Multi-Fuel Low-Temperature Spray Characteristics Prediction Model Construction and Simulation Analysis

LI Yikai; CHEN Jiasen; SUN Chenghan; YANG Ziming; PAN Jiaying

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (1) : 1-11.

LI Yikai¹,CHEN Jiasen¹,SUN Chenghan¹,YANG Ziming¹,PAN Jiaying²

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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.

Key words

spray characteristic / multi-fuel / low-temperature test / model correction / fuel / physical property

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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