混氢体积分数对汽油机性能影响的试验研究  

Experimental Study on Effect of Hydrogen Addition Fraction on Performance of SI Gasoline Engine

作　　者：汪硕峰[1] 纪常伟[1] 闫皓[1] 张旻玥[1] 刘洋[1] 张擘[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：《内燃机工程》2011年第1期43-48,共6页Chinese Internal Combustion Engine Engineering

基　　金：北京市自然科学基金项目(3082004);北京市教育委员会科研基地建设项目(0050005366901)

摘　　要：在一台加装了电控氢气喷射系统的发动机上就过量空气系数为1.1时进气混氢体积分数对发动机性能的影响进行了试验研究。在发动机转速为1 400 r/min的条件下,调整了氢气的喷射脉宽,使氢气占进气的体积分数依次为01、%、3%4、.5%和6%。试验结果表明:混氢后发动机制动热效率升高,在混氢体积分数为6%时,发动机制动热效率比纯汽油机时平均提高14.53%;滞燃期与快速燃烧持续期缩短;缸压峰值增加,缸压峰值位置所对应的曲轴转角提前;发动机循环变动降低。在混氢体积分数较小时,CO排放随混氢比的增加而减少,但混氢体积分数为6%时的发动机CO排放有所升高;混氢后发动机HC排放减少,但NOx排放有所增加。Investigation on effects of hydrogen addition fraction on combustion and emission characteristics of SI gasoline engine was performed on a modified SI engine equipped with an electron-controlled hydrogen port-injection system, under the conditions of the excess air ratio of 1.1 and engine speed 1 400 r/min. The hydrogen volumetric fraction in the total intake air was gradually increased from 0 up to 6% by adding hydrogen injection pulse width. The experiment results demonstrate that the engine brake thermal efficiency （BTE） is improved by hydrogen enrichment. And when the hydrogen volumetric fraction reaches 6%, the BTE increases by 14.53%on average, compared to fueled with pure gasoline. The ignition delay and fast burning duration shorten, the peak cylinder pressure rises and its relevant crank angle advances, while the cyclic variation in peak cylinder pressure decreases with increasing of hydrogen enrichment level. At low hydrogen addition fraction, CO emission decreases with the hydrogen enrichment level increasing, but as hydrogen volumetric fraction reaches 6%, CO emission increases again. HC emission reduces and NOx emis- sion increases with the hydrogen addition.

关 键 词：内燃机 汽油机 氢气 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]