涡流水平对柴油机微粒排放的影响  

Effect of Swirl Level on Particulate Emission of a Diesel Engine

作　　者：张兆合[1] 王建旭[2] 马太民[3] 许允[4] 刘忠长[4] 刘巽俊[4] 

机构地区：[1]解放军汽车管理学院专业综合实验室 [2]解放军汽车管理学院维护教研室 [3]解放军汽车管理学院车辆管理系 [4]吉林大学内燃机工程系

出　　处：《农业机械学报》2001年第2期5-7,14,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 :5 96 76 0 2 8) ;解放军汽车管理学院博士课题启动基金资助项目

摘　　要：用自行设计的喷气式可变涡流进气系统改变车用柴油机气缸内的涡流水平 ,试验研究了不同工况下缸内涡流对微粒排放的影响。结果表明 ,针对工况需要调整气缸内涡流水平是降低柴油机微粒排放的有效手段。中速工况气缸内形成的挤气涡流和膨胀涡流基本可以满足燃料燃烧的需求 ,涡流强度在一定范围内的变化对降低柴油机排气微粒贡献不大。提高低速大负荷工况螺旋进气道形成的相对较低的涡流水平 ,可以有效降低柴油机微粒排放量 ,使微粒排放降低的主要因素是其中干烟排放量的降低。降低高速工况螺旋进气道形成的相对过高的涡流水平 ,可以有效降低柴油机微粒排放量 ,微粒中可溶性有机成分的降低是导致微粒排放降低的主要因素。The effect of intake swirl level inside the cylinder on particulate emission of an automotive diesel engine was experimentally studied using an air injection variable swirl intake system designed by ourselves to change swirl strength. The test results showed that it is an effective method to reduce particulate emission of DI diesel engine by means of changing swirl level in the cylinder. The effect of swirl strength on particulate emission at medium speed operating condition was not significant because the squish and expansion swirl generated by piston movement could meet the needs of fuel combustion. However, in the case of lower speed and heavier load operating conditions, because the swirl strength generated by helical intake passage was too weak, particulate emission could be decreased when swirl level was increased to some extent. The decrease of dry soot led to the decrease of particulate emission. As to higher speed operating conditions, particulate emission could be decreased if a too strong swirl level generated by helical intake passage was decreased to some extent. The particulate emission decrease may be induced by the decrease of soluble organic fraction emission.

关 键 词：柴油机 涡流 可溶性物质 微粒排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]