| 刘学龙，刘正先,张雨生,刘丰年，周磊，卫海桥.活塞式航空煤油发动机性能优化及爆震抑制研究[J].内燃机工程,2021,42(6):62-69. |
| Study on Performance Optimization and Knock Suppression of Piston Kerosene Engine |
| DOI：10.13949/j.cnki.nrjgc.2021.06.009 |
| Key Words:kerosene air-assisted injection piston engine knock suppression |
| Author Name | Affiliation | | LIU Xuelong, LIU Zhengxian, ZHANG Yusheng, LIU Fengnian, ZHOU Lei, WEI Haiqiao | 1.School of Mechanical Engineering, Tianjin University, Tianjin 300072, China
2.CATARC(Tianjin) Automotive Engineering Research Institute Co., Ltd., Tianjin 300300, China
3.State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China |
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| Abstract:Based on a single-cylinder thermodynamic engine with variable compression ratio, a self-developed air-assisted injection system was used to carry out an experimental research on the performance optimization and knock suppression of a piston aviation kerosene engine under full load conditions. The effects of double ignition, reduction of compression ratio and CO2-assisted injection on the performance and knock suppression of aviation kerosene engines were investigated. The results show that the use of double ignition can effectively increase the flame propagation rate of aviation kerosene, improve the combustion phase, reduce cyclic fluctuation, and have the effect of suppressing knocking. By reducing the compression ratio, knocking suppression is effectively achieved and it can solve the problem that the aviation kerosene engine can only run in a small load range at high compression ratio. When the compression ratio is reduced to 6, the engine can run on full load, with good power performance and economy, and is not prone to knock. When CO2-assisted aviation kerosene injection is used, with the increase of CO2 pulse width, the engine performance and economy will decrease at the same ignition timing. However, due to the effect of CO2 in suppressing knocking, the maximum braking torque ignition timing can be advanced to 14° before top dead center, which advances the combustion phase and improves engine combustion efficiency. |
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