首页|Numerical Study on Comparison of Negative and Positive Surface Discharge in c-C4F8/CF3I/CO2 Gas Mixture
Numerical Study on Comparison of Negative and Positive Surface Discharge in c-C4F8/CF3I/CO2 Gas Mixture
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The dynamics of negative surface discharges in c-C4F8/CF3I/CO2 gas mixture is investigated here with a 2D fluid model.The distributions of ion concentration,electric field strength and photon flux during the propagation of the streamer are obtained by solving the drift-diffusion equations of particles and Poisson's equation,and the photon flux variation function during the propagation is also fitted.It is found that the streamer branches occur when the streamer transitions from the upper surface of the insulator to the side surface,and then when the streamer approaches the plane electrode,the photon flux will increase significantly.On this basis,the positive and negative surface discharge models are compared in terms of streamer characteristics,particle characteristics and streamer branches.It is found that the streamer has a higher electron concentration and electric field in the positive model.The streamer develops"floating"in the positive surface discharge,while it is close to the surface of the insulator in the negative model.In addition,the negative streamer branch has a wider width and develops further.
streamer branch surface discharge c-C4F8/CF3I/CO2 gas mixturepositive and negative models
范彬海、周小丽、钱勇、臧奕茗
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Academy for Engineering & Technology,Fudan University,Shanghai 200433,China
Department of Light Sources and Illuminating Engineering,School of Information Science and Technology,Fudan University,Shanghai 200433,China
Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
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