With the growing stringent emission regulations, the utilization of clean alternative fuel is becoming more urgent. Bio-ethanol, as a carbon-neutral fuel, is considered to have great potential for use in diesel engines as a clean alternative fuel. Micro-explosion has been studied to be beneficial on improving the secondary breaking of the spray. However, limited studies have been published in public with regard to the micro-explosion in fuel droplets of hydrous ethanol-diesel emulsions. In this study, Experiments are conducted to measure the boundary temperature and observation of the micro-explosion of hydrous ethanol-diesel emulsion. The experimental results indicate that the temperature boundary condition is approximately 170°C. It is related only to the type and proportion of the light components, and is not related to the proportion of diesel fuel. The intensity of the micro-explosion is defined, and it meets the parabolic rule with the fraction of the light component. Micro-explosion is observed under the conditions of homogeneous nucleation and heterogeneous nucleation. The impacts of micro-explosion are investigated. The smaller the droplet diameter, the higher the emulsifier content, and the more difficult it is for a micro-explosion to occur.
展开▼
