为了研究稀燃工况下天然气发动机燃烧不稳定性的变化规律,在 25%负荷、转速为 1 000 r/min工况下针对 6组不同过量空气系数λ进行试验,采用统计分析方法研究了最大爆压、最大爆压对应的曲轴转角、指示平均有效压力(IMEP)的频率分布规律,并分析了各燃烧特征参数之间的关联性.结果表明:随着 λ 增大,天然气发动机燃烧不稳定性增强;最大爆压、最大爆压对应曲轴转角的频率分布范围逐渐增大,IMEP频率分布范围先减小后增大,循环间差异性均增加;各燃烧特征参数的关系图中,点的分布范围均增大,且存在线性关系,当混合气浓度过稀时线性关系减弱.稀燃工况下天然气发动机产生燃烧不稳定分析,为天然气发动机稀燃稳定性优化和控制提供了理论依据.
To study the variation law of combustion instability of natural gas engine with lean-burn condition,experiments were carried out on a natural gas engine with six different excess air coefficients with the condition of 25%load and 1 000 r/min.The frequency distributions of pmax,θpmax and IMEP were studied by statistical analysis method,and the correlation between each combustion characteristic parameter was also analyzed.Results showed that with the increase of λ,the combustion instability of natural gas engine enhanced and the frequency distribution ranges of pmax and θpmax increased gradually,while the frequency distribution range of IMEP initially decreased and then increased,and the difference between combustion cycles increased.In each correlation diagram of combustion characteristic parameters,the distribution range of points becme wider,where existed a linear relationship.When the mixture concentration became thinner,the linear relationship weakened.The reasons for the combustion insta-bility of natural gas engine with lean-burn conditions were analyzed,providing a theoretical basis for the optimiza-tion and control of lean-burn combustion stability of natural gas engine.
丁顺良;耿海棠;高建设;陶征;宋恩哲
郑州大学 机械与动力工程学院,河南 郑州 450001哈尔滨工程大学 动力与能源工程学院,黑龙江 哈尔滨 150001
能源与动力
天然气发动机;燃烧不稳定性;过量空气系数;统计分析
natural gas engine;combustion instability;excess air coefficient;statistical analysis
《郑州大学学报（工学版）》 2024 (005)
45-51 / 7
国家自然科学基金资助项目(51906225);船舶动力工程技术交通运输行业重点实验室(武汉理工大学)开放基金项目(KLMPET2021-05);教育部"春晖计划"合作科研项目(HZKY20220281)
10.13705/j.issn.1671-6833.2024.05.014
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