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首页> 外文期刊>International Journal of Engine Research >Optimization study of the effects of bowl geometry, spray targeting, and swirl ratio for a heavy-duty diesel engine operated at low and high load
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Optimization study of the effects of bowl geometry, spray targeting, and swirl ratio for a heavy-duty diesel engine operated at low and high load

机译：在低负荷和高负荷下运行的重型柴油机的转鼓几何形状，喷射目标和涡流比的影响的优化研究

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摘要

Optimization tools are used to recommend low-emission engine combustion chamber designs, spray targeting, and swirl ratio levels for a heavy-duty diesel engine operated at low load and high load. A non-dominated sorting genetic algorithm (NSGA II) was coupled with the KIVA computational fluid dynamics (CFD) code, as well as with an automated grid generation technique to conduct the multi-objective optimizations with goals of low emissions and improved fuel economy. The study identifies the aspects of the combustion and pollution formation that are affected by mixing, and offers guidance for better matching of the piston geometry with the spray plume geometry for enhanced mixing. By comparing the optimal results of low-load and high-load cases, the study reveals that different injection strategies and matching of the piston geometry with the spray plume are needed for different operating conditions. A non-parametric regression analysis tool was also used to post-process the optimized results in order to provide an understanding of the effects of each optimized parameter on fuel economy and pollutant formation. It was found that an optimal combination of spray targeting, swirl ratio, and bowl geometry exists that simultaneously minimizes emissions formation and offers improved fuel consumption.
机译：对于在低负荷和高负荷下运行的重型柴油发动机，使用优化工具来推荐低排放发动机燃烧室设计，喷雾目标和涡流比水平。非主导的排序遗传算法（NSGA II）与KIVA计算流体动力学（CFD）代码以及自动网格生成技术结合在一起，以实现低排放和提高燃油经济性为目标的多目标优化。该研究确定了受混合影响的燃烧和污染形成的各个方面，并为更好地匹配活塞几何形状与喷雾羽流几何形状以增强混合提供了指导。通过比较低负荷和高负荷工况的最佳结果，研究表明，对于不同的工况，需要采用不同的喷射策略以及将活塞几何形状与喷雾羽相匹配。还使用非参数回归分析工具对优化结果进行后处理，以了解每个优化参数对燃油经济性和污染物形成的影响。已发现，存在喷雾目标，涡流比和转鼓几何形状的最佳组合，可同时减少排放物的形成并改善燃料消耗。

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