Underwater pulsed spark discharge influenced by the relative position between the top of a pin electrode and an insulating tube

Xudong GAO (高旭东); Jixuan WANG (王继选); Yanfeng GAO (高艳丰); Hongyan YAN (闫红艳); Kaiqiang XUE (薛凯强); Xingnan DENG (邓星男); Xin YANG (杨新)

doi:10.1088/2058-6272/ab5f3d

Plasma Science and Technology > 2020 > 22(5): 55401-055401. > DOI: 10.1088/2058-6272/ab5f3d

Xudong GAO (高旭东), Jixuan WANG (王继选), Yanfeng GAO (高艳丰), Hongyan YAN (闫红艳), Kaiqiang XUE (薛凯强), Xingnan DENG (邓星男), Xin YANG (杨新). Underwater pulsed spark discharge influenced by the relative position between the top of a pin electrode and an insulating tube[J]. Plasma Science and Technology, 2020, 22(5): 55401-055401. DOI: 10.1088/2058-6272/ab5f3d

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Underwater pulsed spark discharge influenced by the relative position between the top of a pin electrode and an insulating tube

School of Water Conservancy and Hydroelectric power, Hebei University of Engineering, Handan 056038, People's Republic of China

Funds: This work is supported by the Science and Technology Research Project of the Hebei Higher Education Institutions of China: No. ZD2014031.

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Received Date: August 04, 2019
Revised Date: December 03, 2019
Accepted Date: December 04, 2019

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Abstract

Abstract

Needle-to-plane geometry has been widely investigated and used in underwater pulsed discharges. The position relationship between the needle tip and insulation layer significantly affects the discharge patterns. We carried out experiments on underwater pulsed discharge with the needle tip protruding from, recessing into, and flushing with the insulating tube. The results are as follows. First, underwater pulsed discharge has a strong randomness under the experimental conditions. Different discharge patterns appeared under the same experimental environment. Second, recession into the insulator surface led to a higher probability of occurrence but a lower strength of spark discharge than protrusion. Third, between the needle tip protruding from and recessing into the insulation material, the average speed of propagation of underwater pulsed spark discharge decreased by an order of magnitude. The study shows that the optimum length of needle tip protruding from the insulation layer is 1 mm to obtain a strong underwater pulsed spark discharge.

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Underwater pulsed spark discharge influenced by the relative position between the top of a pin electrode and an insulating tube