汽车工程 ›› 2023, Vol. 45 ›› Issue (8): 1489-1498.doi: 10.19562/j.chinasae.qcgc.2023.08.019
所属专题: 发动机&排放专题2023年
• • 上一篇
收稿日期:
2023-01-20
修回日期:
2023-03-03
出版日期:
2023-08-25
发布日期:
2023-08-17
通讯作者:
马骁
E-mail:max@mail.tsinghua.edu.cn
基金资助:
Yixiao Zhang,Xiao Ma(),Xinhui Lu,Zhi Wang,Weilin Zhuge,Shijin Shuai
Received:
2023-01-20
Revised:
2023-03-03
Online:
2023-08-25
Published:
2023-08-17
Contact:
Xiao Ma
E-mail:max@mail.tsinghua.edu.cn
摘要:
针对低温环境下重型柴油机的冷起动,提出了喷雾撞击热壁面引燃、回流稳焰的进气预热方案。基于自主设计搭建的预热实验装置,研究了不同风速、喷油落点、喷油策略下的温升和燃烧特性,并开展了CFD数值模拟。实验结果表明:着火和温升对喷油落点呈较强的敏感性,加热板存在最佳位置,风速10 m/s下的平均温升速率达到4.24 ℃/s。为了兼顾温升速率、燃烧效率和维护成本,高风速下须采取喷射周期为20~25 ms、喷射脉宽为1~3 ms的喷油策略。高速液滴撞击加热板表面后发生回弹和破碎,属于Leidenfrost破碎模式。模拟结果显示:扰流板形成了局部风速低于5 m/s的回流区,促进了蒸发和油气混合,有利于着火和火焰稳定;针对喷射频率合理匹配喷射量,本质上是调控燃烧持续期与喷射周期相适应,使燃油充分利用,提高温升和放热速率。
张翼霄,马骁,卢鑫辉,王志,诸葛伟林,帅石金. 柴油机喷雾碰壁引燃进气预热特性研究[J]. 汽车工程, 2023, 45(8): 1489-1498.
Yixiao Zhang,Xiao Ma,Xinhui Lu,Zhi Wang,Weilin Zhuge,Shijin Shuai. An Investigation on Intake Preheating Characteristics Based on Spray Wall Impinging Ignition for Diesel Engine[J]. Automotive Engineering, 2023, 45(8): 1489-1498.
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