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首页> 外文会议>ASME(American Society of Mechanical Engineers) Internal Combustion Engine Division Spring Technical Conference; 20060507-10; Aachen(DE) >ANALYSIS OF A HSDI DIESEL ENGINE INTAKE SYSTEM BY MEANS OF MULTI-DIMENSIONAL NUMERICAL SIMULATIONS: INFLUENCE OF NON UNIFORM EGR DISTRIBUTION
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ANALYSIS OF A HSDI DIESEL ENGINE INTAKE SYSTEM BY MEANS OF MULTI-DIMENSIONAL NUMERICAL SIMULATIONS: INFLUENCE OF NON UNIFORM EGR DISTRIBUTION

机译：多维数值模拟手段对HSDI柴油发动机进气系统的分析：EGR分布不均匀的影响

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摘要

In order to comply with stringent pollutant emissions regulations a detailed analysis of the overall engine is required, assessing the mutual influence of its main operating parameters. The present study is focused on the investigation of the intake system under actual working conditions by means of ID and 3D numerical simulations. Particularly, the effect of EGR distribution on engine performance and pollutants formation has been calculated for a production 6 cylinder HSDI Diesel engine in a EUDC operating point. Firstly a coupled 1D/3D simulation of the entire engine geometry has been carried out to estimate the EGR rate delivered to every cylinder; subsequently the in-cylinder flow field has been evaluated by simulating the intake and compression strokes. Finally the spray and combustion processes have been studied accounting for the real combustion chamber geometry and particularly the pollutants formation has been determined by using a detailed kinetic mechanism combustion model. The 1D/3D analysis highlighted a significant cylinder to cylinder EGR percentage variation affecting remarkably the pollutant emissions formation, as evaluated by the combustion process simulations. A combined use of commercial and in-house modified codes has been adopted.
机译：为了遵守严格的污染物排放法规，需要对整个发动机进行详细分析，评估其主要运行参数的相互影响。本研究的重点是通过ID和3D数值模拟对进气系统在实际工作条件下的研究。特别是，对于EUDC工作点的6缸HSDI柴油发动机，已经计算了EGR分布对发动机性能和污染物形成的影响。首先，已对整个发动机几何结构进行了1D / 3D耦合仿真，以估算输送到每个气缸的EGR率；随后，通过模拟进气冲程和压缩冲程评估了缸内流场。最后，对喷雾和燃烧过程进行了研究，以说明实际燃烧室的几何形状，尤其是通过使用详细的动力学机理燃烧模型确定了污染物的形成。 1D / 3D分析突出显示了汽缸对汽缸EGR的百分比变化，该变化显着影响了污染物排放的形成，如燃烧过程模拟所评估的那样。商业和内部修改代码的组合使用已被采用。

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