The objective of this paper is to present long time continuously measured diesel engine performance data for large 2-stroke diesel engines in propulsion applications. The unique feature is that every single stroke is measured and used in the data evaluation. The authors show how this feature makes it possible to identify errors in the engine at a very early stage, and to follow up the running conditions of the engine. The measurement system used is the Cylmate R Diesel Engine Performance Monitoring System. The system measures the combustion pressure continuously in real time and in all cylinders in parallel. Further, the crank angles for each cylinder are calculated with high precision using accurate flywheel angle measurement and a calculation model for the twist of the crankshaft. The authors present data obtained from five different vessels. An application case from the vessel M/V Malmoe Link is outlined. Due to continuous measurement and supervision of the combustion process, the crew detected a fault in the cooling of a fuel valve. The vessel M/V Hanjin Ottawa is equipped with a power meter which makes it possible to compare indicated power and brake power. The authors have also computed the mechanical efficiency and the loss power stroke by stroke. An application case, where a beginning fault of an exhaust gas valve was detected is presented. Data from the two sister vessels M/V Anna Maersk and M/V Axel Maersk are compared showing a very close agreement in the measured parameters. When analyzing data from M/V Axel Maersk a change in the combustion process was identified. It was later confirmed by the crew that a change of fuel with a following adjustment of the engine had taken place at that time. The longest period of time with continuously measured data presented in this paper is from M/V Anna Maersk. These data covers 81 days of operation where approximately 7.3 million strokes per cylinder were measured and used in the analysis. Three of the pressure transducers on M/V Maersk Arun are early prototypes and have been in continuous operation since the installation in year 2001. The authors show data with more than two years interval showing close agreement.
Stroke by stroke measurement of diesel engine performance on board
Arbeitsspielmessungen an Dieselmotoren on-Board
2004
12 Seiten, 39 Bilder, 4 Tabellen
Aufsatz (Konferenz)
Datenträger
Englisch
Stroke by stroke measurement of diesel engine performance on board
Kraftfahrwesen | 2004
|Engineering Index Backfile | 1940
|Kraftfahrwesen | 1998
|Engineering Index Backfile | 1940
|British Library Conference Proceedings | 1998
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