NLiu2007Nov27

NLiu2007Nov27 - Photoionization models based on radiative...

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Unformatted text preview: Photoionization models based on radiative transfer and Helmholtz equations for sprite streamer modeling Ningyu Liu CSSL, Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA Abstract Sprite streamers are driven by highly nonlinear space charge waves, and develop in a self- consistent manner. The photoionization produced by UV photons originating from a region of high electric field in the streamer head is responsible for creation of seed electrons in front of the head of a propagating streamer, and is believed to play a critical role in the spatial advancement of both positive and negative streamers. The accurate and efficient evaluation of the effects of photoionization remains one of the most challenging tasks in streamer modeling. In the current literature, it is a common practice to evaluate the photoionization effects using an integral model proposed by Zheleznyak et al. [High Temp., 20, 357, 1982] for non-thermal discharges in air. In proposed by Zheleznyak et al....
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