On the Selection of Optimal Propeller Diameter for a 120m Cargo Vessel
Paper in proceeding, 2018

In the preliminary design of a propulsion unit the selection of propeller diameter is most commonly based on open water tests of systematic propeller series. The optimum diameter obtained from the propeller series data is however not considered to be representative for the operating conditions behind the ship, instead a slightly smaller diameter is often selected. We have used computational fluid dynamics (CFD) to study a 120m cargo vessel with an integrated rudder bulb-propeller hubcap system and a 4-bladed propeller series, to increase our understanding of the hydrodynamic effects influencing the optimum. The results indicate that a 3-4 % smaller diameter is optimal in behind conditions in relation to open water conditions at the same scale factor. The reason is that smaller, higher loaded propellers perform better together with a rudder system. This requires that the gain in transverse kinetic energy losses thanks to the rudder overcomes the increase in viscous losses in the complete propulsion system

Author

Jennie Andersson

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Robert Gustafsson

Rolls-Royce (Swe)

Arash Eslamdoost

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Rickard Bensow

Chalmers, Mechanics and Maritime Sciences, Marine Technology

SNAME 15th Propeller and Shafting Symposium, PSS 2018

SNAME 15th Propeller and Shafting Symposium, PSS 2018
Norfolk, United Kingdom,

Analysis and optimisation of marine propulsion systems

Rolls-Royce (Swe), 2014-10-06 -- 2017-09-30.

Swedish Energy Agency (38849-1), 2014-10-06 -- 2017-09-30.

Subject Categories

Applied Mechanics

Vehicle Engineering

Fluid Mechanics and Acoustics

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.5957/PSS-2018-11

More information

Latest update

11/5/2021