燃烧室和喷嘴对均质混合气形成的影响  

Effects of Combustion Chamber and Nozzle on Homogeneous Mixture Formation

作　　者：李孝禄[1] 乔信起[1] 方俊华[1] 黄震[1] 

机构地区：[1]上海交通大学机械与动力工程学院

出　　处：《农业机械学报》2005年第10期1-4,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50276035);国家"973"重点基础研究发展计划资助项目(项目编号:2001CB209208)

摘　　要：利用KIVA3V程序模拟了柴油机早喷形成均质混合气的浓度场和温度场。模拟计算表明,利用早喷可以形成分层均质混合气;使用多孔喷嘴是混合气碰壁造成偏浓的主要原因,活塞形状对分层均质混合气的形成影响不大;使用单孔喷嘴垂直喷射,能形成理想的分层均质混合气,因为在气缸壁附近形成一层很稀的混合气,它将较浓混合气与气缸壁“隔离”起来,避免燃油碰壁。The density and temperature fields of homogeneous mixtures, that formed by early-spray in a diesel engine were simulated by KIVA - 3V. The computational simulations showed that the stratified homogeneous mixtures could be formed by early-injection, and the multi-hole nozzle exerted an impact on rich mixtures impingement while the shape of combustion chamber had little influence. Using vertical single-hole nozzle is a good measure to form ideal stratified homogeneous mixtures because there are lean mixtures near the cylinder wall, which can segregate mixtures to avoid rich mixtures impinging wall.

关 键 词：柴油机 早喷 燃烧室 喷嘴 分层均质混合气 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]