喷射参数对柴油HCCI复合燃烧过程燃烧效率及散热损失影响的研究  

Effects of Multi-Pulse Injection Parameters on Premixed Diesel Combustion Efficiency and Heat Loss

作　　者：林铁坚[1] 苏万华[1] 裴毅强[1] 赵华[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2004年第4期325-331,共7页Transactions of Csice

基　　金：国家自然科学基金重点项目(59936130);海外青年学者合作研究基金项目(50128605);国家重点基础研究发展规划项目(2001CB209202)。

摘　　要：在复合燃烧模式下研究了喷射参数对燃烧效率、散热损失和热效率的影响。试验结果表明,改变多脉冲喷射定时可控制预混燃烧放热幅度,影响NOx与HC和CO排放的折中关系。多脉冲喷射定时提前,NOx排放减少,但HC和CO增加,导致燃烧效率降低。在平均指示压力0 78MPa下,当采用复合燃烧模式,随主喷射后推,主喷射定时为3°CAATDC时,可获得最高燃烧效率,同时NOx排放仅为280×10-6,烟度为0 4BSU,相对此主喷定时,提前或拖后喷射都会使HC和CO排放增加,从而造成燃烧效率降低。The compound technology of premixed diesel combustion and lean diffusion combustion was developed. The results of engine experiments showed that the multi-pulse injection timing was the key factor for controlling the auto-ignition process of the premixed combustion. advancing the multi-pulse injection timing reduced NO_x emission, but the combustion efficiency deteriorated, and HC and CO emissions increased greatly. In the compound combustion mode, the main injection fuel triggers the lean premixed charge. At the load of IMEP=0.78 MPa, the main injection timing of 3°CA ATDC was a better timing to achieve the higher combustion efficiency, where NO_x emission was only 280×10^(-6) at this injection timing.

关 键 词：喷射参数 柴油机 均质压燃燃烧 脉冲燃油喷射 燃烧效率 散热损失 

分 类 号：TK421.4[动力工程及工程热物理—动力机械及工程]