天然气发动机燃烧循环变动特征参数分析研究  

Study on Characteristic Parameters of Cycle-to-cycle Combustion Variations in Natural Gas Engine

作　　者：姚宝峰[1] 李国岫[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《内燃机工程》2007年第4期1-5,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(50406003);国家"十五"科技攻关计划课题资助(2005BA413B24)

摘　　要：通过天然气发动机燃烧循环变动试验,获得了不同工况下天然气发动机缸内压力时间序列。以此为基础,分析了不同燃烧循环变动程度工况下,天然气发动机燃烧循环变动特征参数间的相关性。结果显示,缸内峰值压力pmax与平均指示压力pi有稳定的线性关系。同时,在平均指示压力循环变动系数小于9%的工况下,分别利用pmax与pi进行天然气发动机燃烧循环变动影响因素研究,得到了类似的趋势。最后,通过对缸内压力时间序列进行相空间重构,进一步分析了利用pmax准确表征天然气发动机燃烧循环变动的条件。In-cylinder pressure time series of a lean burn SI natural gas engine were measured at various operating conditions. Based on the measured results, the correlations of some characteristic parameters of cycleto-cycle combustion variations （CCV） at operating conditions with different CCV were discussed. The result shows that a good and stable linear correlation exists between in-cylinder peak pressure （Pmax） and indicated mean effective pressure （pi）. And the same trend was found when CCV coefficient of pi was below 9 %. Moreover, the mechanism of using Pmax as an indicator of cycle-to-cycle combustion variations of natural gas engine was discussed through phase space reconstructed for in-cylinder pressure time series.

关 键 词：内燃机 天然气发动机 循环变动 特征参数 相关性 相空间重构 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]