Experimental Experience Gained with a Long-Stroke Medium-Speed Diesel Research engine using Two Stage Turbo Charging and Extreme Miller Cycle.
The objective of the paper is to present experimental results gained from a long-stroke medium speed diesel engine. The study is carried out on the 3-cylinder long-stroke FMC 4524 research engine located at Flensburg University of Applied Sciences in cooperation with ABB Turbo Systems, Baden. Based on a IMO II Layout of the engine featuring High stroke / bore ratio of s/d = 450mm/240mm = 1,875, optimized mechanical efficiency based on crankshaft design acc. to classification rules, combustion chamber design optimized for high compression ratio ( =17.8), 2 stage High Pressure Injection System with variable injection pressure, Single Stage Turbo Charging, and standard Inlet Valve Timing, Two Stage Turbo Charging and Miller Cycle Inlet Valve Timing were applied in several steps. In parallel modifications to the exhaust gas system were applied to improve part load and startup performance. Also variations of exhaust gas valve timing and injection characteristics were executed. The project is primarily aimed at reduction of CO2- and PM-Emissions in the envelope of IMO III exhaust gas regulations for non ECAs. In an intermediate development step Inlet Valve Timing was moved to 42°CA before BDC (Miller 42) and 50°CA before BDC (Miller 50). The first results of Miller 42 showed a reduction of fuel consumption to 168 g/kWh, meaning a CO2-Emission reduction of app. 6% based on the values of the base engine. PMEmissions stayed constant on the low level of the base engine. In opposition to the expected trend Nitric Oxide Emissions could be reduced by 20% down to about 8g/kWh. Further development steps will include tests with more extreme Miller-Configurations up 60°CA before BDC. Additionally, pilot-application of other means for emission control like EGR and Fuel-Water emulsion are planned to evaluate further emission reduction potential aiming at emission regulations for ECAs.
Mathias Fiedler Hugo Fiedler Peter Boy
FMC Fiedler-Motoren GmbH,Germany Flensburg University of Aplied Sciences,Germany
国际会议
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2013-05-13（万方平台首次上网日期，不代表论文的发表时间）