微乳化甲醇柴油液滴蒸发微爆特性试验研究

The micro-explosion of micro-emulsified methanol-diesel can promote fuel atomization and improve the mixing, however the evaporation and micro-explosion mechanism of microemulsified methanol-diesel needs to be further explored. Micro-emulsified methanol-diesel was prepared by phacoemulsification. This work studied the influence of methanol content to emulsifier ratio on the stability and dispersed phase quality of micro-emulsified methanol-diesel, finally to obtain the optimal methanol-emulsifier content ratio of 2:1. Through the droplet evaporation device, the influence of initial volume and methanol content of droplets on emulsion evaporation and micro-explosion characteristics was studied. The initial volume of droplets increased linearly with a growth rate of 2.13 s/μl, but basically did not affect the proportion of evaporation time and droplet evaporation rate at each stage. The increase of methanol content led to a linear decrease in droplet lifetime, with a reduction rate of 2.14 s/μl. Also, the increase of methanol content led to a significant increase in expansion and fluctuation times. The expansion time could be significantly increased by 2.9 times. The increase of methanol content accelerated the droplet evaporation rate, and for every 1% increase in methanol content, the evaporation rate increased by 0.27 s-1. The increase of the initial volume of the droplet and the methanol content will lead to an increase in the expansion ratio and the number of microbursts. Methanol content is the key to affect the micro-explosion. The expansion ratio increases exponentially after the methanol content exceeds 10%.