The combination of a slow-speed two-stroke diesel engine and a fixed pitch propeller is the most favourable propulsion system for large seagoing vessels, since both components feature outstanding simplicity and efficiency. However, they are disadvantageous where manoeuvrability is concerned. The crash-stop performance of such vessels is characterised by relatively long stopping distances. As this affects ship safety, a research project identified the engine as the origin of the problem, so a methodology has been developed for simulating engine behaviour during the manoeuvre, incorporating simplified models for the reproduction of the relevant boundary conditions, such as a propeller model as the connection between the engine and the vessel. A variation of the engine parameters having a possible influence on the manoeuvre has shown not to be of sufficient impact or not even technically feasible. Consequently, a novel method of applying a braking torque to the propeller by means of water injection into the cylinders during unfired operation is proposed.
Optimisation of the crash-stop manoeuvre of vessels employing slow-speed two-stroke engines and fixed pitch propellers
Journal of Marine Engineering & Technology ; 11 , 1 ; 35-43
2012-01-01
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Simulation of ship network behaviour during a crash stop manoeuvre
British Library Conference Proceedings | 1998
|Replacement of fixed pitch propellers. Practical experiences
Tema Archiv | 2002
|Fixed pitch propellers and diesel-electric propulsion
Tema Archiv | 1989
Practical experiences: Replacement of fixed pitch propellers
Online Contents | 2002