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Experimental Evaluation of Advanced Turbocharger Performance on a Light Duty Diesel Engine

机译：轻型涡旋发动机高级涡轮增压器性能的实验评价

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For diesel engines to meet current and future emissions levels, the amount of EGR required to reach these levels has increased dramatically. This increased EGR has posed big challenges for conventional turbocharger technology to meet the higher emissions requirements while maintaining or improving other vehicle attributes, to the extent that some OEMs resort to multiple turbocharger configurations. These configurations can include parallel, series sequential, or parallel - series turbocharger systems, which would inevitably run into other issues, such as cost, packaging, and thermal loss, etc. This study, as part of a U.S. Department of Energy (USDoE) sponsored research program, is focused on the experimental evaluation of the emission and performance of a modern diesel engine with an advanced single stage turbocharger. A production IHI (Ishikawajima Harima Heavy Industries) turbocharger was selected as the base architecture for the turbocharger design with optimizations focused on compressor impeller and turbine wheel designs. An advanced impeller design was used on the compressor side to improve the efficiency and surge margin at low mass flow areas of the compressor map, allowing greater EGR flow while extending the flow capacity by using an active casing treatment on the compressor cover. Mixed flow turbine technology was used on the turbine side, due to its performance characteristics; particularly high efficiency at low speed ratios relative to the base conventional radial flow turbine. This characteristic is relevant to increased EGR operation required for future diesel applications. Both steady state and transient engine dynamometer testing of FTP transient cycles at Tier II Bin 5 emission levels show that the advanced turbocharger technology enables around 3% fuel economy improvement on the engine while meeting the same emissions level.
机译：对于柴油发动机来满足当前和未来的排放水平，达到这些水平所需的EGR量急剧增加。这种增加的EGR对传统的涡轮增压器技术构成了大量挑战，以满足更高的排放要求，同时保持或改善其他车辆属性，在某些OEM诉诸多涡轮增压器配置的程度上。这些配置可以包括并行，串联顺序或并联系列涡轮增压器系统，这不可避免地遇到其他问题，例如成本，包装和热损失等。本研究，作为美国能源部（USDOE）的一部分赞助研究计划，专注于具有先进单级涡轮增压器的现代柴油发动机排放和性能的实验评价。生产IHI（Ishikawajima Harima Repend Industries）涡轮增压器被选为涡轮增压器设计的基础架构，优化专注于压缩机叶轮和涡轮机轮设计。压缩机侧使用先进的叶轮设计，以提高压缩机图的低质量流量区域的效率和浪涌裕度，允许更大的EGR流通过在压缩机盖上使用有源壳体处理来延长流量。混合流动涡轮机技术在涡轮侧使用，由于其性能特性;相对于基础传统径向流动涡轮机的低速比以低速比的特别高效率。这种特性与未来柴油应用所需的EGR操作增加。在Tier II Bin 5排放水平下FTP瞬态循环的稳态和瞬态发动机测力计测试显示，先进的涡轮增压器技术在符合相同排放水平时，发动机的燃油经济性提高约3％。

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