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Investigation of Three-Dimensional Characteristics of Underwater Streamer Discharges

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Published 1 October 2012 • Copyright (c) 2012 The Japan Society of Applied Physics
, , Citation Ryuta Ichiki et al 2012 Jpn. J. Appl. Phys. 51 106101 DOI 10.1143/JJAP.51.106101

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Author affiliations

1 Department of Electrical and Electronic Engineering, Oita University, Oita 870-1192, Japan

2 The Szewalski Institute of Fluid Flow Machinery, Polish Academy of Sciences, Gdańsk 80-231, Poland

3 Department of Marine Electronics, Gdynia Maritime University, Gdynia 81-225, Poland

Dates

  1. Received 22 December 2011
  2. Accepted 5 August 2012
  3. Published

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Abstract

We have developed a new three-dimensional (3D) observation method suitable for studying the structure of streamer discharges. Using this method we investigated the propagation of underwater streamer discharges generated in a nozzle-plate electrode system. As a result, the streamer branching angle was found to take a bell-shaped distribution having a mean value in the range of 65–75° with a standard deviation of about 20°. Moreover, we confirmed that the mean branching angle is a physical quantity that increases with water conductivity. The propagation velocity of the underwater streamer was estimated to be (2–3) ×104 m/s.

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10.1143/JJAP.51.106101