混氢改善汽油机稀燃性能的试验研究  

EXPERIMENTAL STUDY ON IMPROVING GASOLINE ENGINE LEAN OPERATING PERFORMANCE WITH HYDROGEN ADDITION

作　　者：汪硕峰[1] 纪常伟[1] 张擘[1] 朱永明[1] 张旻玥[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：《工程热物理学报》2010年第12期2145-2148,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50976005)

摘　　要：针对汽油机稀燃条件下循环变动大,燃料燃烧不充分的问题,本文在一台加装了电控氢气喷射系统的四缸汽油机上就混氢对改善汽油机稀燃条件下燃烧与排放性能的作用进行了试验研究。在发动机1400r/min,进气道绝对压力为61.5 kPa的条件下,就1%与3%两种进气混氢体积分数对稀燃汽油机燃烧与排放特性的影响进行了研究。试验结果表明,稀燃时发动机制动热效率随混氢分数增加而提高;滞燃期与速燃期随混氢分数增加而缩短;发动机稀燃极限所对应的过量空气系数由原机的1.45提高至混氢1%与3%时的1.55和1.96。混氢后发动机HC与CO排放降低,但NO_x排放有所升高。In view of the high cyclic variation and partial combustion of gasoline-fueled spark ignition （SI） engines under lean conditions, this paper investigated the effect of hydrogen addition to a gasoline-fueled SI engine on improving its lean combustion and emissions performance. The experiment was performed on a modified four-cylinder SI engine equipped with an electronically controlled hydrogen injection system. The engine was operated at 1400 r/rain, and a manifold absolute pressure （MAP） of 61.5 kPa. Two hydrogen volume fractions in the intake of 1% and 3% were selected to study the effect of hydrogen addition on performance of a lean burn gasoline engine. The test results showed that, at lean conditions, the engine brake thermal efficiency was improved, and flame development and propagation periods are shortened with the increase of hydrogen addition. Moreover, the correlated excess air ratio for the lean operating limit increased from 1.45 of the original engine to 1.55 and 1.96 of the 1% and 3% hydrogen-enriched engines, respectively. HC and CO emissions were decreased, whereas NOx were increased after hydrogen enrichment.

关 键 词：氢气 汽油 燃烧 稀燃极限 排放 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]