Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine
An experimental study regarding methanol–diesel dual-fuel (DF) engines was conducted on a modified engine to explore the effects of pilot injection timing and period on the two-stage combustion process caused by the pilot injection strategy. In this study, the two-stage combustion process was determ...
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MDPI AG
2022-05-01
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| Online Access: | https://www.mdpi.com/1996-1073/15/10/3578 |
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| author | Ao Zhou Hui Jin Wenhan Cao Ming Pang Yangyang Li Chao Zhu |
| author_facet | Ao Zhou Hui Jin Wenhan Cao Ming Pang Yangyang Li Chao Zhu |
| author_sort | Ao Zhou |
| collection | DOAJ |
| description | An experimental study regarding methanol–diesel dual-fuel (DF) engines was conducted on a modified engine to explore the effects of pilot injection timing and period on the two-stage combustion process caused by the pilot injection strategy. In this study, the two-stage combustion process was determined according to the first two peaks of the second derivative of an in-cylinder pressure (<i>d</i><sup>2</sup><i>p</i>/<i>dφ</i><sup>2</sup>) curve. The results show that the peak pressure rise rate (<i>PRR</i>) tended to decrease with advancing pilot injection timing at a high co-combustion ratio (<i>CCR</i>), which reduced combustion noise. The start of the combustion of the main injection diesel (SOC2) could be advanced by increasing the pilot injection period or advancing pilot injection timing at a 42% CCR. At an 18% CCR, the pilot injection timing and period had no significant effect on SOC2. With the advancement of pilot injection timing, the start of the combustion of pilot injection diesel (SOC1) advanced, and generally, the coefficient of variation of the <i>PRR</i> (<i>COV<sub>PRR</sub></i>) of the two-stage combustion process increased first and then decreased. However, with the increase in the pilot injection period, SOC1 almost always remained constant and the <i>COV<sub>PRR</sub></i> of the two-stage combustion process generally increased. |
| first_indexed | 2024-03-10T03:58:21Z |
| format | Article |
| id | doaj.art-bf571ff9798a4978b47d6e1cf091dced |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T03:58:21Z |
| publishDate | 2022-05-01 |
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| record_format | Article |
| series | Energies |
| spelling | doaj.art-bf571ff9798a4978b47d6e1cf091dced2023-11-23T10:50:06ZengMDPI AGEnergies1996-10732022-05-011510357810.3390/en15103578Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel EngineAo Zhou0Hui Jin1Wenhan Cao2Ming Pang3Yangyang Li4Chao Zhu5School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Automotive Engineering, Lanzhou Institute of Technology, Lanzhou 730050, ChinaSchool of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaShaanxi Key Laboratory of Development and Application of New Transportation Energy, Chang’an University, Xi’an 710064, ChinaState Grid Shaanxi Electric Power Research Institute, Xi’an 710100, ChinaAn experimental study regarding methanol–diesel dual-fuel (DF) engines was conducted on a modified engine to explore the effects of pilot injection timing and period on the two-stage combustion process caused by the pilot injection strategy. In this study, the two-stage combustion process was determined according to the first two peaks of the second derivative of an in-cylinder pressure (<i>d</i><sup>2</sup><i>p</i>/<i>dφ</i><sup>2</sup>) curve. The results show that the peak pressure rise rate (<i>PRR</i>) tended to decrease with advancing pilot injection timing at a high co-combustion ratio (<i>CCR</i>), which reduced combustion noise. The start of the combustion of the main injection diesel (SOC2) could be advanced by increasing the pilot injection period or advancing pilot injection timing at a 42% CCR. At an 18% CCR, the pilot injection timing and period had no significant effect on SOC2. With the advancement of pilot injection timing, the start of the combustion of pilot injection diesel (SOC1) advanced, and generally, the coefficient of variation of the <i>PRR</i> (<i>COV<sub>PRR</sub></i>) of the two-stage combustion process increased first and then decreased. However, with the increase in the pilot injection period, SOC1 almost always remained constant and the <i>COV<sub>PRR</sub></i> of the two-stage combustion process generally increased.https://www.mdpi.com/1996-1073/15/10/3578methanol–diesel DFpilot injection timingpilot injection periodcombustion characteristicSOC1SOC2 |
| spellingShingle | Ao Zhou Hui Jin Wenhan Cao Ming Pang Yangyang Li Chao Zhu Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine Energies methanol–diesel DF pilot injection timing pilot injection period combustion characteristic SOC1 SOC2 |
| title | Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine |
| title_full | Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine |
| title_fullStr | Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine |
| title_full_unstemmed | Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine |
| title_short | Influence of Pilot Injection on Combustion Characteristic of Methanol–Diesel Dual-Fuel Engine |
| title_sort | influence of pilot injection on combustion characteristic of methanol diesel dual fuel engine |
| topic | methanol–diesel DF pilot injection timing pilot injection period combustion characteristic SOC1 SOC2 |
| url | https://www.mdpi.com/1996-1073/15/10/3578 |
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