柴油混合燃料液滴微爆现象及规律研究

Methanol-diesel emulsified droplet and n-hexane-diesel miscible droplet were selected as the research objects. The free falling drop method was used to systematically study micro-explosion phenomenon and its characteristics of the fuel droplets in high temperature environment. Firstly, the expansion and breakup of the emulsified fuel and the miscible fuel during micro-explosion process in high temperature environment were compared. The results show that obvious bubble fusion process can be observed in miscible droplets. Compared to miscible droplets, the breakup of emulsified droplets occurs earlier, the expansion rate is faster, but the expansion ratio is smaller. Secondly, the influence of methanol content and initial diameter on the micro-explosion process of methanol-diesel emulsified droplets was explored. The results show that with the increase of methanol content, the micro-explosion of emulsified oil droplet is first promoted and then suppressed. With the increase of methanol content, the breakup time of emulsified droplets is first advanced and then delayed, and the expansion ratio first increases and then decreases. When the methanol volume fraction is 30%, the micro-explosion effect of the emulsified fuel reaches the best. Finally, two different degrees of micro-explosion were compared. The result shows that the expansion rate and expansion ratio of the entire micro-explosion are greater than those of the partial micro-explosion, so the atomization effect of droplets with entire micro-explosion is better. The reason for the different degrees of microexplosion of the droplets under the same conditions is that the bubble generation positions are different.