【作者】

Matti Vaarasto

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。ABSTRACT Wärtsilä has performed full-scale engine tests with advanced Miller timing and 2-stage turbocharging on diesel engines in the Engine Laboratory since year 2006. The main objective was to explore the potential of advanced Miller timing as a means to reduce NOx emissions and fuel consumption and also to explore the potential for increased power density. Totally eight test engines of different types, including a single-cylinder research engine, have been tested since then at an overall pressure ratio (PIC) of up to 13 and brake mean effective pressure (BMEP) of up to 36 bar. The total operating time of these engines was 11400 hours, and most of the operation was on heavy fuel. With gas engines, both spark-ignited gas (SG) engines and dual fuel (DF) engines testing started in 2011. The main objective with these tests was to explore the potential for an increased BMEP through a widened operating window between knock and misfiring limits. Considerably higher engine efficiency was also expected. Totally six test engines of different type and size, including a single-cylinder research engine, have been tested. The total operating time of these test engines is 6500 hours. A BMEP of up to 32.5 bar was reached without facing problems with self-ignition and knocking. The highest overall PIC run on the gas versions is ca 9.0.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

4

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