混氢改善汽油机低怠速性能研究  

Effect of Hydrogen Addition on Improving Low Idle Speed Performance of SI Engine

作　　者：汪硕峰[1] 纪常伟[1] 焦磊 张旻玥[1] 张擘[1] 黄霄楠[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124 [2]李斯特测试设备上海有限公司,北京100027

出　　处：《农业机械学报》2012年第5期22-26,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50976005)

摘　　要：在一台加装了电控氢气喷射系统的四缸汽油机上,试验研究了混氢对发动机低怠速性能的影响。在怠速转速不变、维持进气混合气处于当量比的条件下,在0～6%的范围内逐渐增加氢气在总进气中的体积分数,测试了发动机转速分别为800、700、600 r/min时的低怠速性能。试验结果表明,纯汽油机怠速为800 r/min时,发动机稳定运行的燃料能量流量Ef为30.8 MJ/h,而当混氢分数增加至6.0%、怠速转速降至600 r/min时,Ef降低至18.6 MJ/h;随进气混氢体积分数的提高,发动机低怠速时的燃烧持续期缩短,HC、CO及NOx排放量降低,循环变动也减小。可见,进气掺氢可有效改善发动机的低怠速性能。An experiment was carried out on a four-cylinder spark-ignited（SI） gasoline engine to investigate the effect of hydrogen addition on the engine performance at low idle speed conditions.The engine was run at three idle speeds of 800 r/min,700 r/min and 600 r/min.At the specified idle speed and stoichiometric conditions,the hydrogen volumetric fraction in the total intake was gradually increased from 0 to about 6%.The experimental results showed that the engine fuel energy flow rate was reduced from 30.8 MJ/h at the idle speed of 800 r/min and a hydrogen volumetric fraction in the intake of 0 to 18.6 MJ/h at the idle speed of 600 r/min and a hydrogen volumetric fraction in the intake of 6.0%.For different idle speeds,the engine combustion duration was shortened,cyclic variation was eased and HC,CO and NOx emissions were decreased with the increase of hydrogen volumetric fraction in the intake.All in all,the addition of hydrogen was effective for enhancing the engine performance at low idle speed conditions.

关 键 词：汽油机 混氢 怠速 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]