Mechanism of plasma ignition in electrothermal-chemical launcher

作     者：Yong JIN Yan-jie NI Hai-yuan LI Bao-ming LI 

作者机构：National Key Laboratory of Transient Physics Nanjing University of Science and Technology 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2016年第12卷第2期

页      面：96-100页

核心收录：

学科分类：08[工学] 082601[工学-武器系统与运用工程] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 0826[工学-兵器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

主　　题：等离子体点火 发射装置 电热化学 机理 等离子体射流 固体推进剂 等离子体发生器 持续燃烧 

摘      要：Plasma generator is a core component in an electrothermal-chemical(ETC) launcher. Its work state directly influences the launch efficiency of a system. The interaction between plasma and propellants is a very important mechanism in ETC technology. Based on the transient radiation model and open air plasma jet experiment, the mechanism of plasma ignition process is analyzed. Results show that the surface temperature of local solid propellant grain can quickly achieve the ignition temperature under the action of early transient plasma radiation. But it needs enough time to maintain the high energy flow to make self-sustained combustion of solid propellant grains. Because of the limited space characteristics of transient radiation, the near-field propellant grains can gain enough energy by the strong transient radiation to be ignited and achieve self-sustained combustion. The far-field propellant grains mainly gain the energy by the activated particles in plasma jet to be ignited and self-sustained combustion. Experiments show that plasma jet always has a high flow velocity in the area of the cartridge. Compared with conventional ignition, the solid propellant grains can obtain more quick and uniform ignition and self-sustained combustion by this kind of ablation controlled arc(ACA) plasma via energy skin effect of propellant grains, pre-heat temperature mechanism and high efficient jet diffusion.