二硝酰胺铵液滴微爆特性的试验研究

Experimental study on micro-explosion characteristics of ADN droplets

该研究旨在揭示绿色无毒航天推进剂二硝酰胺铵(ADN)液滴在燃烧室内的微爆特性,以期提高发动机燃烧效率并减少污染物排放。通过建立挂滴式试验系统,研究了ADN液滴微爆过程中的形态变化,并分析了环境温度和液滴初始直径对微爆特性的影响。结果表明:环境温度升高并未缩短微爆延迟时间,但导致微爆强度和持续时间减小;液滴微爆持续时间与环境温度无显著负相关性,而当量蒸发速率随温度升高而增加,增加速率逐渐减缓;着火时刻随环境温度升高而提前;液滴初始直径的增大导致微爆延迟时间增加,微爆强度、持续时间和当量蒸发速率与初始直径无明显正相关关系,着火时刻则随之延迟,但趋势逐渐减弱。研究表明,环境温度和液滴初始直径是影响ADN液滴微爆特性的关键因素,对优化ADN作为航天推进剂的使用具有重要理论和工程意义。

The microburst characteristics of green non-toxic aerospace propellant ammonium dinitramide(ADN)droplets in the combustion chamber was studied to improving the engine combustion efficiency and reducing the pollutant emissions.The morphological changes of ADN droplets during microburst were investigated by setting up a hanging-drop test system,and the effects of ambient temperature and initial droplet diameter on the microburst characteristics were analyzed.The results show that the increase in ambient temperature does not shorten the microburst delay time,but leads to a decrease in microburst intensity and duration.Droplet microburst duration and ambient temperature has no significant negative correlation,while the equivalent evaporation rate increases with increasing temperature,the rate of increase gradually slows down.The moment of ignition is advanced with increasing ambient temperature.The increase in the initial diameter of the droplet leads to an increase in the delay time of microburst,microburst intensity,duration and equivalent evaporation rate and the initial diameter of no significant positive correlation,the moment of ignition is delayed,but the trend is gradually weakened.The study shows that the ambient temperature and droplet initial diameter are the key factors affecting the microburst characteristics of ADN droplets,which is of great theoretical and engineering significance to optimize the use of ADN as a space propellant.