An Investigation of the Influence of Gas Injection Rate Shape on High-Pressure Direct-Injection Natural Gas Marine Engines

Jingrui Li, Jietuo Wang, Teng Liu, Jingjin Dong, Bo Liu, Chaohui Wu, Ying Ye, Hu Wang and Haifeng Liu
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Jingrui Li: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Jietuo Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Teng Liu: China Ship Power Research Institute Co., Ltd., Shanghai 200120, China
Jingjin Dong: China Ship Power Research Institute Co., Ltd., Shanghai 200120, China
Bo Liu: China Ship Power Research Institute Co., Ltd., Shanghai 200120, China
Chaohui Wu: China Ship Power Research Institute Co., Ltd., Shanghai 200120, China
Ying Ye: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Hu Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Haifeng Liu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

Energies, 2019, vol. 12, issue 13, 1-18

Abstract: High-pressure direct-injection (HPDI) natural gas marine engines are widely used because of their higher thermal efficiency and lower emissions. The effects of different injection rate shapes on the combustion and emission characteristics were studied to explore the appropriate gas injection rate shapes for a low-speed HPDI natural gas marine engine. A single-cylinder model was established and the CFD model was validated against experimental data from the literature; then, the combustion and emission characteristics of five different injection rate shapes were analyzed. The results showed that the peak values of in-cylinder pressure and heat release rate profiles of the triangle shape were highest due to the highest maximum injection rate, which occurred in a phase close to the top dead center. The shorter combustion duration of the triangle shape led to higher indicated mean effective pressure (IMEP) and NOx emissions compared with other shapes. The higher initial injection rates of the rectangle and slope shapes had a negative effect on the ignition delay periods of pilot fuel, which resulted in lower in-cylinder temperature and NOx emissions. However, due to the lower in-cylinder temperature, the engine power output was also lower. Otherwise, soot, unburned hydrocarbon (UHC), and CO emissions and indicated specific fuel consumption (ISFC) increased for both rectangle and slope shapes. The trapezoid and wedge shapes achieved a good balance between fuel consumption and emissions.

Keywords: low-speed engine; natural gas; high-pressure direct injection (HPDI); injection rate shape; CFD (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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