【作者】

Christopher Huber

【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。 The large engines have foregone an exciting evolution since new exhaust emission regulations have been issued during the first decade of the 21st century. At the time when this paper will be published, the implementation dates of all of the new emission regulations for various large engine applications will be a matter of the recent past. Many engine platforms evolved through a process driven by environmental requirements and application specifics, such as power increase, power nodes coverage and fuel versatility. Some existing engine platforms, mature in their lifetime, underwent at the same time major modernization programs. Last but not least, totally new engine platforms were designed and introduced to the market, facing the combined challenge of the right positioning and product differentiation, on top of the challenges specific to the current era. As a result, the modern large engines of today have become highly performant and complex. Power density levels of up to 50 kW/Liter for high speed engines, and up to 25 kW/Liter for medium speed engines are state of the art. The rotational speeds have increased: the medium speed engines evolved beyond 11 m/s, while the high speed engines went past 13 m/s mean piston speed. Overall, the modern engines feature now new technologies, such as high pressure injection, variable gas exchange and turbocharging, electronics and smart controls commanded by sophisticated algorithms and software, and new systems, like exhaust gas aftertreatment systems, exhaust gas recirculation systems, liquid and gaseous fuel admission systems coexisting on the same product, controls and monitoring systems. The combination of power and operational requirements with emission-compliance-driven technologies result often in a higher structural and thermal engine loading situation. Under this background, the present paper addresses the task of high speed and medium speed engine validation, imbedded into the overall engine design and development process. The holistic engine design and development process approach, depending on the CAE front loading, with a first-time-right spirit, is discussed as the basis for engine validation. Based on concrete engineering examples, an emphasis will be made on the use of simulation results for virtual pre-validation and the correlation to component loading measurements and functional development during engine testing. The causality path from product definition, through exhaust emission compliance and the required technology building blocks, down to the concrete combustion, engine architecture and materials solution and the resulting engine loading situation is generically explained in the paper for typical high speed and medium speed engine builds. By this, the ground is prepared for engine validation, which will be described in terms of the overall structured validation process, along AVL’s load matrix approach, as well as in the form of individual validation activities, as they are required by the specific engineering solution. Examples of engine systems and components instrumentation, measurement results, their criticality and how they can be positively be influenced by the integrated virtual and experimental validation approach are shown. Overall, the paper will contribute with the proposition of an overall approach to engine validation under the specific circumstances of exhaust emission compliance, engine loading and application requirements.

【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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