One possible way to reduce the fuel consumption and environmental impact of a ship is to move the propeller to a position behind the hull. This allows the propeller diameter to increase without risks of pressure pulses being transferred to the hull. An increase in efficiency may then be achieved, particularly if the stern wave can be used to increase the diameter.
This concept is referred to as the large area propeller (LAP) approach and is investigated in this project. Through systematic flow computations for different hulls and propeller positions substantial gains have been demonstrated.
The goal is to show that at least 10% reduction in fuel consumption can be obtained, and the results so far have indicated that this is well within reach.
Rolls-Royce, SSPA and FLOWTECH
Daniel Knutsson, Michal Orych and Lars Larsson.
Knutsson, D and Larsson, L, “Large Area Propellers”, Second International Symposium on Marine Propulsors, Hamburg, Germany, June 2011