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Experimental study of the effect of gas discharge on ionic liquid electrospray

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Plasma Science and Technology 2024年第4期26卷 37-43页

作者：石文杨鹏飞宋培义吴健 School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China FAW-Volkswagen Automotive Co.Ltd. Changchun 130011People’s Republic of China Center for Gravitational Experiments School of PhysicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parameters. In this study, electrospray experiments were conducted on the ionic liquid EMI-BF4. The observations revealed that the operating modes of the ionic liquid depend on the voltage polarity at high voltages. Additionally, a correspondence between the operating mode of ILE and the current signal in the circuit was established. The shape of the liquid cone formed at the needle tip bore a striking resemblance to the plume of corona discharge, suggesting that the motion trajectory of electrons influenced the curvature of the liquid cone. Steamer theory provided a clear explanation for the change in curvature as the voltage increased.

关键词： ionic liquid electrospray Taylor cone jet corona discharge

Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

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Plasma Science and Technology 2023年第4期25卷 101-110页

作者：李丁晨李传李家玮杨文迪肖梦涵张明于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Multi-source corona discharge is a commonly used method to generate more charged particles,but the interaction mechanism between multiple discharge sources,which largely determines the overall discharge effect,has still not been studied much.In this work,a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge sources.Specifically,the effects of the number of electrodes,voltage level,and electrode spacing on the discharge characteristics are studied by taking a double-blade electrode as an example.The calculation results show that,when multiple discharge electrodes operate simultaneously,the superimposed electric field includes multiple components from the electrodes,making the ion distribution and current different from that under a single-blade electrode.The larger the distance between discharge electrodes,the weaker the interaction.When the electrode spacing d is larger than 4 cm,the interaction can be ignored.The results can guide the design of large discharge gap array electrodes to achieve efficient discharge.

关键词： non-equilibrium plasma corona discharge double-blade electrode interaction numerical simulation

Influence of shape effect on dynamic surface charge transport mechanism of cellular electret after corona discharge

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Plasma Science and Technology 2022年第4期24卷 82-88页

作者：张嘉伟张泽磊 T MATSUMOTO 高青青刘原野 K NISHIJIMA 刘亦凡 School of Electrical Engineering Xi'an University of TechnologyXi'an 710048People's Republic of China Faculty of Engineering Fukuoka UniversityFukuoka 814-0180Japan Xi'an Jiaotong University Xi'an 710049People's Republic of China

Surface charge accumulation and transport on cellular polypropylene play an important role in nanogenerators,which could have a potential impact on energy harvesting and wearable devices for zero carbon energy systems and the internet of things.Different shapes have different charge accumulation and decay characteristics of the polymer.Therefore,we studied the influence of the sample’s shape on the surface charge decay by experiment and modeling.The surface potential of square and circular cellular polypropylene was measured by a two-dimensional surface potential measurement system with electrostatic capacitive probe.The experimental result shows that the surface potential distribution of the square sample dissipates non-uniformly from the bell shape to a one-sided collapsed shape,while that of the circular sample dissipates uniformly from the bell shape to the crater-like shape.Moreover,the simulated results of the initial surface potential distributions of the square and circular cellular polypropylene are consistent with the experimental results.The investigation demonstrates that the charge transport process is correlated with the shape of the sample,which provides significant reference for designing electret material used for highly efficient nanogenerators.

关键词： charge transport nanogenerator corona discharge simulation shape effect cellular polypropylene sustainable energy

Improving plasma sterilization by constructing a plasma photocatalytic system with a needle array corona discharge and Au plasmonic nanocatalyst

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Plasma Science and Technology 2023年第1期25卷 111-119页

作者：朱斌李其玮高亚楠闫妍朱益民徐力 Laboratory of Plasma Catalysis College of Environmental Sciences and EngineeringDalian Maritime UniversityDalian 116026People's Republic of China Novel Energy Materials and Catalysis Research Center Shanwei Institute of TechnologyShanwei 516600People's Republic of China

Efficient sterilization by a plasma photocatalytic system(PPS)requires strong synergy between plasma and photocatalyst to inactivate microorganisms while suppressing the formation of secondary pollutants.Here,we report that a PPS constructed from a needle array corona discharge and Au/TiO2plasmonic nanocatalyst could remarkably improve the sterilization of Escherichia coli(E.coli)and alleviate formation of the discharge pollutant O3.At 6 kV,the combination of corona discharge and Au/TiO2achieves sterilization efficiency of 100%within an exposure time of 5 min.At 5 kV and an exposure time of 8 min,the presence of Au/TiO2improves sterilization efficiency of the corona discharge from 73%to 91%and reduces the O3concentration from 0.38 to 0.04 ppm,whereas the presence of TiO2reduces the sterilization efficiency and O3concentration to 66%and 0.17 ppm,respectively.The Au/TiO2in the PPS enables a uniform corona discharge,enhances the interaction between plasma,E.coli and nanocatalysts,and suppresses the formation of O3.Further,the Au/TiO2can be excited by ultraviolet-visible light emitted from the plasma to generate electron-hole pairs,and thus contributes to the formation of reactive radicals and the oxidative inactivation of E.coli.The PPS constructed from a needle array corona discharge and Au-based plasmonic nanocatalyst provides a promising approach for developing high-efficiency sterilization techniques.

关键词： plasma photocatalysis sterilization corona discharge Au/TiO2 nanocatalyst synergetic effect

Numerical simulation and experimental validation of a direct current air corona discharge under atmospheric pressure

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Chinese Physics B 2012年第7期21卷 368-377页

作者：刘兴华何为杨帆王虹宇廖瑞金肖汉光 State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Department of Physics Anshan Normal University

Air corona discharge is one of the critical problems associated with high-voltage equipment. Investigating the corona mechanism plays a key role in enhancing the electrical insulation performance. An improved self-consistent multi-component two-dimensional plasma hybrid model is presented for the simulation of a direct current atmospheric pressure corona discharge in air. The model is based on plasma hydrodynamic and chemical models, and includes 12 species and 26 reactions. In addition, the photoionization effect is introduced into the model. The simulation on a bar-plate electrode configuration with an inter-electrode gap of 5.0 mm is carried out. The discharge voltage- current characteristics and the current density distribution predicted by the hybrid model agree with the experimental measurements. In addition, the dynamics of volume charged species generation, discharge current waveform, current density distribution at an electrode, charge density, electron temperature, and electric field variations are investigated in detail based on the model. The results indicate that the model can contribute valuable insights into the physics of an air plasma discharge.

关键词： corona discharge hybrid model discharge voltage-current characteristics current den-sity distribution

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

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Plasma Science and Technology 2022年第9期24卷 98-107页

作者：李丁晨李传李家玮杨文迪肖梦涵张明杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Efflcient collection of water from fog can effectively alleviate the problem of water shortages in foggy but water-scarce areas,such as deserts,islands and so on.Unlike inefflcient fog meshes,corona discharge can charge water droplets and further enhance the water-collecting effect.This study proposes a novel multi-electrode collecting structure that can achieve efflcient and direction-independent water collection from fog.The multi-electrode structure consists of three parts:a charging electrode,an intercepting electrode and a ground electrode.Four types of watercollecting structures are compared experimentally,and the collection rates from a traditional fog mesh,a wire-mesh electrode with fog coming from a high-voltage electrode,a wire-mesh electrode with fog coming from a ground electrode and a multi-electrode structure are 2–3 g h^(-1),100–120 g h^(-1),60–80 g h^(-1)and 200–220 g h^(-1),respectively.The collection rate of the multielectrode structure is 100–150 times that of a traditional fog mesh and 2–4 times that of a wiremesh electrode.These results demonstrate the superiority of the multi-electrode structure in fog collection.In addition,the motion equation of charged droplets in an electric fleld is also derived,and the optimization strategy of electrode spacing is also discussed.This structure can be applied not only to fog collection,but also to air puriflcation,factory waste gas treatment and other flelds.

关键词： fog collection corona discharge wire-mesh electrode multi-electrode structure collection rate

Multi-point discharge model: study on corona discharge of double-ended needle in large space

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Plasma Science and Technology 2023年第3期25卷 62-69页

作者：李丁晨李家玮李传张明王鹏宇刘志杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Digital Grid Research Institute China Southern Power GridGuangzhou 510670People’s Republic of China The Fifth Bureau of China State Construction Engineering Corporation Changsha 410000People’s Republic of China

corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high-concentration plasma by increasing discharge points to meet production needs. However,the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by a needle–ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages is investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter(25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in large-scale space.

关键词： corona discharge numerical simulation multi-point discharge large space double needle tip electrode

Research on fuze microswitch based on corona discharge effect

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Defence Technology（防务技术） 2021年第4期17卷 1453-1460页

作者： Wen-zhong Lou Heng-zhen Feng Jin-kui Wang Yi Sun Yue-cen Zhao The School of Mechatronical Engineering Beijing Institute of Technology100081BeijingChina

Abnormal voltages such as electrostatic,constant current,and strong electromagnetic signals can erroneously trigger operation of MEMS pyrotechnics and control systems in a fuze,which may result in casualties.This study designs a solid-state micro-scale switch by combining the corona gas discharge theory of asymmetric electric fields and Peek’s Law.The MEMS switch can be transferred from“off”to“on”through the gas breakdown between the corona electrodes.In the model,one of the two electrodes is spherical and the other flat,so a non-uniform electric field is formed around the electrodes.The theoretical work is as follows.First,the relation among the radius of curvature of the spherical electrode,the discharge gap,and the air breakdown voltage is obtained;to meet the low voltage(30-60 V)required to drive the MEMS switch,the radius of curvature of the spherical electrode needs to be 10 e50 mm and the discharge gap between the two electrodes needs to be 9e11 mm.Second,the optimal ratioεis introduced to parameterize the model.Finally,the corona discharge structural parameters are determined by comparing the theoretical and electric field simulation results.The switch is then fabricated via MEMS processing.A hardware test platform is built and the performing chip tested.It is found that when the electrode gap is 9 mm,the electrostatic voltage is at least 37.3 V,with an error of 2.6%between the actual and theoretical air breakdown voltages.When the electrode gap is 11 mm,the electrostatic voltage is at least 42.3 V,with an error of 10.5%between the actual and theoretical air breakdown voltages.Both cases meet the design requirements.

关键词： corona discharge Peek’s law Optimal ratioε MEMS switch

An Alternative Empirical Formula for Positive corona discharge Ⅰ-ⅤCharacteristics in Point-to-Plate Electrode Geometry

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Plasma Science and Technology 2014年第3期16卷 211-218页

作者： A.A.AZOOZ Sabah I.WAYSI Department of Physics College of ScienceMosul University Department of Physics College of EducationDohuk University

Experimental data are presented for a study on the dependence of the I-V character- istics of the corona discharge on pressure and electrode spacing using point-to-plane electrode con- figuration. These experimental data are obtained by a fast, automatic computer data-acquisition system. The data are used to suggest an alternative dimensionally self-consistent empirical equa- tion for the parameterization of the I-V curves. The formula eliminates the need for any prior assumptions concerning the inception voltage, as is customary in this type of work.

关键词： corona discharge inception voltage atmospheric pressure plasma