The KAPRICCIO (The KAPPEL Ship Propulsion Concept, Improving Energy Efficiency and Reducing the Environmental Impact) project was a 1477KCU, EU funded, 60 month project starting in August 1997 with completion in July 2002.
One of the ways to improve the utilisation of energy used for propulsion in a ship is to improve the efficiency of the ship's propeller. Conventional propellers have, for practical purposes, reached the upper efficiency limit of their development and it is therefore necessary to look to innovative means of achieving significant improvements in this area. One such means is the application of non planar wing theory to propeller design. This theory was originally investigated and developed for use in the aviation industry and a number of commercial airliners now feature non planar wings in the form of winglets at the wing tips giving increased performance from the airfoil wing resulting in improved fuel consumption and a greater operating range. There is a history of technology transfer from the aviation industry to the marine industry.
The unique feature of the KAPPEL propeller is that the theory of non planar wings and winglets has been transformed to marine propellers and applied to a propeller concept where the propeller blade and "winglet" are designed as one integral curved blade to reduce the energy losses inevitably present at the ends or tips of airfoil devices.
The mathematical and physical modelling carried out indicated that it is realistic to expect fuel savings of up to 7% compared with a well designed conventional propeller. In the case of a medium sized container vessel of the type to be investigated in the project, this could amount to a daily fuel reduction of over six tonnes.
The main objectives of the KAPRICCIO project were to achieve:
· Higher propulsive efficiency which results in lower fuel consumption and reduced environmental pollution
· Improvement in shipboard environment regarding noise and vibration
· improvement in accuracy of prognosis especially for Kappel propellers (tip-fin propellers)
· improvement of Finite Element Analysis of material stresses of the unconventional propeller tip geometry;
· improvement of foundry technology.
The partners in this collaborative project were J J Kappel Marine Concept, Kvaerner Warnow Werft Gmbh, Stone Manganese Marine Ltd, Hamburgische Schiffbau-Versuchsanstalt , Danish Maritime Institute, Technical University of Denmark
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