喷油压力和燃烧室壁面干涉对喷雾混合过程的影响  

An Investigation of Effects of Injection Parameters and Chamber Wall Confinement on Spray Characteristics in Constant Volume Bomb

作　　者：苏万华[1] 赵奎翰[1] 王金华[1] 

机构地区：[1]天津大学

出　　处：《内燃机工程》1992年第1期1-5,共5页Chinese Internal Combustion Engine Engineering

摘　　要：作者在一个多功能模拟实验装置上,利用高速激光阴影法研究了喷射压力和燃烧室壁面干涉对喷雾混合过程的影响。实验结果表明,提高喷射压力对油束头部贯穿速度的影响不甚明显,但可显著增大油束锥角,增强喷射诱发的气流扰动,提高燃料与空气的混合速率。实验发现,当油束头部与壁面撞击时可增大油束锥角,提高燃空混合率。但过多地向壁面喷射燃油,将在壁面附近形成浓混合气的堆积,恶化混合。因此控制油束贯穿距离和壁面油量是组织直喷式柴油机燃烧过程的关键。An investigation on the effects of fuel injection parameters and chamber wall confinement on spray characteristics was conducted in a constant volume bomb by using the high speed laser shadowgraphy. As the injection pressure is increased,the initial rate of penetration is increased but this rate is rapidly decayed due to the increase in spray angle and air entrainment. The experimental results also show that a suitable amount of fuel impingement is beneficial to the air-fuel mixing process, but excessive impingement will form a stable layer of rich mixture which may cause increasing in unburned HC and soot emissions.

关 键 词：柴油机 喷雾 压力 燃烧室 喷射 

分 类 号：TK421.43[动力工程及工程热物理—动力机械及工程]