Experimental study on micro-explosion characteristics of ADN droplets
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.
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