低温等离子体羽射流特性诊断研究
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摘要
为了高效地利用等离子体射流,深入研究大气压下等离子体射流能量机理,优化等离子体射流结构,完善等离子体射流诊断方法已成为等离子体领域的焦点。通过自主搭建的针-环电极射流结构,对大气压放电氩等离子体射流进行试验分析。采用发射光谱法-摄影法-电化学相耦合的测量方法,重点研究了不同放电频率、不同峰值电压对等离子体射流特性的影响。结果表明,针-环电极结构氩等离子体射流放电类似为辉光放电,射流激发的活性粒子主要有亚稳态Ar原子、微弱的O原子以及OH等自由基;射流长度随着外施电压的升高先呈线性增长趋势后趋于稳定状态,随着放电频率的增大射流长度也随之增长,最长可达25 mm;针-环电极结构可以实现可靠的多脉冲射流放电,具体体现为正向双脉冲、负向单脉冲的形式;等离子体射流电子激发温度随着放电频率的增大而增大。
In order to efficiently use the plasma jet,the energy mechanism,optimization of the structure and diagnosis improvement of plasma jet have been focused in the field of plasma.In this paper,the atmospheric pressure discharge argon plasma jet was tested and analyzed using the self-designed needle-ring electrode jet structure.The influences of discharge frequency and peak voltage on the characteristics of plasma jet were studied by coupling the methods of emission spectrometry,photogrammetry and electrochemistry.The results show that the argon plasma jet discharge of the needle ring electrode structure is similar to the glow discharge,and the active particles excited by the jet are mainly free radicals such as Ar,OH and weak O.The jet length increases linearly with the increase of the external application voltage,and then tends to a stable state.The jet length increases up to 25 mm with the increasing of the discharge frequency.The needle and ring electrode structure can achieve a reliable multi-pulse discharge,which is embodied in the form of positive double pulse and negative single pulse.The electron excitation temperature of the plasma jet increases with the increase of the discharge frequency.
In order to efficiently use the plasma jet,the energy mechanism,optimization of the structure and diagnosis improvement of plasma jet have been focused in the field of plasma.In this paper,the atmospheric pressure discharge argon plasma jet was tested and analyzed using the self-designed needle-ring electrode jet structure.The influences of discharge frequency and peak voltage on the characteristics of plasma jet were studied by coupling the methods of emission spectrometry,photogrammetry and electrochemistry.The results show that the argon plasma jet discharge of the needle ring electrode structure is similar to the glow discharge,and the active particles excited by the jet are mainly free radicals such as Ar,OH and weak O.The jet length increases linearly with the increase of the external application voltage,and then tends to a stable state.The jet length increases up to 25 mm with the increasing of the discharge frequency.The needle and ring electrode structure can achieve a reliable multi-pulse discharge,which is embodied in the form of positive double pulse and negative single pulse.The electron excitation temperature of the plasma jet increases with the increase of the discharge frequency.
引文
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[2] J E FOSTER.Plasma-based water purification:challenges and prospects for the future [J].Phys.Plasmas,2017,24(5):055501.
[3] HOU SHI-YING,ZENG PENG,SUN TAO,et al.High Voltage Engineering,2014,40(1):187-193.
[4] JU Y,SUN W.Plasma assisted combustion:Dynamics and chemistry[J].Progress in Energy and Combustion Science,2015,48(12):21-83.
[5] 李和平,于达仁,孙文延,等.大气压放气等离子体研究进展综述[J].高电压技术,2016,42(12):3697-3727.
[6] 王瑞,刘战合,武哲,等.用于飞行器隐身的闭式等离子体厚度选择分析[J].沈阳航空航天大学学报,2011,28(3):1-15.
[7] 卢新培,严萍,任春生,等.大气压脉冲放电等离子体的研究现状与展望[J].中国科学:物理学力学,天文学,2011,41(7):801-815.
[8] 李雪辰,张春艳,李霁媛,等.大气压氩气射流等离子体的光谱特性研究[J].光谱学与光谱分析,2015,35(12):3305-3309.
[9] 鲜于斌,卢新培.等离子体的射流推进机理[J].高电压技术,2012,38(7):1667-1676.
[10] 侯世英,罗书豪.大气压放电氦气等离子体射流特性[J].高电压技术,2014,40(4):1207-1213.
[11] LI X,DI C,JIA P,et al.Characteristics of a direct current-driven plasma jet operated in open air [J].Applied Physics Letters,2013,103(14):144107.
[12] SHOUICHIRO LIO K Y,et al.Influence of gas flowon argon microwave plasma jet at atmospheric pressure [J].Surface and Coating Technology,2011,206(6):1449-1453.
[13] A VAN DEYNSE P,COOLS.Surface modification of polyethylene in an argon atmospheric pressure plasma jet[J].Surface and Coatings Technology,2015,276(6):384-390.
[14] 邵先军,江南,张冠军,等.中频正弦电压下大气压氦等离子体射流的产生机理[J].高电压技术,2012,38(7):1697-1703.
[15] MANGOLINI L,ORLOV K.Radial structure ofa low-frequency atmospheric-pressure glow discharge in he lium[J].Applied Physics Letters,2002,80(10):1722-1724.
[16] 郝艳捧,刘耀阁,涂恩来.大气压氦气介质阻挡多脉冲辉光放电的光学演化过程[J].高电压技术,2012,38(1):188-193.