Numerical study of effects of reformed exhaust gas recirculation (REGR) on dimethyl ether HCCI combustion

The effects of reformed exhaust gas recirculation (REGR) on combustion and emissions of dimethyl ether (DME) homogeneous charge compression ignition (HCCI) engines are studied by multi-dimensional CFD coupled with chemical kinetic model. The results show that REGR combing EGR and DME reformed gases...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-05, Vol.39 (15), p.8106-8117
Main Authors: Zheng, Zhaolei, Liu, Chuntao, Zhang, Xiaoyu
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Carbon monoxide
Combustion
Compressing
Dimethyl ether
DME
Emissions
Energy
Engines
Exact sciences and technology
Exhaust
Fuels
HCCI
Hydrogen
Hydrogen-based energy
Ignition
REGR
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Summary:The effects of reformed exhaust gas recirculation (REGR) on combustion and emissions of dimethyl ether (DME) homogeneous charge compression ignition (HCCI) engines are studied by multi-dimensional CFD coupled with chemical kinetic model. The results show that REGR combing EGR and DME reformed gases (DRG) improves combustion and emissions. REGR can delay ignition time by both EGR and DRG, and makes main combustion closer to top dead center (TDC), which is beneficial to reducing compression negative work and broadening load range of HCCI engines. The interaction of DRG and EGR helps avoid too high pressure rise rate or low power performance when being applied independent of each other. HC, CO and NOx emissions can be controlled simultaneously by REGR. Both advantages of DRG and EGR are used to decrease the emissions of HCCI engines by REGR, while the disadvantages of high emissions are alleviated when one of them is applied. •A new detailed chemical reaction kinetics mechanism of DME is built.•Both zero-dimensional and multi-dimensional combustion models are built.•Different influences of CO and H2 on DME HCCI combustion are analyzed.•REGR improves the combustion and emissions of DME HCCI engines.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.03.030