| 龚世华,车胜楠,刘宗宽,等.湍流射流点火甲醇发动机燃烧特性及预燃室喷射策略研究[J].内燃机工程,2023,44(1):68-75. |
| 湍流射流点火甲醇发动机燃烧特性及预燃室喷射策略研究 |
| Investigation on the Combustion Characteristics and Pre-Chamber Injection Strategy of the Methanol Engine by Turbulent Jet Ignition |
| DOI：10.13949/j.cnki.nrjgc.2023.01.009 |
| 关键词:湍流射流点火 甲醇发动机 预燃室 燃烧特性 |
| Key Words:turbulent jet ignition（TJI） methanol engine pre-chamber combustion characteristic |
| 基金项目:国家自然科学基金重大研究计划重点项目（91641203） |
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| 摘要:基于一台四冲程单缸发动机开展湍流射流点火甲醇发动机的性能表现和燃烧特性研究。结果表明，湍流射流点火（turbulent jet ignition， TJI）燃烧模式放热率（heat release rate， HRR）曲线呈现“双峰”现象，放热率峰值明显高于火花塞点火（spark ignition， SI）模式，且具有更短的燃烧持续期。过量空气系数λ=1.0时，预燃室内不喷射甲醇的被动式TJI模式的平均指示压力略低于SI模式，指示燃油消耗率略高于SI模式。对于主动式TJI燃烧模式，λ=1.5，预燃室甲醇喷射时刻为压缩上止点前180°曲轴转角，喷射脉宽保持在350 μs~600 μs之间时，TJI甲醇发动机燃烧稳定性较好，同时动力性与经济性均有所提升。 |
| Abstract:The engine performances and combustion characteristics of a turbulent jet ignition（TJI） methanol engine were investigated based on a four-stroke single-cylinder engine. The results show that， the heat release rate （HRR） of TJI combustion mode shows the “double-peak” phenomenon， and the HRR peak is higher than that of spark ignition（SI） mode. Meanwhile， the combustion duration of TJI combustion mode is shorter. When the excess air coefficient λ is 1.0， the TJI combustion mode with passive pre-chamber that the methanol was fueled in the pre-chamber has a lower indicated mean effective pressure（IMEP） in comparison to SI mode， and the indicated specific fuel consumption （ISFC） of TJI combustion mode with passive pre-chamber is slightly higher than that of SI mode. For the TJI combustion mode with active pre-chamber， when the excess air coefficient λ is 1.5， the TJI methanol engine has a superior combustion stability when injection timing of pre-chamber methanol is -180° in crank angle and the injection pulse width is 350 μs~600 μs. Meanwhile， both the power performance and fuel economy are improved. |
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