Evolution of positive streamers in air over non-planar dielectrics: experiments and simulations
Peer reviewed, Journal article
Accepted version
Permanent lenke
https://hdl.handle.net/11250/3136161Utgivelsesdato
2022Metadata
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- Institutt for elkraftteknikk [2591]
- Publikasjoner fra CRIStin - NTNU [40022]
Originalversjon
10.1088/1361-6595/aca0beSammendrag
We study positive streamers in air propagating along polycarbonate dielectric plates with and without small-scale surface profiles. The streamer development was documented using light-sensitive high-speed cameras and a photo-multiplier tube, and the experimental results were compared with 2D fluid streamer simulations. Two profiles were tested, one with 0.5 mm deep semi-circular corrugations and one with 0.5 mm deep rectangular corrugations. A non-profiled surface was used as a reference. Both experiments and simulations show that the surface profiles lead to significantly slower surface streamers, and also reduce their length. The rectangular-cut profile obstructs the surface streamer more than the semi-circular profile. We find quantitative agreement between simulations and experiments. For the surface with rectangular grooves, the simulations also reveal a complex propagation mechanism where new positive streamers re-ignite inside the surface profile corrugations. The results are of importance for technological applications involving streamers and solid dielectrics. Evolution of positive streamers in air over non-planar dielectrics: experiments and simulations