新型HAN基液体推进剂EMP⁃01液滴电点火特性

Droplet Electric Ignition Characteristics of New HAN⁃based Liquid Propellant EMP⁃01

为探究新型硝酸羟胺(HAN)基液体推进剂EMP‑01液滴点火特性,搭建了通过将液滴静置在半球形凹槽内并插入电极的液滴电点火实验平台,在液滴直径6.5 mm、电极间距0.5 mm、电压加载速率为86.31 V∙s-1的工况下,研究了EMP‑01液滴的电点火燃烧特性,确定了着火延迟时间;同时,不改变液滴直径以及电极间距,研究了电压加载速率为34.20~246.37 V∙s^(-1)时液滴着火延迟时间与燃烧过程的变化规律。结果表明,电点火燃烧中,EMP‑01液滴分依次经历为加热、热分解、燃烧3个阶段,并且在热分解阶段会产生周期性的膨胀收缩。电压加载速率为34.20 V∙s^(-1)时,EMP‑01液滴无法成功点火;电压加载速率为49.49~246.37 V∙s^(-1)时,随着电压加载速率增加,EMP‑01液滴着火延迟时间不断减小,且减小速率逐渐变缓。

In order to explore the droplet ignition characteristics of a new type of hydroxylamine nitrate(HAN)‑based liquid propellant EMP‑01,a droplet electric ignition experimental platform was built by placing the droplet in a hemispherical groove and inserting the electrode.The electrical ignition characteristics of EMP‑01 droplets under the conditions of droplet diameter of 6.5 mm,electrode spacing of 0.5 mm and voltage loading rate of 86.31 V·s^(-1)were studied,and the ignition delay time under this condition was determined.At the same time,the variation law of droplet ignition delay time and combustion process was also studied within 34.20-246.37 V·s^(-1)under the condition of constant droplet diameter and electrode spacing.The results show that the droplet separation of EMP‑01 undergoes three stages:heating,thermal decomposition and combustion,and there is a periodic expansion and contraction process in the thermal decomposition stage.When the voltage loading rate is 34.20 V·s^(-1),the EMP‑01 droplet cannot be successfully ignited;When the voltage loading rate is 49.49-246.37 V·s^(-1),the ignition delay time decreases gradually with the increase of voltage loading rate,but with the increase of voltage loading rate,the decrease rate of ignition delay time gradually slows down.