【作者】 刘海峰；

【导师】 黄锦成；

【作者基本信息】 广西大学 ， 动力机械及工程， 2006， 硕士

【摘要】 能源匮乏和环境污染是当今世界各国所共同面临的两大难题。均质压燃(HCCI)燃烧技术以其低氮氧化物、低微粒排放和高热效率的优点而引起世界各国的广泛关注。控制着火时刻和燃烧反应速率以及扩展运行工况范围是发动机实现HCCI燃烧的关键和难点。 辛烷值的不同，会影响到HCCI燃烧的控制策略。针对高辛烷值燃料存在的向小负荷的拓展问题，本文研究了不同的燃烧边界条件，即不同的进气温度和进气压力；和不同的燃料特性，即基础燃料和汽油，对均质压燃的影响。 试验在一台改装后的发动机上进行，燃料的供给由一套电控气道喷射系统控制。试验结果表明，进气加热可以显著的使HCCI燃烧向小负荷工况拓展。进气温度增大，着火时刻提前。同一进气温度下，汽油的着火时刻更早；辛烷值增加，着火时刻推迟。进气加热有效的提高了高辛烷值燃料的HCCI发动机的燃烧效率和指示热效率，降低了HC和CO排放，并没有增加NOx排放。进气压力增大，显著的使HCCI燃烧向小负荷工况拓展；HCCI发动机燃烧效率和热效率提高，HC和CO排放显著较低，NO_X排放并未升高。 本文的研究结果表明：燃烧边界条件的改变，即采用不同的进气温度和进气压力对高辛烷值燃料HCCI发动机有显著的影响。本文的研究对寻找拓宽高辛烷值燃料HCCI工况范围的方法，实现高更多还原

【Abstract】 Energy lacking and environment pollution are two problems that all countries in the world are confronted with today. Homogenous Charge Compression Ignition (HCCI) combustion technology is receiving increased attention for its ultra-low NO_X and PM emissions and high thermal efficiency. HCCI combustion process is hard to control because it is dominated by chemical kinetics of fuel air mixture. In addition, the HCCI operating range is narrow.Different octane number will lead to different HCCI control strategy. For the problem of high octane number extending to low load, different combustion boundaries, that is different intake temperature and pressure; and different fuel quality, that is Primary Reference Fuel and gasoline has been studied by this paper.A series of experiment are carried out on a refit four cylinder engine. The fuels are supplied by an electric controlled port injection system. The experimental results show that, intake heating can lead the HCCI combustion to low load. With the increase of intake temperature, the ignition timing is advanced. Being same intake temperature, the ignition timing of gasoline is earlier than PRF; with the increase of更多还原