【作者】

Shinsuke Murakami

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC世界大会上发表，论文的版权归CIMAC所有。 For high-speed engines of the 5 to 6 liter per cylinder displacement class, the holistic gas engine development approach starts with the diversity of diesel engine applications such as Electric power generation, Marine, Locomotive, Oil & Gas and Industrial. Each of these applications has its specific challenges with respect to power density, packaging constraints, altitude capability and wide range of emission compliance solutions covering from less regulated countries (EPA Tier2 and below) to high regulated countries (EPA Tier 4, EU V and beyond). For a gas or dual fuel engine, this subsequently means that the major design boundaries are often already fixed being derived from such diverse requirements for the diesel engine. Mobile gas applications are an upcoming requirement in addition to conventional power generation application. In this content fleet management and real duty cycle aspects play a role when deciding if an arranged combination of dedicated (pure) gas and diesel engines or if substitution or dual fuel engines are a successful solution. Here the inconsistent availability of the gas infrastructure might require a 100% diesel capability or a “limp home diesel operation capability”. In view of the potential in cutting fuel costs, specific applications e.g. gas driven fracturing and drilling are of interest including the challenge to operate the engine with specific gases such as field and flare gas (large bandwidth of varying calorific values and methane numbers) still ensuring future emission compliance. Considering these aspects, this paper describes the challenges for the development of gas and dual fuel engines with the intention to show where the emphasis with respect to a combination of scientific work, analysis and simulation and classical engineering tasks shall lay on in order to guarantee a successful development. One of the most important building blocks are the experimental investigations on a single cylinder engine including the baseline development regarding methods und algorithms to detect knocking & misfiring and the validation of the combustion system. Fed by exhaust gas from the single cylinder engine, catalyst samples are characterized in parallel using a mobile catalyst analyzer in order to define overall strategies for NOx, CO and Methane slip reduction. In addition, some mechanical development tasks such as assessment of core component temperatures (nozzle tip temperatures of dual fuel injector), valve train development and piston bore interface development are covered. This early experimental results are used as validation base for the CFD simulations of the in-cylinder flow and combustion and for the base thermodynamic engine layout. Subsequently the experimental results are used for transient simulations (Cruise M) optimizing the control functions for the engine ECU at a very early stage, tested in a XiL environment.

【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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