Dielectric breakdown properties of Al-air mixtures  

作　　者：Xiyuan CAI Xiao ZHANG Junyong LU Sai TAN Yongsheng ZHANG Guanxiang ZHANG 蔡喜元;张晓;鲁军勇;谭赛;张永胜;张冠祥(National Key Laboratory of Science and Technology on Vessel Integrated Power System,Naval University of Engineering,Wuhan 430033,People's Republic of China)

机构地区：[1]National Key Laboratory of Science and Technology on Vessel Integrated Power System,Naval University of Engineering,Wuhan 430033,People's Republic of China

出　　处：《Plasma Science and Technology》2021年第5期59-65,共7页等离子体科学和技术（英文版）

基　　金：supported in part by National Natural Science Foundation of China(Nos.51522706,51877214,and 51607187);in part by the National Basic Research Program of China(973 Program)(No.613262)。

摘　　要：In order to investigate the influence of aluminum vapor on the breakdown performance of air,this paper makes a study of the dielectric breakdown characteristics of Al-air mixture in the temperature range of 300-5000 K at atmospheric pressure.A Boltzmann analysis method is used to deal with the electron energy distribution function(EEDF),the reduced ionization coefficients(α/N),the reduced attachment coefficients(η/N)and the critical reduced breakdown strength((E/N)cr)so as to explore the influence of temperature and mixing ratio on the dielectric breakdown properties.In the temperature range of 300-2000 K,the property of the mixture is mainly determined by the mixing proportion of aluminum vapor because the composition of particles remains unchanged.In the temperature range of 2000-2500 K,the decomposition of Al2O_(2)leads to the increase of aluminum oxides and NO,and a rise in the percentage of highenergy electrons as well as the increment ofα/N.Also,the joint action of O_(2)and NO makesη/N increase first and then decrease,and(E/N)crgoes down to a smaller temperature range.An increase in the proportion of aluminum vapor causes(E/N)crto decrease in the low-temperature region and to increase in the high-temperature region,which will reduce the transition between these two temperature regions.

关 键 词：aluminum vapor arc discharges Boltzmann analysis dielectric properties electromagnetic rail launch muzzle arc 

分 类 号：TJ866[兵器科学与技术—武器系统与运用工程]