The Effects of Exhaust Back Pressure on Conventional and Low-Temperature Diesel Combustion
The Effects of Exhaust Back Pressure on Conventional and Low-Temperature Diesel Combustion
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DOI：
10.1177/09544070jauto1577
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发表时间：
2011-01
期刊：
影响因子：
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通讯作者：
S. Cong;C. Garner;G. McTaggart-Cowan
中科院分区：
文献类型：
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作者：
S. Cong;C. Garner;G. McTaggart-Cowan
现代柴油发动机的系统和后处理复杂性不断增加，这可能导致排气背压（EBP）显著增加。这增加了被困残留物的数量，提高了充电温度，但降低了氧浓度。在这项工作中，研究了常规和低温柴油燃烧（LTC）制度下EBP对柴油机性能和排放的影响。增加EBP会导致两种燃烧模式的泵送工作量增加。对于常规柴油燃烧，EBP对燃烧和排放的影响不显著，而对于LTC，较高的背压影响了燃烧和排放的形成过程。在低负荷工况下，装药温度的提高促进了燃烧；在中等负荷条件下，氧浓度的降低延迟了它。在中等负荷条件下，较高的背压显著减少了烟雾排放。
Modern diesel engines are seeing increasing system and after-treatment complexity which can lead to significant increases in the exhaust back pressure (EBP). This increases the amount of trapped residuals, raising the charge temperature but reducing the oxygen concentration. In this work, these effects of the EBP on diesel engine performance and emissions under conventional and low-temperature diesel combustion (LTC) regimes were investigated. Increasing the EBP resulted in higher pumping work for both combustion modes. While for conventional diesel combustion the effect of the EBP on combustion and emissions were not significant, for LTC the higher back pressures influenced the combustion and emissions formation processes. At low-load conditions, the increase in the charge temperature advanced combustion; at intermediate-load conditions, the reduction in the oxygen concentration delayed it. Smoke emissions were significantly reduced by a higher back pressure at intermediate-load conditions.