二硝酰胺铵液滴微爆特性的试验研究

The green non-toxic space propellant ammonium dinitramide (ADN) will undergo a micro-explosion effect in the combustion chamber, resulting in better combustion efficiency and lower emissions for the engine. This article takes ADN droplets as the research object, establishes a hanging drop experimental system, and provides the morphological changes and micro-explosion characteristic characterization parameters of ADN droplets during the micro-explosion process; On this basis, a study was conducted on the influence of environmental temperature and initial droplet diameter on droplet micro-explosion characteristics. The research results indicate that the delay time of ADN droplet micro-explosion does not decrease with the increase of environmental temperature; The intensity and duration of droplet micro-explosion will gradually decrease with the increasing of environmental temperature; There is no negative correlation between the percentage of droplet micro-explosion duration in droplet survival time and environmental temperature; The equivalent evaporation rate of droplets will continuously increase with the increasing of environmental temperature, but the increasing rate will become smaller and smaller; The ignition time of droplets will advance with the increasing of ambient temperature. The correlation between ADN droplet micro-explosion numbers and the initial diameter of the droplet is not strong; There is a positive correlation between the maximum diameter of the droplet and the initial diameter of the droplet during the micro-explosion process; The delay time of droplet micro-explosion will increase with the increasing of the initial diameter of the droplet; There is no positive correlation between the intensity, duration, and equivalent evaporation rate of droplet micro-explosion and the droplet initial diameter; The ignition time of droplets will continue to delay as the initial diameter of the droplet increases, but the delay trend will become smaller and smaller. This research is beneficial to deepen people's understanding of the influencing factors and laws of ADN droplet micro-explosion, thereby providing important basis for controlling the AND droplet micro-explosion process.