【作者】

Jose Luis Garcia

【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 Trunk piston engines (medium speed) for the marine and power generation sector have significantly developed in recent years. Tightening emissions controls, efficiency and fuel flexibility are driving engine technology evolution to satisfy increasingly demanding market needs and regulations. To address these requirements, well stablished concepts like miller timing, increased compression ratios and dual or multi-fuel engine designs continue to expand to medium speed engines applications. For engine oils used in these applications, all these approaches have resulted in exposure to higher oil stresses that accelerate oil degradation which is reflected in reduced oil service life as condemnation limits are reached faster particularly in terms of base number depletion and lubricant viscosity increase. Faciung these challenges, it is expected that commercial trunk piston engine oil (TPEO) technologies are undergoing the next development cycle, as more demanding applications penetrate the market and most of current lubricant products have been available for over a decade. Screening performance improvements for new TPEO developments utilizing only laboratory and bench tests approaches can be challenging as normally lubricant performance aspects are tested separately and their correlation to more demanding applications in the field might not be well established. In particular this paper will highlight the increasing relevance of using engine testing tools on top of traditional approaches to develop TPEOs and challenge some bench testing and performance relationships. The authors will discuss some aspects of utilizing a single cylinder research engine fuelled with HFO to demonstrate the effect of oil stress in lubricant performance as well as the capability of this tool to discriminate for lubricant performance improvements particularly around aspects of engine cleanliness, viscosity control and alkaline reserve depletion. Improved test protocols and engine control systems for Shell’s Caterpillar-AVL test engine (1-cylinder AVL diesel engine LEF model with a Caterpillar 1Y540 top construction) will be presented to show how this tool can be utilized to generate reliable and repeatable test data for discovery and benchmarking purposes, highlighting discrimination for high performance candidate formulations to prove their robustness and readiness for further testing in full size engines such as Shell’s Wärtsilä 4L20D as well as field engines running under conditions capable to discriminate the performance of a lubricant.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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