摘要
为探究低温工况下醇类掺混对柴油喷雾特性的影响，明晰多元燃料物性与喷雾特性的联系，利用高速摄影技术进行了柴油与丙醇、己醇混合燃料（醇类掺混比分别为0%，20%，40%）低温工况喷雾试验，基于掺混燃料各组分物性进行了Higgins液相贯穿距预测模型修正以及CONVERGE仿真破碎模型参数修正，并进一步通过仿真探究了醇类掺混对柴油喷雾温度及当量比分布特性的影响。结果表明：在低温工况下，醇类的蒸发性远好于柴油，在喷雾发展过程中醇类先于柴油蒸发，高汽化潜热引发了喷雾核心区域温度降低，进而抑制了柴油液滴的破碎与蒸发过程，最终导致了喷雾液相贯穿距的延长，且随着掺混比的增大，抑制作用更加明显。
Abstract
To investigate the impact of alcohol blending on the spray characteristics of diesel under low-temperature conditions and to clarify the relationship between the properties of multi-fuels and spray characteristics, high-speed photography technology was utilized to conduct spray experiments of mixed fuels which consisted of diesel and alcohols like propanol and hexanol with alcohol blending ratios of 0%, 20%, and 40% under low-temperature conditions. Corrections were made to the Higgins liquid phase penetration distance prediction model and the CONVERGE simulation breakup model parameters based on the physical properties of the components of blended fuel. Furthermore, simulations were conducted to explore the effects of alcohol blending on the spray temperature and equivalence ratio distribution characteristics of diesel spray. The results show that the evaporation of alcohols is far superior to that of diesel under low-temperature conditions. During the spray development process, alcohols evaporate before diesel. The high latent heat of vaporization leads to a decrease of temperature in the spray core area, which in turn inhibits the breakup and evaporation process of diesel droplets, ultimately resulting in an extension of spray liquid phase penetration distance. Moreover, as the blending ratio increases, the inhibitory effect becomes more pronounced.
关键词
喷雾特性 /
多元燃料 /
低温试验 /
模型修正 /
燃料 /
物性
Key words
spray characteristic /
multi-fuel /
low-temperature test /
model correction /
fuel /
physical property
黎一锴，陈佳森，孙成瀚，杨子明，潘家营.
多元燃料低温喷雾特性预测模型构建及仿真分析[J]. 车用发动机. 2025, 0(1): 1-11
LI Yikai,CHEN Jiasen,SUN Chenghan,YANG Ziming,PAN Jiaying.
Multi-Fuel Low-Temperature Spray Characteristics Prediction Model Construction and Simulation Analysis[J]. Vehicle Engine. 2025, 0(1): 1-11
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