The University of Southampton
University of Southampton Institutional Repository

Wind tunnel tests on the influence of propeller loading and the effect of a ship hull on skeg-rudder performance

Molland, A.F., Turnock, S.R. and Smithwick, J.E.T. (1995) Wind tunnel tests on the influence of propeller loading and the effect of a ship hull on skeg-rudder performance , Southampton, UK University of Southampton 187pp. (Ship Science Reports, 90).

Record type: Monograph (Project Report)

Abstract

The results of wind tunnel tests on a rudder operating downstream of a propeller and hull combination are presented. The tests used the 3.5m x 2.5m low speed wind tunnel at the University of Southampton. This report presents the results for two rudders, one all-movable the other a semi-balanced skeg-rudder. The rudders both have a mean chord of 667mm and NACA 0020 sections, but with varying taper ratio. A four bladed, 800mm diameter, adjustable pitch propeller was used. This propeller is a modified version of the Wageningen B4.40 series. Open-water results for the modified design were validated against published data. The rudder propeller combinations were tested both in a freestream and in way of a representative Mariner stern hull form.

The test consisted of a series of parametric studies into the effect of the longitudinal and lateral distance between the propeller and rudder, propeller thrust loading, presence of a hull, and presence of a hull at a yaw angle. A five-component strain-gauge dynamometer was used to measure lift, drag and three moments on the rudder. A rotating strain gauge dynamometer measured the developed thrust and torque of the propeller. In addition, both spanwise and chordwise pressure distributions were measured on the rudder and hull surface to provide a detailed knowledge of the distribution of forces over the hull and the rudder. A tunnel wind speed of 10m/s was used and propeller revolutions were varied between 0 and 2100 rpm.

Results are presented in the form of non-dimensional coefficients of lift (C subscript L), drag (C subscript D), spanwise (CP subscript S) and chordwise (CP subscript C) position of the centre of pressure variation with incidence for the rudder. The influence of rudder on propeller performance is given in terms of non-dimensional thrust (K subscript T) coefficient variation with advance ratio (J). The surface pressure measurements on the rudder are presented as both a spanwise distribution of the local lift coefficient and as a surface pressure distribution. The surface pressure measurements on the hull are presented as spanwise and chordwise distritbutions together with integrated normal force coefficient over the range of rudder angles.

The results provide data data for detailed rudder design, for numerical modelling of the rudder/propeller and hull interaction problem and for use in manoeuvring simulations.

PDF 090.pdf - Version of Record
Download (4MB)

More information

Published date: 1995
Additional Information: ISSN 0140-3818

Identifiers

Local EPrints ID: 46047
URI: http://eprints.soton.ac.uk/id/eprint/46047
PURE UUID: 3ff11acb-86e2-4533-bc0d-33e11771c5da
ORCID for S.R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 16 May 2007
Last modified: 17 Jul 2017 15:09

Export record

Contributors

Author: A.F. Molland
Author: S.R. Turnock ORCID iD
Author: J.E.T. Smithwick

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×