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High Density-Low Temperature Combustion in Diesel Engine Based on Technologies of Variable Boost Pressure and Intake Valve Timing
Technical Paper
2009-01-1911
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A concept of high density-low temperature combustion (HD-LTC) is put forward in this paper, showing potential of its high thermal efficiency and very low engine-out emissions by engine experimental and CFD modeling study. A single cylinder test engine has been built-up equipped with mechanisms of variable boost pressure and intake valve closing timing (IVCT). By delaying IVCT and raising boost pressure to certain values according to engine loads, the in-cylinder charge density is regulated much higher than in conventional engines. It is found that the high charge density can play the role of rising of heat capacity as exhaust gas recirculation (EGR) does. Thereby low temperature combustion is realized with less EGR (about 18~19% oxygen concentration) to achieve very low NOx and soot emissions, which is extremely important at high and full loads. In addition, high density of charge promotes fuel air mixing rate so as to promote burning rate, especially, in the later phase of engine combustion, which leads to higher efficiency. However, effects of charge density on NOx emissions are complex due to its two-fold effects on combustion process: one is increasing charge heat capacity and inhibiting temperature rising, another is promoting mixing rate and burning rate and then increasing temperature rate.
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Authors
- Wanhua Su - State Key Laboratory of Engines, Tianjin University
- Yingying Lu - State Key Laboratory of Engines, Tianjin University
- Wenbin Yu - State Key Laboratory of Engines, Tianjin University
- Changqing Wang - State Key Laboratory of Engines, Tianjin University
- Yiqiang Pei - State Key Laboratory of Engines, Tianjin University
- Yongliang Sun - Technical Center, Weichai Power
- Yunqiang Li - Technical Center, Weichai Power
- Zhongfu Yu - Technical Center, Weichai Power
- Jinfeng Wang - Technical Center, Weichai Power
Topic
Citation
Su, W., Lu, Y., Yu, W., Wang, C. et al., "High Density-Low Temperature Combustion in Diesel Engine Based on Technologies of Variable Boost Pressure and Intake Valve Timing," SAE Technical Paper 2009-01-1911, 2009, https://doi.org/10.4271/2009-01-1911.Also In
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