基金项目:
国家自然科学基金(11375051;
11175054);
河北省教育厅项目(LGRC001);
Project supported by National Natural Science Foundation of China (11375051, 11175054), Education Foundation of Hebei Province (LGRC001);
In order to study the formation of a dot-line square pattern with surface discharge, the pattern is observed for the first time in air-argon dielectric barrier discharge with the applied voltage decreasing. The dot-line square pattern is composed of lines and spots (spot with line and spot without line), and the square structure connected by lines and the pattern into 45°. The discharge undergoes the quasi hexagonal pattern, a dot-line square pattern with surface discharge, grid square pattern and random filaments as the applied voltage decreases. A high-speed video camera was used to obtain a short exposure time images for the dot-line square pattern. It was found that the line was formed by surface discharge of bright spots. The spatio-temporal dynamics of the dot-line square pattern were measured by the photomultiplier, and the results showed that the bright spots had discharge in the voltage rising or falling and rising along with multiple discharge, and the spot with line discharge was ahead of the spot without line in the falling. The method of emission spectrum was used to study the molecular vibration temperatures and electron density of different spots in this pattern. Measurements showed that molecular vibrational temperature of spot with line was less than spot without line, while the electron density was the opposite. Finally, the influence of wall charge distribution on the forming process and the spatio-temporal dynamics of the dot-line square patterns was discussed.
图2
带有沿面放电的点线四边形斑图的照片(a)和电压电流波形(b)
Fig.2
Image(a) and waveforms of the applied voltage and current(b) of a dot-line square pattern with surface discharge
图3
随外加电压峰值降低条件下空气-氩气介质阻挡放电中斑图的演化(左列)及相应的Fourier变换(右列)
Fig.3
Pattern scenario (left column) and corresponding Fourier transform (right column) in air-argon dielectric barrier discharge with the decrease of the applied voltage peak value
[11]
MICHAEL FS, STEPHEN JV, MCCORMICK WD, et al.Time-independent square patterns in surface-tension-driven Bénard convection[J]. , 1999, 11(9): 2577-2582.
[12]
LING FY, ANATOLM, ZHABOTINSKY, et al.Stable squares and other oscillatory turing patterns in a reaction-diffusion model[J]. , 2004, 92(19): 198303.
[13]
PI HJ, PARK SY, LEEJ, et al.Superlattice, rhombus, square, and hexagonal standing waves in magnetically driven ferrofluid surface[J]. , 2000, 84(53): 5316-5319.
[14]
董丽芳,朱平,杨京,等. 介质阻挡放电复杂同心圆环斑图的研究[J]. ,2015,41(9):2856-2861.DONGLifang, ZHUPing, YANGJing, et al.Study of complex concentric-ring pattern in dielectric barrier discharge[J]. , 2015,41(9):2856-2861.
[16]
董丽芳,杨京,朱平,等. 介质阻挡放电旋转同心圆环斑图的研究[J]. ,2015,41(2):479-484.DONGLifang, YANGJing, ZHUPing, et al.Study on the rotating concentric spot-ring patterns in dielectric barrier discharge[J]. , 2015, 41(2): 479-484.
[17]
DONG LF, FAN WL, HE YF, et al.Square superlattice pattern in dielectric barrier discharge[J]. , 2006, 73(6): 066206.
[18]
尹增谦,柴志方,董丽芳,等. 大气压氩气放电中的斑图形成[J]. ,2003,52(4):0925-0928.YINZhenqian, CHAIZhifang, DONGLifang, et al.The atmosphere of argon discharge pattern[J]. , 2003, 52(4): 925-928.
[19]
陈俊英,董丽芳,李媛媛,等. 大气压介质阻挡放电超四边形斑图的等离子体参量[J]. ,2012,52(7):5211-5217.CHENJunying, DONGLifang, LIYuanyuan, et al.Plasma parameters of square superlattice pattern in a dielectric barrier discharge[J]. , 2012, 52(7): 5211-5217.
[20]
董丽芳,赵海涛,谢伟霞,等. 介质阻挡放电系统中超四边形斑图形成的实验研究[J]. ,2008,57(9):5768-5773.DONGLifang, ZHAOHaitao, XIEWeixia, et al.Experimental investigation of square superlattice pattern formation in a dielectric barrier discharge[J]. , 2008, 57(9): 5768-5773.
[21]
王永杰,董丽芳,刘伟波,等. 介质阻挡放电亮暗超四边形斑图时空动力学研究[C]∥第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会. ,2013.WANGYongjie, DONGLifang, LIUWeibo, et al.Spatio-temporal dynamics research of bright dark quadrilateral pattern in a dielectric barrier discharge[C]∥The 16th session of the national science and technology of plasma and the first national plasma medicine seminar. Beijing, , 2013.
[22]
刘莹,董丽芳,牛雪娇. 介质阻挡放电中点线超四边形发光斑图研究[J]. ,2014,35(10):1210-1214.LIUYing, DONGLifang, NIUXuejiao.Study on dot-line square superlattice luminous pattern in dielectric barrier discharge[J]. , 2014, 35(10): 1210-1214.
[23]
BRAUERI, PUNSETC, PURWINS HG, et al.Simulations of self-organized filaments in a dielectric barrier glow discharge plasma[J]. , 1999, 85(11): 7569-7572.