期刊
IEEE TRANSACTIONS ON PLASMA SCIENCE
卷 42, 期 10, 页码 2398-2399出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2014.2325937
关键词
Discharge current; high-speed visualization; primary streamer; secondary streamer; underwater discharge
资金
- Japan Society for the Promotion of Science
- Collaborative Research Project, Institute of Fluid Science
- Tohoku University, Sendai, Japan
- Tohoku University International Advanced Research and Education Organization
- Grants-in-Aid for Scientific Research [26600124, 24654186, 23360127, 26286069, 24108004] Funding Source: KAKEN
A series of images of a generation process of an underwater secondary streamer from a developed primary streamer was visualized by an ultrahigh-speed camera with a microscope lens. The secondary streamer with a filamentary structure propagated with an average velocity of 30 km/s from one of the channel tips of the semispherical primary streamer with an average propagation velocity of 1.8 km/s. The synchronized current waveform showed that pulsed currents of about 100 mA were changed into a continuous current of about 300 mA when the secondary streamer started to propagate. This experiment was carried out by the application of a single-shot pulsed positive voltage to a needle-to-wire electrode system with a gap length of 6 mm.
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