低温环境柴油机活塞烧蚀燃烧过程分析研究

强永平; 李海鹰; 张炜; 檀丽宏; 朱伟青; 尹艳君; 白洪林; 刘金龙; 李晓娟; 贾晓亮

doi:10.3969/j.issn.1001-2222.2021.03.011

车用发动机 ›› 2021, Vol. 0 ›› Issue (3) : 64-70. DOI: 10.3969/j.issn.1001-2222.2021.03.011

栏目

低温环境柴油机活塞烧蚀燃烧过程分析研究

强永平¹，李海鹰¹，张炜²，檀丽宏¹，朱伟青¹，尹艳君¹，白洪林¹，刘金龙¹，李晓娟¹，贾晓亮³

作者信息 +

Research on Combustion Process of Piston Ablation for Diesel Engine at Low Temperature

QIANG Yongping¹，LI Haiying¹，ZHANG Wei²，TAN Lihong¹,ZHU Weiqing¹,YIN Yanjun¹,BAI Honglin¹,LIU Jinlong¹,LI Xiaojuan¹，JIA Xiaoliang³

Author information +

文章历史 +

摘要

针对某柴油机在低温环境下工作频繁出现活塞烧蚀的问题，通过模拟低温环境试验复现了活塞烧蚀现象。利用三维仿真手段，分析了两种低温环境温度（25 ℃和40 ℃）缸内燃烧过程的微观差异，通过燃烧放热过程和油气混合过程参数曲线以及三维云图对比分析，阐明了活塞烧蚀工况缸内爆燃时油气混合及燃烧放热特点。仿真结果表明：环境温度较低时存在机械负荷和热负荷同时增加的趋势，低温环境温度由40 ℃降低到25 ℃时，最大压升率增加35.4%，累计湿壁量增加12.7%，瞬态放热最大值增加50.7%；喷雾撞壁后向避阀坑扩展，进入侧隙，在上止点附近发生了强烈的压力振荡，促使压力分层，引起局部最高燃烧压力达到20 MPa、最高燃烧温度达到2 700 K的爆燃现象。

Abstract

For the frequent ablation of piston during the operation of diesel engine at low temperature, the failure phenomenon was reproduced through a simulated lowtemperature environment test. Threedimensional simulation methods were used to analyze the microscopic difference of combustion process at 25 ℃ and 40 ℃. The comparison and analysis of the combustion heat release process, the parameter curves of fuel and air mixing process and the threedimensional cloud diagram illustrated the characteristics of fuel and air mixing and combustion heat release for the detonation during the process of incylinder piston ablation. The simulation results show that mechanical load and thermal load have a tendency to increase simultaneously at low temperature. The maximum pressure rise rate increases by 35.4%, the cumulative wet wall volume increases by 12.7%, and the peak of transient heat release rate increases by 50.7% when the temperature decreases from 40 ℃ to 25 ℃. The fuel spray impinges on the wall, expands toward the valve pocket and then enters the side gap. A strong pressure oscillation hence occurs near the top dead center, which promotes pressure stratification so that the local maximum combustion pressure reaches 20 MPa and the maximum combustion temperature is up to 2 700 K.

导出引用

强永平，李海鹰，张炜，檀丽宏，朱伟青，尹艳君，白洪林，刘金龙，李晓娟，贾晓亮. 低温环境柴油机活塞烧蚀燃烧过程分析研究[J]. 车用发动机. 2021, 0(3): 64-70 https://doi.org/10.3969/j.issn.1001-2222.2021.03.011

QIANG Yongping，LI Haiying，ZHANG Wei，TAN Lihong,ZHU Weiqing,YIN Yanjun,BAI Honglin,LIU Jinlong,LI Xiaojuan，JIA Xiaoliang. Research on Combustion Process of Piston Ablation for Diesel Engine at Low Temperature[J]. Vehicle Engine. 2021, 0(3): 64-70 https://doi.org/10.3969/j.issn.1001-2222.2021.03.011