Effect of the HPDI and PPCI Combustion Modes of Direct-Injection Natural Gas Engine on Combustion and Emissions

Shouying Jin, Jinze Li, Longfei Deng and Binyang Wu
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Shouying Jin: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Jinze Li: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Longfei Deng: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Binyang Wu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

Energies, 2021, vol. 14, issue 7, 1-17

Abstract: Natural gas (NG) engines have very broad application prospects. The pilot-ignited NG diesel engine can be organized into two combustion modes according to the sequence of oil and gas injection: (1) High-pressure direct injection, where NG is mainly diffused combustion; and (2) partially premixed compression ignition, where NG is mainly premixed combustion. In this study, we used CONVERGE to explore the influence of the NG injection timing on the distribution of the mixture equivalence ratio, ignition characteristics, thermal efficiency, emission, and combustion reaction rate under the two combustion modes. We also used a multi-step soot model to analyze the particle mass and quantity. We showed herein that the NG injection timing significantly affects the mixture distribution in the cylinder, thereby consequently affecting the combustion process. Both very early and very late injection times were not conducive to NG combustion. In addition, the mass, quantity, and diameter of the soot produced by diffusion combustion were larger than those produced with premixed combustion.

Keywords: pilot-ignited natural gas diesel engine (PINGD); direct injection of natural gas; high-pressure direct injection (HPDI); partially premixed compression ignition (PPCI); particulate emissions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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