blue WASP)
Akkerman, I. (TU Delft Ship Hydromechanics and Structures)
Keuning, J.A. (TU Delft Ship Hydromechanics and Structures)
Huijsmans, R.H.M. (TU Delft Ship Hydromechanics and Structures)

Date

2021

Abstract

Wind propulsion for commercial ships has been identified as a key component in the energy transition for the maritime industry. The sailing hybrid ship will operate with leeway (drift) angles to produce a lateral force known as sideforce, for steady operation under sail. In this paper, experimental results for the sailing performance of ships fitted with bilge keel appendages are presented. Systematic variations in appendage height, length, and position were tested, including several special cases (multiple bilge keels). The appendage typology is shown to mitigate the strong ‘destabilizing’ yaw moment that is characteristic of wind-assisted commercial vessels and to promote the non-linear sideforce component. The working principal for bilge keels—promotion of flow separation—can be employed to specify the separation location for components of the vessel vortex wake to improve the sailing performance of the ship.

Subject

Green ships
Hydro-mechanics
Naval architecture
Ship maneuvering
EEXI/EEDI

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http://resolver.tudelft.nl/uuid:05d7387d-fc7e-4cc5-8b37-b6bbe27e8976

DOI

https://doi.org/10.1007/s00773-020-00777-8

ISSN

0948-4280

Source

Journal of Marine Science and Technology, 26 (4), 1126-1143

Part of collection

Institutional Repository