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Effect of EGR on HCCI Combustion fuelled with Dimethyl Ether (DME) and Methanol Dual-Fuels
Technical Paper
2005-01-3730
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effects of cooled EGR on combustion and emission characteristics in HCCI operation region was investigated on a single-cylinder diesel engine, which is fitted with port injection of DME and methanol. The results indicate that EGR rate can enlarge controlled HCCI operating region, but it has little effect on the maximum load of HCCI engine fuelled with DME/methanol dual-fuels. With the increase of EGR rate, the main combustion ignition timing (MCIT) delays, the main combustion duration (MCD) prolongs, and the peak cylinder pressure and the peak rate of heat release decreases. Compared with EGR, DME percentage has an opposite effect on HCCI combustion characteristics. The increase of indicated thermal efficiency is a combined effect of EGR rate and DME percentage. Both HC and CO emissions ascend with EGR rate increasing, and decrease with DME percentage increasing. In normal combustion, NOX emissions are near zero. The integrated results suggest that, in normal combustion region, adopting large DME percentage and high EGR rate can attain an optimal HCCI combustion.
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Authors
- Mingfa Yao - State Key Laboratory of Engines, Tianjin University
- Zheng Chen - State Key Laboratory of Engines, Tianjin University
- Zunqing Zheng - State Key Laboratory of Engines, Tianjin University
- Bo Zhang - State Key Laboratory of Engines, Tianjin University
- Yuan Xing - State Key Laboratory of Engines, Tianjin University
Topic
Citation
Yao, M., Chen, Z., Zheng, Z., Zhang, B. et al., "Effect of EGR on HCCI Combustion fuelled with Dimethyl Ether (DME) and Methanol Dual-Fuels," SAE Technical Paper 2005-01-3730, 2005, https://doi.org/10.4271/2005-01-3730.Also In
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