Experimental Study on Hypergolic Characteristics of Imidazolium Dicyanamide Ionic Liquids in White Fuming Nitric Acid

DU Zenghui; SUN Ce; LI Yutong; GAO Zhongquan; TAN Ziyang; GAO Xuyao; PANG Yingran; HONG Liu; CHEN Pengfei

doi:10.7652/xjtuxb202204002

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Experimental Study on Hypergolic Characteristics of Imidazolium Dicyanamide Ionic Liquids in White Fuming Nitric Acid

更新时间：2025-07-09

- Experimental Study on Hypergolic Characteristics of Imidazolium Dicyanamide Ionic Liquids in White Fuming Nitric Acid
- Vol. 56, Issue 4, Pages: 13-22(2022)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 西安航天动力研究所液体火箭发动机技术重点实验室,西安,710100
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202204002
  CLC： V511
- Online First：10 April 2022，
  
  Published：2022
- 稿件说明：
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DU Zenghui, SUN Ce, LI Yutong, et al. Experimental Study on Hypergolic Characteristics of Imidazolium Dicyanamide Ionic Liquids in White Fuming Nitric Acid[J]. 2022, 56(4): 13-22.
DOI：

DU Zenghui, SUN Ce, LI Yutong, et al. Experimental Study on Hypergolic Characteristics of Imidazolium Dicyanamide Ionic Liquids in White Fuming Nitric Acid[J]. 2022, 56(4): 13-22. DOI： 10.7652/xjtuxb202204002.

摘要

利用滴落实验台在常温常压下对5种咪唑二氰胺类离子液体进行了点火测试实验

研究了咪唑二氰胺类离子液体在白色发烟硝酸中的自燃过程

并分析了阳离子的化学结构与液滴碰撞速度对咪唑二氰胺类离子液体自燃特性的影响。结果显示:1-烯丙基-3-甲基咪唑二氰胺([AMIM][DCA])、1-乙基-3-甲基咪唑二氰胺([EMIM][DCA])和1-丁基-3-甲基咪唑二氰胺([BMIM][DCA])的自燃过程包含3个阶段

即液滴与WFNA的接触、混合与扩散阶段

反应放热、发生微型爆炸阶段以及温度升高、自燃现象产生阶段; 1-己基-3-甲基咪唑二氰胺([HMIM][DCA])和1-辛基-3-甲基咪唑二氰胺([OMIM][DCA])的自燃性能较差

微爆现象不再明显。在同一碰撞速度下

微爆延迟时间和点火延迟时间随着阳离子中侧链长度的增加而增大; 黏度相差不大时

侧链中不饱和程度增加

微爆延迟时间和点火延迟时间将会缩短。对于同一种离子液体而言

微爆延迟时间和点火延迟时间则随着碰撞速度的增大逐渐减小。微爆延迟时间和点火延迟时间二者呈线性正相关

[AMIM][DCA]、[EMIM][DCA]和[BMIM][DCA]这3种离子液体的微爆延迟时间和点火延迟时间的皮尔逊相关系数分别为0.991 6、0.970 4和0.974 1

微爆延迟时间越短

点火延迟时间也越短。

Abstract

In this paper

the hypergolic process of five imidazolium dicyanamide type ionic liquids in white fuming nitric acid is studied with a drop test bench at normal temperature and pressure

and we have analyzed the effect of chemical structure of cation and droplet collision speed on the hypergolic characteristics of imidazolium dicyanamide ionic liquids. The result shows that the hypergolic process of 1-allyl-3-methyl-imidazolium dicyanamide([AMIM][DCA])

1-ethyl-3-methyl-imidazolium dicyanamide([EMIM][DCA])and 1-butyl-3-methyl-imidazolium dicyanamide([BMIM][DCA])consists of three stages

i.e.the contact

mixing and diffusion of droplets with WFNA

the reaction exothermic and microexplosion stage

and the temperature rise and the hypergolic ignition stage; The hypergolic performance of 1-hexyl-3-methyl-imidazolium dicyanamide([HMIM][DCA])and 1-octyl-3-methyl-imidazolium dicyanamide([OMIM][DCA])is poorer

and the microexplosion phenomenon is no longer obvious. At the same collision speed

the microexplosion delay time and ignition delay time increase with the length of the side chain in the cation; when the viscosity is similar

the unsaturation degree in the side chain increases

and the microexplosion and ignition delay time would be shortened. For the same ionic liquid

the microexplosion delay time and ignition delay time would decrease gradually with the increase of the collision speed. There is a linear positive correlation between the microexplosion delay time and ignition delay time. The Pearson correlation coefficients of the microexplosion delay time and ignition delay time of the three ionic liquids([AMIM][DCA]

[EMIM][DCA]and[BMIM][DCA])are 0.991 6

0.970 4 and 0.974 1 respectively. The shorter the microexplosion delay time

the shorter the ignition delay time.

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