PERFORMANCE PREDICTION OF NEXT GENERATION SLOW SPEED DIESEL ENGINES DURING SHIP MANOEUVRES

By extrapolating the current trends in BMEP, maximum cylinder pressure, boost pressure and stroke-bore ratio of large two-stroke direct-drive marine propulsion diesel engines, possible design specification values for the next generation of these engines can be derived. A simulation program was used progressively to achieve such projected engine operating values, starting from a baseline conventional present day engine. A model of the baseline engine was used in conjunction with models of ship and propeller hydrodynamics so as to predict the propulsion system behaviour under transient conditions during ship manoeuvring. These predictions were compared with available shop tests and ship trials data. The engine model is a large, very detailed thermodynamic performance prediction program, where the processes and states of the working fluid are considered in every engine cylinder for each fraction of a crank angle. The structure of the model and the various sub-process models as well as the models for the governor and the engine remote control system are presented. The ship and propeller models are continuous non-linear simulations of manoeuvring and thrust characteristics, which can cover complex models of ship motion, as for example for the ship ahead and turning while the propeller is reversing. The simulation program was used to predict the performance and transient response of a 'next generation' rated engine, coupled to a typical large tanker. The results show that problems may be faced with such high rated engines with the flow range and response of very high boost, single stage turbochargers.

• Supplemental Notes:
  • Inst Marine Engrs Trans, v 106 pt 1, 1994, p 1 [25 p, 24 ref, 2 tab, 17 fig]
• Authors:
  • KYRTATOS, N P
  • Koumbarelis, I
• Publication Date: 1994

Language

• English

Subject/Index Terms

• TRT Terms: Diesel engines; Maneuvering; Performance; Simulation
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00727433
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Nov 1 1996 12:00AM