摘要
ADN(二硝酰胺铵)基单组元液体推进剂是一种新兴的、可替代肼的绿色推进剂,发展非接触式手段、实时分析元素含量对于研究ADN基推力器的燃烧诊断十分重要.通过建立绝对辐射光谱和高分辨率光谱测量系统,优化了实验参数,研究了由ADN-甲醇-水组成推进剂的激光诱导击穿光谱,分析了光谱中元素H,N,O的时间演化特性,基于Boltzmann斜线法和Stark效应法分别得到了激光诱导产生等离子体的电子温度和电子密度的时间演化曲线,推进剂的初始电子温度为68000 K,电子密度为1.6×10^19 cm^-3,利用e指数拟合得到相应的弛豫时间分别为270 ns和90 ns,该实验条件下未发现ADN基推进剂成功点火现象.
ADN(ammonium dinitramide)-based liquid propellant is an emerging environmental friendly mixture with reduced toxicity,which can be considered as a substitute for hydrazine.In order to diagnose the combustion process of ADN-based liquid propellant,it′s necessary to develop nonintrusive means to analyze elemental content in real time.Measuring system of absolute radiation spectrum with high-resolution was established,which could be used to obtain laser-induced breakdown spectra(LIBS)of ADN-methanol-water propellant after optimizing experimental parameters.Thus,time evolution characteristics of elements H,N,O in the propellant could be analyzed.Time evolution curves of electron temperature and density of laser-induced plasma were obtained by the methods of Boltzmann slope and Stark effects,respectively.The initial electron temperature and electron density of propellant are 68000 K,1.6×10^19 cm^-3,respectively.Besides,the curve indicates relaxation time through exponential decay function fitting:270 ns of electron temperature and 90 ns of electron density.Finally,the ignition of ADN-based propellant had not be observed under this experimental condition.
作者
王方仪
张少华
余西龙
WANG Fang-yi;ZHANG Shao-hua;YU Xi-long(State Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,CAS,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《气体物理》
2020年第2期38-46,共9页
Physics of Gases
基金
国家自然科学基金(11672359,11872368,11927803)
北京控制过程研究所先进空间推进技术实验室开放基金(LabASP-2018-121)。
