Investigation of the Combustion Kinetics Process in a High-Pressure Direct Injection Natural Gas Marine Engine

Jingrui Li, Haifeng Liu, Xinlei Liu, Ying Ye, Hu Wang, Mingfa Yao

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The detailed combustion kinetic processes of a high-pressure direct injection (HPDI) natural gas (NG) marine engine was investigated in the present work. A postprocessing code was employed to visualize the characteristic reactions that determine the combustion process. To evaluate the effect of mixture stratification on the combustion process, various NG injection timings were employed and four representative combustion periods were selected, including the timings when 1% (CA1), 5% (CA5), 10% (CA10), and 50% (CA50) of the total fuel energy are released. A higher heat release rate (HRR) was generated with a more advanced NG start of injection (SOI) timing, which, however, had limited effects on the main representative exothermic reactions (REXRs) within the high heat release (HHR) region and the dominant formation reactions of CH2O and OH, which are known as the indicators of low heat release (LHR) and HHR, respectively. Besides, for different NG SOI timing simulation, the consumption of CH4 was all dominated by reactions H + CH4 = CH3 + H2 and OH + CH4 = CH3 + H2O and the dominated REXR of the LHR region was reaction CH3 + O2 = CH3O2. Furthermore, with an advanced NG injection timing, significant changes were observed for the reaction paths of CH2, CH2O, and HCO from the premixed-combustion phase (CA10) to the mixing-controlled combustion phase (CA50). The results of the present study are able to provide a theoretical fundamental for the practical control of the HPDI NG marine engine.
Original languageEnglish (US)
JournalEnergy & Fuels
StatePublished - Mar 31 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-04-02
Acknowledgements: The present work was supported by the National Natural Science Foundation of China (Grant No. 91941102) and the High-Tech Ship Research of the Ministry of Industry and Information Technology of the People’s Republic of China (Grant No. MC-201501-D01-03).

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • General Chemical Engineering
  • Fuel Technology


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