Zhao Jianshuo, Huang Zhiyong, Jin Guofeng, Gao Minna, Zhu Huixin
Xi'an Institute of High Technology, Xi'an 710000, Shaanxi Province, China.
ACS Omega. 2022 Apr 19;7(17):14527-14534. doi: 10.1021/acsomega.1c05869. eCollection 2022 May 3.
In order to shorten the ignition delay of 2-azido-,-dimethylethanamine (DMAZ) and dinitrogen tetroxide (NTO), four amines [-butylamine, pyrrole, ,,','-tetramethyl ethylenediamine (TMEDA), and diethylenetriamine (DABH)] with a mass fraction of 5% were added to DMAZ, and the potential energy change and the product change during the reaction of the mixture of an additive and DMAZ with NTO were analyzed by Reactive molecular dynamics (ReaxFF MD) calculation. Then, the ignition delay of the mixture of the additive and DMAZ as well as pure DMAZ with NTO was measured by a drop experiment with a photoelectric sensor and high-speed camera. The results show that the addition of pyrrole greatly reduced the time to reach the maximum system energy and greatly increased the rate of HNO formation. The dripping of the fuel was approximately a uniform linear motion, and the expression was = 43.13 + 7.16. The ignition delay time recorded by the camera was in good agreement with that of the optical signal. The measured ignition delay time for DMAZ with NTO was 261.5 ms. The mixture of pyrrole and DMAZ with NTO had the shortest ignition delay time of 100 ms, and the proportion of shortening the ignition delay time was the largest. The results of the droplet experiment were consistent with those of ReaxFF MD simulation, indicating that HNO plays an important role in the ignition delay, that is, the formation rate of HNO is positively correlated with the ignition delay.
为了缩短2-叠氮基-N,N-二甲基乙胺（DMAZ）与四氧化二氮（NTO）的点火延迟时间，将质量分数为5%的四种胺类化合物（正丁胺、吡咯、N,N,N',N'-四甲基乙二胺（TMEDA）和二乙烯三胺（DABH））添加到DMAZ中，并通过反应分子动力学（ReaxFF MD）计算分析添加剂与DMAZ的混合物与NTO反应过程中的势能变化和产物变化。然后，通过光电传感器和高速摄像机的液滴实验测量添加剂与DMAZ的混合物以及纯DMAZ与NTO的点火延迟时间。结果表明，吡咯的加入大大缩短了达到系统最大能量的时间，并大大提高了HNO的生成速率。燃料液滴近似为匀速直线运动，表达式为y = 43.13x + 7.16。摄像机记录的点火延迟时间与光信号记录的点火延迟时间吻合良好。DMAZ与NTO的实测点火延迟时间为261.5 ms。吡咯与DMAZ的混合物与NTO的点火延迟时间最短，为100 ms，缩短点火延迟时间的比例最大。液滴实验结果与ReaxFF MD模拟结果一致，表明HNO在点火延迟中起重要作用，即HNO的生成速率与点火延迟呈正相关。
