高速直喷柴油机碳粒形成和氧化规律的研究

Study of soot formation and oxidation in high speed D. I diesel engine

为研究高速Ｆ１２０柴油机燃烧过程中碳粒在不同的火焰条件下形成和氧化的 规律，运用缸内瞬态取样技术和火焰辐射测量技术在该机采用多孔喷射、雾化燃烧系 统和伞喷、预混合燃烧系统时，测取了以预混合燃烧为主和以扩散燃烧为主的两种燃 烧过程中碳粒、氧浓度和火焰温度变化曲线。结果表明柴油机以预混合燃烧时因混合 气结构均匀和较快的燃烧速度对扼制碳粒的形成有较明显的作用．

The purpose of this study is to investigate soot formation and oxidation behaviors with two different combustion systems for a high speed diesel engine type F120. The conventiona1 mu1ti-ho1es spray system and the conical spray combustion system were used in the single-cy1inder diesel engine. Under various operation conditions the measurements were taken of soot and oxygen concentra- tion by trarsient sampling technique; flame temperature by two-colour method. The resu1ts show that the premixed flame has obviously an effect to control soot formation for its more uniform fuel-air mixture and quick burning velocity.