冷起动工况柴油/煤油燃料喷雾燃烧特性研究  

Spray and Combustion Characteristics of Diesel/Kerosene Blends Under Cold-Start Conditions

作　　者：石智成 吴晗[1] 路佩 吴洋[1] 李海鹰 刘福水[1] SHI Zhi-Cheng;WU Han;LU Pei;WU Yang;LI Hai-Ying;LIU Fu-Shui(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]中国北方发动机研究所,天津300400

出　　处：《工程热物理学报》2020年第5期1279-1285,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51806014)。

摘　　要：本文利用流动式定容燃烧弹结合米散射法、直拍法对低温冷起动工况下柴油/煤油混合燃料喷雾燃烧特性进行可视化测量。结果表明:柴油/煤油混合燃料液相喷雾贯穿距离随着煤油掺混比、温度和密度的增加呈现减小趋势。液相喷雾锥角随着煤油掺混比和环境密度的增加分别呈现减小和增大的趋势,而对环境温度的变化不敏感。不同环境温度、密度下,混合燃料滞燃期、火焰浮起长度、蓝色火焰占总体火焰强度比例随着煤油掺混比的增加呈现先减小后增加的变化趋势。此外,环境温度和密度的增加均使得着火滞燃期显著缩短。In this paper,the flow-type constant volume combustion bomb combined with Miescattering and direct photography methods was used to visually measure the spray and combustion characteristics of diesel/kerosene blends under low-temperature cold-start conditions.The results show that the liquid-phase spray penetration distance of diesel/kerosene blends decreases with the increase of kerosene blending ratio,temperature and density.The liquid-phase spray cone angle decreases and increases with the increase of kerosene blending ratio and ambient density,but is not sensitive to the change of ambient temperature.Under different ambient temperatures and densities,the ignition delay,the flame lift-off length and the blue flame accounts for the percent of the total flame strength of the blends show a trend of decreasing first and then increasing with the increase of kerosene blending ratio.In addition,the increase in ambient temperature and density results in a significant reduction in the ignition delays.

关 键 词：冷启动 低温着火 柴油/煤油 喷雾特性 光学测试 

分 类 号：TK428.9[动力工程及工程热物理—动力机械及工程]