辅助放电下刷状空气等离子体羽的放电特性和参数诊断  

Discharge characteristics and parameter diagnosis of brushshaped air plasma plumes under auxiliary discharge

作　　者：张雪雪 贾鹏英[1] 冉俊霞[1] 李金懋 孙换霞 李雪辰[1] Zhang Xue-Xue;Jia Peng-Ying;Ran Jun-Xia;Li Jin-Mao;Sun Huan-Xia;Li Xue-Chen(College of Physics Science and Technology,Hebei University,Baoding 071002,China;School of Electrical and Information Engineering,Heilongjiang University of Technology,Jixi 158100,China)

机构地区：[1]河北大学物理科学与技术学院,保定071002 [2]黑龙江工业学院电气与信息工程学院,鸡西158100

出　　处：《物理学报》2024年第8期209-217,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12375250,11875121,51977057,11805013);河北省自然科学基金(批准号:A2023201012,A2020201025,A2022201036);黑龙江省省属本科高校基本科研业务费(批准号:2022-KYYWF-0475)资助的课题.

摘　　要：大气压等离子体射流(APPJ)能产生富含活性粒子的等离子体羽,在众多领域具有广泛的应用前景.从应用角度考虑,如何产生大尺度弥散等离子体羽是APPJ研究的热点之一.目前,利用惰性气体APPJ已经能产生令人满意的大尺度等离子体羽,但从经济性上考虑,如何产生大尺度空气等离子体羽更具有应用价值.针对于此,本工作设计了一个具有辅助放电的APPJ,产生了大尺度刷形空气等离子体羽.结果表明,刷状空气等离子体羽可以在一定电压峰值(Vp)内产生,并且随着Vp增大等离子体羽的长度和发光强度都增大.电压和发光信号波形表明,每半个电压周期最多会有一次放电.每半个电压周期的放电概率和光脉冲的强度都随着Vp增大而增大,但放电起始时刻的电压值会随着Vp增大而降低.高速影像研究表明弥散刷形空气等离子体羽和小尺度空气等离子体羽的产生机制类似,均源于分叉正流光的时间叠加.此外,采集了刷形空气等离子体羽的发射光谱,并利用其对放电的电子温度、电子密度、分子振动温度和气体温度进行了研究.结果表明,等离子体羽的气体温度较低,且基本不随Vp变化.然而电子密度、电子温度和分子振动温度均随着Vp增大而升高.利用激光诱导荧光光谱技术研究了等离子体羽的OH浓度,发现OH分布较为均匀,且其浓度随着Vp增大而增大.最后,对这些变化规律进行定性分析.Atmospheric pressure plasma jet(APPJ)can produce plasma plumes rich in active species,which has a wide scope of applications.From the perspective of applications,it is one of the hot issues in APPJ research to generate a diffuse plasma plume on a large scale.At present,large-scale plasma plume has been produced by noble working gases,which is more economic and valuable if it is reproduced by air used as the working gas.In this work,an APPJ with an auxiliary discharge is proposed,with which a large-scale air plasma plume with a brush shape is produced.Results indicate that the brush-shaped air plume can exist by changing voltage amplitude(Vp)in a certain range.The length and brightness of the plasma plume increase with Vp increasing.The waveforms of voltage and light emission signalindicate that the discharge can start at most once within half a cycle of applied voltage.The probability of discharge and the intensity of light emission pulse for each half a voltage cycle increase with Vp increasing,but the voltage value at the discharge moment decreases with Vp increasing.High-speed imaging study shows that the generation mechanisms of diffuse brush-shaped air plasma plumes and small-scale air plasma are similar,both originating from the temporal superposition of bifurcated normal flow light.In addition,optical emission spectra from the brush-shaped air plasma plume are utilized to study electron temperature,electron density,molecular vibrational temperature,and gas temperature.With Vp increasing,gas temperature is low and almost unchanged,while electron density,electron temperature,and molecular vibrational temperature increase.In addition,OH concentration of the plasma plume is investigated by laser-induced fluorescence,indicating that OH is uniformly distributed,and its concentration increases with the Vp increasing.All these results mentioned above are qualitatively analyzed.

关 键 词：等离子体射流 空气等离子体羽 发射光谱 等离子体参数 

分 类 号：O53[理学—等离子体物理]