Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation
Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation
复制标题
DOI：
10.4271/2001-01-1203
复制
发表时间：
2001-03
期刊：
影响因子：
--
通讯作者：
Eric J. Stevens;R. Steeper
中科院分区：
文献类型：
--
作者：
Eric J. Stevens;R. Steeper
在光学直喷火花点火（DISI）发动机中研究了活塞润湿效应。燃料喷雾撞击活塞导致燃料膜的形成，这是可视化的激光诱导荧光（LIF）成像技术。发现氧猝灭会降低液体汽油的荧光产率。在预混合的充量燃烧期间存在的燃料膜点燃以产生活塞顶部池火。这些火灾的特点是使用直接火焰成像。由池火灾产生的烟尘使用激光弹性散射成像，并发现在整个排气冲程中持续存在，这意味着活塞顶池火灾是DISI发动机的发动机排出颗粒物排放的可能来源。
Piston-wetting effects are investigated in an optical direct-injection spark-ignition (DISI) engine. Fuel spray impingement on the piston leads to the formation of fuel films, which are visualized with a laser-induced fluorescence (LIF) imaging technique. Oxygen quenching is found to reduce the fluorescence yield from liquid gasoline. Fuel films that exist during combustion of the premixed charge ignite to create piston-top pool fires. These fires are characterized using direct flame imaging. Soot produced by the pool fires is imaged using laser elastic scattering and is found to persist throughout the exhaust stroke, implying that piston-top pool fires are a likely source of engine-out particulate emissions for DISI engines.