Effect of diglyme on diesel engine combustion and un/regulated emission

ABSTRACT

The influence of diglyme on diesel engine combustion and emission, including regulated and unregulated emissions, was carried out at various engine modes, in which ultra-low sulfur diesel and diglyme were employed, and diesel-diglyme blends were designed containing specific mass oxygen content varied from 2% to 20% corresponding to 5% to 53% diglyme blended by volume. With the addition of diglyme, actual air/fuel ratio decreased in general, combustion initiated earlier by 5.3% to 14.6% at tested modes but weighted center postponed with short ignition delay and combustion duration, meanwhile maximum in-cylinder combustion temperature reduced by 3 to 30°C, which affected emissions significantly.Consequently, the optimized PM-NOx trade-off was obtained with particulate and NOx decreased simultaneously, but formaldehyde and acetaldehyde increased by the varation from 3% to 190% with the addition of diglyme. Sulfur dioxide emission was much lower with ultra-low sulfur diesel compared that with other fuels including conventional diesel, about one order of magnitude smaller, and diglyme could bring further reduction by maximum of 62.5%. In addition, the oxygen in diglyme promoted CO oxidation and NO₂ conversion from NO, leading to an increased NO₂/CO ratio by even to 375.9%.

KEYWORDS:

• Combustion
• regulated emission
• ultra-low sulfur diesel
• diglyme
• unregulated emission

Acknowledgements

The authors would like to thank the Hong Kong Polytechnic University (Project Number GU-319), for supporting this project.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplemental material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/15567036.2024.2387234

Additional information

Funding

The work was supported by the Hong Kong Polytechnic University [Project Number GU-319].

Notes on contributors

Yage Di

Yage Di Ph. D, is working as assistant professor in school of mechanical and automobile engineering, Shanghai University of Engineering Science. He has worked on engine R&D more than 10 years in consultancy and OEM, and published more than 10 research paper in I.C.E, and lead this research work and manuscript drafting.

Zhengxiang Zeng

Zhengxiang Zeng is pursuing a master’s degree in the field of engine, in school of mechanical and automobile engineering, Shanghai University of Engineering Science. His research interest is engine combustion development and supports the combustion data process for this paper.

Jie Lu

Jie Lu is pursuing a master’s degree in the field of engine, school of mechanical and automobile engineering, Shanghai University of Engineering Science. His research interest is dedicated hybrid engine development and supports the combustion data analysis for this paper.

Zhaoyang Hao

Zhaoyang Hao is pursuing a master’s degree in the field of engine, school of mechanical and automobile engineering, Shanghai University of Engineering Science. His research interest is emission control and supports the emission data process for this paper.

Jian Zhou

Jian Zhou is pursuing a master’s degree in the field of in powertrain, in school of mechanical and automobile engineering, Shanghai University of Engineering Science. His research interest is decarbonization and emission control, and supports the plotting Refinish for this paper.

Jinbao Zheng

Jinbao Zheng Ph. D, is working as an assistant professor in school of mechanical and automobile engineering, Shanghai University of Engineering Science. His research interest is engine combustion and spray and supports this paper in combustion figure plotting.

Xuelong Miao

Xuelong Miao Ph. D team head, is working as professor in school of mechanical and automobile engineering, Shanghai University of Engineering Science. His research interest is engine combustion and spray and guides this research.