甲醇柴油微乳化液滴蒸发微爆特性研究

Evaporation and Micro-Explosion Characteristics of Methanol-DieselMicroemulsified Droplet

采用挂滴法分别研究了环境温度和初始液滴体积对微乳化甲醇柴油液滴蒸发特性的影响。结果表明:随着环境温度的升高,微爆发生时刻提前,液滴寿命减小;随着初始液滴体积增大,微爆次数增多,微爆强度逐渐减小。在同等甲醇含量条件下,随着环境温度升高,小液滴(0.8μL)微爆强度逐渐减弱,液滴蒸发过程逐渐平缓,而大液滴(1.6μL)首次微爆强度逐渐增强,微爆次数逐渐增多,液滴波动蒸发逐渐显著。温度较低时小液滴更容易发生微爆,温度高时大液滴更容易发生微爆。双组分液滴蒸发过程中内部成核速率与液滴表面蒸发速率共同影响液滴微爆。

The effects of ambient temperature and initial droplet volume on the droplet evaporation characteristics of microemulsified methanol-diesel fuel were studied by hanging drop method.The results show that the micro-explosion generation moment advances and the droplet lifetime decreases with the increase of ambient temperature.With the increase of initial droplet volume,the number of micro-explosion increases and the intensity of micro-explosion decreases gradually.Under the same methanol content,the micro-explosion intensity of 0.8μL small droplets gradually decreases and the evaporation process of droplets gradually flattens,while the first micro-explosion intensity and frequency of 1.6μL large droplets gradually increase and the droplet fluctuation evaporation gradually become significant with the increase of ambient temperature.Small droplets are more likely to microexplode at lower temperatures,and large droplets are more likely to microexplode at higher temperatures.The internal nucleation rate and the surface evaporation rate of two-component droplet jointly affect the droplet micro-explosion.