| CNG缸内直喷发动机稀薄燃烧火焰传播过程影响因素的研究 |
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| 引用本文： | 林学东,黄丫,袁方恩,朱行安,张斌.CNG缸内直喷发动机稀薄燃烧火焰传播过程影响因素的研究[J].汽车工程,2011,33(10). |
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| 作者姓名： | 林学东 黄丫 袁方恩 朱行安 张斌 |
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| 作者单位： | 吉林大学,汽车仿真与控制国家重点实验室,长春130025 |
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| 摘 要： | 在试验用单缸光学发动机上,采用可视化技术研究缸内CNG直喷稀薄燃烧过程中喷射方式和点火方式对火焰传播过程的影响,同时采用双喷油器、双火花塞,分析研究喷射时刻、喷射位置和点火时刻等参数对稀薄燃烧特性和NOx排放特性的影响。结果表明,在稀薄燃烧过程中,火花塞附近的混合气浓度梯度对火焰传播和燃烧稳定性影响很大;混合气浓度梯度越大,循环变动越小,燃烧更稳定,但NOx排放量也增加。可见,控制稀薄燃烧过程的关键是控制火花塞附近的混合气浓度梯度,而它又直接影响NOx的生成。
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| 关 键 词： | CNG直喷发动机 稀薄燃烧 火焰传播 NOx排放 |
A Study on the Factors Affecting the Process of Flame Propagation with Lean Burn in CNG DI Engine |
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| Lin Xuedong,Huang Ya,Yuan Fang'en,Zhu Xing'an,Zhang Bin.A Study on the Factors Affecting the Process of Flame Propagation with Lean Burn in CNG DI Engine[J].Automotive Engineering,2011,33(10). |
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| Authors: | Lin Xuedong Huang Ya Yuan Fang'en Zhu Xing'an Zhang Bin |
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| Institution: | Lin Xuedong,Huang Ya,Yuan Fang'en,Zhu Xing'an & Zhang Bin Jilin University,State Key Laboratory of Automotive Simulation and Control,Changchun 130025 |
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| Abstract: | The effects of injection and ignition modes on flame propagation in the lean burn process of in-cylinder CNG direct injection are studied on an experimental single-cylinder optical engine,and the effects of injection timing,injection location and ignition timing on its lean burn characteristics and NOx emission are also investigated by adopting dual injectors and dual spark plugs.The results show that in lean burn process the concentration gradient of mixture around spark plug has great effects on frame pro... |
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| Keywords: | CNG DI engine lean burn flame propagation NOx emission |
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