发动机起动动态过程富氧燃烧排放及其失火特性研究  

Investigation on Start Emission and Misfire Characteristics of Spark Ignition Engine Intaking Oxygen-Enriched Air

作　　者：高青[1] 刘成材[1] 金英爱[1] 马纯强[1] 张广军[1] 苏俊林[1] 

机构地区：[1]吉林大学热能工程系,长春130025

出　　处：《内燃机工程》2010年第3期7-10,16,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(50676039)

摘　　要：针对发动机选择性组分进气富氧燃烧,采取氧浓度21%-27%的富氧进气,研究点燃式发动机起动初始段瞬态过程燃烧与排放特性。试验表明：随着进气氧浓度的增加,CO、HC排放明显下降,NOx排放有所升高。在氧浓度23%-25%的低富氧程度时,对于CO、HC排放的影响相对显著,随着富氧程度的进一步增加,该影响作用明显减弱。尽管富氧起动带来一定程度的NOx排放增加,但是起动过程的NOx排放仍然处于较低水平。缸内燃烧探测可知,合适的富氧氛围有利于火焰传播和扩散,明显减少失火现象,失火率呈线性降低趋势,起动燃烧稳定性明显增强。The dynamic combustion and emission characteristics of a SI engine fed with intake air of various oxygen content （21%～27 %） in start period were investigated. Results show that with the increase of oxygen content in the intake air, CO, HC emissions decrease obviously, but NOx emission rises slightly. The effect to reduce the CO, HC emissions is comparatively best for the lower portion of the range （oxygen content 23%～25%）, if exceeding 25% it gets evidently diminished. Although the oxygen-enriched intake air causes a certain increase of the NOx emission, it is still at acceptable low level, due to the engine is just starting. It is known by optical sensor detection in cylinder that the appropriate oxygen-enriched atmosphere is advantageous to the flame spread and diffusion, making the engine combustion stable in start period, con- sequently the misfire rate drops sharply.

关 键 词：内燃机 富氧 燃烧 排放 失火 起动 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]