柴油机缸内碳烟颗粒形成过程与尺寸分布特性  

Soot Particle Formation Process and Size Distribution Characteristics in Cylinder of Diesel Engine

作　　者：鞠洪玲[1] 成晓北[1] 陈亮[1] 黄荣华[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《内燃机工程》2011年第6期18-24,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(50976039);清华大学汽车安全与节能国家重点实验室开放基金(KF10112)

摘　　要：采用了唯象的半经验碳烟排放模型,考虑了碳粒成核、表面成长、凝结和氧化的基本过程,模拟计算了柴油机缸内燃烧条件下缸内碳烟形成过程中的活性基核、碳粒核的生成规律及碳粒尺寸分布规律,并对碳烟排放进行了分析。计算结果表明:燃烧温度和混合物当量比对初始碳核的生成有很重要的影响,碳核粒子首先在活塞凹坑底部的浓混合区域生成,随燃烧的扩散过程,燃烧室中心位置和凹坑唇边挤流区相继出现较高浓度的基核,但存在浓度相位差,缸内不同位置生成碳粒数量和尺寸分布是不同的,不同尺寸范围的碳粒数量和质量之间存在对应关系。The formation regularity of intermediary products in soot formation process was studied using a phenomenological semi-empirical model, considering soot particle nucleation, surface growth, congeal ment and oxidation. The radical nuclei and soot particle nuclei formation and particle size distribution were simulated and calculated for analyzing the soot emission. The simulation and experiment results indicate that the combustion temperature and mixture equivalence ratio play the key role in production of initial soot particle nuclei. Soot particle nuclei produces firstly in the rich mixture region at piston bowl bottom, then with combustion spreading, the higher density radical nuclei presents successively in combustion chamber center and bowl squish lip area, but here exists a certain density phase difference. Soot particle nuclei quantity and size distribution vary with position in cylinder. There is a correspondent relation between soot particle quantity and quality of different size ranges.

关 键 词：内燃机 柴油机 碳烟颗粒 碳粒尺寸分布 模型 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]