Influence of propeller loading on ship rudder performance
Influence of propeller loading on ship rudder performance
The results of wind tunnel experiments on typical ship rudders and propeller combinations are presented. The experiments simulated the condition of a rudder operating aft of a propeller but without the influence of the hull. Three rudder types were tested, a semi-balanced skeg rudder 'th taper ratio 0.8 and all movable rudders with taper ratios of 0.8 and 1.0. The propeller was modelled on a Wageningen B4.40. The longitudinal separation of rudder and propeller was varied, and by extending the span of the rectangular rudder an insight into the influence of propeller diameter/rudder span was provided. Results are presented for each rudder as lift and drag coefficients and centre of pressure for selected angles of attack and changes in propeller thrust loading. Surface pressure distributions over the rudder were also obtained in order to provide a detailed knowledge of the distribution of forces over the rudder. The results demonstrate the controlling influence of propeller thrust loading on basic rudder forces and on the movement of rudder centre of pressure. The changes in stall characteristics and stall angle due to propeller action were also identified. The results provide force data for use in manoeuvring calculations and detailed data for- the validation of numerical modelling of the interaction problem.
ship rudder, ship propeller, wind tunnel, validation data
105-120
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
1992
Molland, A.F.
917272d0-ada8-4b1b-8191-1611875ef9ca
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Molland, A.F. and Turnock, S.R.
(1992)
Influence of propeller loading on ship rudder performance.
Transactions of the Royal Institution of Naval Architects, 135, .
Abstract
The results of wind tunnel experiments on typical ship rudders and propeller combinations are presented. The experiments simulated the condition of a rudder operating aft of a propeller but without the influence of the hull. Three rudder types were tested, a semi-balanced skeg rudder 'th taper ratio 0.8 and all movable rudders with taper ratios of 0.8 and 1.0. The propeller was modelled on a Wageningen B4.40. The longitudinal separation of rudder and propeller was varied, and by extending the span of the rectangular rudder an insight into the influence of propeller diameter/rudder span was provided. Results are presented for each rudder as lift and drag coefficients and centre of pressure for selected angles of attack and changes in propeller thrust loading. Surface pressure distributions over the rudder were also obtained in order to provide a detailed knowledge of the distribution of forces over the rudder. The results demonstrate the controlling influence of propeller thrust loading on basic rudder forces and on the movement of rudder centre of pressure. The changes in stall characteristics and stall angle due to propeller action were also identified. The results provide force data for use in manoeuvring calculations and detailed data for- the validation of numerical modelling of the interaction problem.
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Published date: 1992
Keywords:
ship rudder, ship propeller, wind tunnel, validation data
Organisations:
Fluid Structure Interactions Group
Identifiers
Local EPrints ID: 66474
URI: http://eprints.soton.ac.uk/id/eprint/66474
ISSN: 0035-8967
PURE UUID: 8b8a7f47-5e68-4e41-9dc2-3359c2b3ab3b
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Date deposited: 22 Jun 2009
Last modified: 11 Dec 2021 02:44
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