Flettnerrotorn - Ett framdriftshjälpmedel för fartyg
Examensarbete på grundnivå
Sjöingenjör 180 hp (sjöingenjörsexamen)
An increased environmental threat and tougher market requirements for emissions of greenhouse gases will lead to ships making new approaches to cope with the climate targets. The Flettner rotor was presented in the 1920s for wind assisted propulsion ships and has recently got an increased interest as a partial solution of reducing the fuel consumption, thus greenhouse gases of the ships. The Flettner rotor consist of a cylinder which during rotation use the principle of the Magnus effect to create pressure differences around the cylinder which can be used to provide a propulsive force. This study will determine if the Flettner rotor is a genuine propulsion means for ships for reducing the emissions and if it affects the crew and the current propulsion system onboard. The results shows that the reduction in average fuel consumptions varies from a few percent to sometimes be able to generate a propulsion force so great that it can replace the force obtained normally by the main engine completely, thus save momentary a huge amount of fuel. How much fuel savings that are obtained depends on the Flettner rotor properties, its installation, its routes and service speed in which the ship operates. The greatest propulsion power is obtained when strong winds strike the ship approximately perpendicular to the ship’s course. The percentage of fuel savings is affected by the ships service speed. This is because the required propulsion power is very high if the ship runs in high speeds. This makes the percentage of fuel saving low for high-speed ship. The Flettner rotors runs automatically and shuts off by itself when the winds are too strong. The maintenance of the Flettner rotors is done by the manufacturers via a service agreement but can optionally be done by the crew instead.
Maskinteknik , Energi , Transport , Mechanical Engineering , Energy , Transport