| 王解托，刘腾，董晶瑾，刘海峰，叶映，尧命发.燃气预喷对高压直喷天然气船机的影响研究[J].内燃机工程,2018,39(5):73-79. |
| Influence of Gas Pre-Injection Strategies on Combustion and Emission Characteristics of a Pilot-Ignited High-Pressure Direct-Injection Natural Gas Marine Engine |
| DOI：10.13949/j.cnki.nrjgc.2018.05.011 |
| Key Words:natural gas pre injection strategy pilot ignition low speed engine CFD |
| Author Name | Affiliation | | WANG Jietuo, LIU Teng, DONG Jingjin, LIU Haifeng, YE Ying, YAO Mingfa | 1.State Key Laboratory of Engines， Tianjin University, Tianjin 300072, China
2.China Shipbuilding Power Engineering Institute Co., Ltd., Shanghai 200120, China |
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| Abstract:For the fuel injection system of a pilot-ignited direct-injection natural gas engine, the influence of different natural gas pre-injection strategies on the combustion and emission characteristics of the engine was studied to explore the potential of natural gas pre-injection to improve the combustion system of low speed marine engines using a single-cylinder simulation model established by a Converge software. The combustion and emission data were verified by experiments and calculated at different pre injection intervals and pre-injection ratios. Results show that the use of pre-injection strategy affects the proportion of premixed combustion in the combustion process, thus affecting the exothermic phase and isovolumetric combustion. Moreover, the pre-injection ratio has a more significant influence on the combustion process than the pre-injection interval, and the latter only affects the combustion exothermic process at a larger pre-injection ratio. In terms of emissions, the optimized pre-injection strategy can control the premixed combustion so as to achieve simultaneous improvement of NOx and fuel consumption. On the other hand, different pre-injection strategies allow different soot distributions in the cylinder. Compared with non-pre-injection solution, the use of pre-injection strategies leads to higher soot emissions. |
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