掺混标准氢氧气对汽油机性能的影响  

Effect of Standard Hydroxygen Addition on the Performance of a Gasoline Engine

作　　者：纪常伟[1] 杨金鑫[1] 汪硕峰[1] 王华超[1] 张擘[1] 周小龙[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《北京工业大学学报》2013年第9期1378-1383,共6页Journal of Beijing University of Technology

基　　金：北京市自然科学基金资助项目(3122006);北京市教委科技计划重点项目(KZ201210005002);教育部博士点基金资助项目(20111103110010);2012年学科与研究生教育-创新人才培养计划-博士生创新基金资助项目(YB201208)

摘　　要：针对汽油机部分负荷条件下热效率低和有害排放高的问题,笔者在一台加装了电控氢、氧气喷射系统的四缸汽油机上研究了掺混标准氢氧气对汽油机燃烧与排放特性的影响.标准氢氧气定义为氢气与氧气物质的量比为2∶1的氢氧气.试验时,通过调整氢气和氧气喷嘴的喷射脉宽,使标准氢氧气占进气的体积分数(α2H2/O2)由0分别增加至2%和4%,并减少汽油的喷射脉宽,使混合气的过量空气系数由1.00增加至1.50.结果表明:掺入标准氢氧气能改善汽油机经济性,发动机比燃料能量消耗率最低值由原机的12.63 MJ/kW·h分别降低至α2H2/O2为2%和4%时的12.27 MJ/kW·h和12.11 MJ/kW·h;此外,掺入标准氢氧气后,汽油机滞燃期及快速燃烧持续期缩短,最大压力升高率提高,HC及CO排放降低,但NO x排放明显增加.The gasoline engines usually encounter the dropped thermal efficiency and adversely increased toxic emissions at part load conditions. This paper investigated the effect of standard hydroxygen addition on the performance of a gasoline engine. The standard hydroxygen is defined as the hydroxygen with a hydrogen-to-oxygen mole ratio of 2： 1. The experiment was carried out on a four cylinder gasoline engine equipped with an electronically controlled hydrogen and oxygen injection system. During the experiment, the volume fraction of the standard hydroxygen in the total intake was raised from 0 to 2% and 4% by adjusting the injection durations of hydrogen and oxygen, respectively. The gasoline injection duration was reduced to enable the global excess air ratio of in-cylinder charge to increase from 1.00 to 1.50. The test results showed that the addition of standard hydroxygen availed improving the engine fuel economy. The lowest brake specific energy consumption rate was decreased from 12.63 MJ/kW·h to 12.27 MJ/kW · h and 12. 11 MJ/kW.h of the 2% and 4% standard hydroxygen-blended gasoline engines, respectively. Moreover, it was also found that the flame development and propagation periods were shortened, the peak cylinder pressure rise rate was enhanced, HC and CO emissions were reduced whereas NOx emissions were increased after the standard hydroxygen addition.

关 键 词：氢气 氧气 汽油机 燃烧 排放 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]