The electro-acoustic transition process of pulsed corona discharge in conductive water

Huang, Yarong; Yan, Hui; Wang, Bingzhe; Zhang, Xuming; Liu, Zhen; Yan, K.

doi:10.1088/0022-3727/47/25/255204

Cited by 45 publications

(38 citation statements)

References 19 publications

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“…While they are traditionally associated with erosion damage [1,2], recent efforts have been aimed at medical applications, such as contrastenhancing in ultrasonic imaging [3] and shock wave lithotripsy [4]. Both spark-generated bubbles [2,[5][6][7][9][10][11] and laser-generated bubbles [1,8,[12][13][14][15][16][17][18] are very useful tools in experimental studies of free bubble oscillations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of Temperatures in Spark Generated Bubbles Oscillating in Water

Vokurka

2017

Acta Polytech

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Abstract. The surface temperatures of the plasma core in the final stages of the first contraction phase of spark-generated bubbles oscillating under ordinary laboratory conditions in a large expanse of water are determined experimentally. The measurement method is based on an analysis of the optical radiation from the bubbles and on the assumption that the plasma core is radiating as a black-body. It is found that the maximum surface temperatures of the plasma core range 4300-8700 K.

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Section: Introductionmentioning

confidence: 99%

Experimental Determination of Temperatures in Spark Generated Bubbles Oscillating in Water

Vokurka

2017

Acta Polytech

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“…As shown in the first panel, the intensive expansion pulse and the collapse pulse appear at around 100 s and 2.4 ms, respectively, and the bubble oscillation period between them is about 2.3 ms. The collapse pulse is three times greater than the expansion pulse, for which the reason is that the initial bubble volume is relatively bigger than the volume when it almost collapses [31]. It results in much larger internal pressure and makes the bubble collapse much more violently.…”

Section: Acoustic Characteristicsmentioning

confidence: 98%

“…The testing chamber is 480 mm in diameter, and the distance between the discharge electrode and the hydrophone is 12 cm. energy efficiency from the discharge energy to the hydro-mechanical energy of the initial bubble [31]. The variation of this empirical constant at different water depths may result in the deviation between the simulated and experimental results in Fig.…”

Section: B Bubble Behaviormentioning

confidence: 98%

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Electroacoustic Process Study of Plasma Sparker Under Different Water Depth

Huang

Zhang

et al. 2015

IEEE J. Oceanic Eng.

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The plasma sparker has been applied in oceanic highresolution seismic exploration for decades. Normally it is towed on the water surface. This is suitable for shallow water, but if the water depth is great, the resolution will decrease dramatically, especially in the horizontal direction. This paper proposes the concept of a deep-towed plasma sparker and presents an experimental study of plasma sparker performance in terms of electric parameters, bubble behavior, and acoustic characteristics. The results show that hydrostatic pressure at a source depth ranging from 1 to 2000 m has a negligible influence on the electric parameters but a strong influence on bubble behavior, wherein both the maximum bubble radius and oscillation period are decreased. The collapse pulse vanishes when the source depth reaches 1000 m or deeper, and no bubble oscillation can be distinguished. The source level (evaluated by the expansion pulse) is also decreased as the source depth increases; moreover, the greater the discharge energy, the smaller the source level loss. The discharge energy per electrode should be greater than 20 J for the deep-towed plasma sparker, which can make the source level loss induced by hydrostatic pressure smaller than the transmission loss. The fast Fourier transform (FFT) results show that the dominant energy is around 20 kHz, which is mainly induced by the expansion pulse and its oscillation. According to the simulation results, the fundamental frequency of the acoustic waveform increases with source depth in accord with a log linear trend, and also reaches tens of kilohertz in deep water. So, before the development of deep-towed plasma sparker, a new technical solution will need to be developed to solve this problem.Index Terms-Deep-towed, high-resolution seismic exploration, plasma sparker. 0364-9059

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“…When a sufficiently high voltage pulse is applied to the multielectrode array, electrical discharges occur and acoustic pulses are generated in the water. The electroacoustic process in a plasma sparker with a single electrode has been studied theoretically and experimentally in our previous work [4]. The electro-thermal process explains the mechanism of the plasma ignition process, and the plasma-containing bubble plays a key role in the electroacoustic energy transition process.…”

Section: Introductionmentioning

confidence: 99%

Discharge electrode configuration effects on the performance of a plasma sparker

Pei

Zhang

Huang

et al. 2017

Plasma Sci. Technol.

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A multi-electrode array is commonly applied in a plasma sparker to generate stable acoustic pulses. In this paper, the effects of the electrode configuration on the performance of a plasma sparker have been investigated. In terms of the load electrical characteristics, the electrode radius and distance have negligible influence on the electric characteristics, whereas a larger electrode number results in a smaller voltage and a larger current but has little effect on the load energy. Regarding the acoustic characteristics, both the expansion and collapse pulses can be increased by decreasing the electrode tip radius. the influence of the electrode number and electrode gap distance on the amplitude of the expansion pulse was found to be negligible. And the amplitude of the collapse pulse decreases significantly with increasing electrode number. Increasing the electrode number decreases the energy efficiency for intense bubble interactions, thus, a small electrode tip radius and a small electrode number are preferred for the design of a plasma sparker if the total discharge energy is given.

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The electro-acoustic transition process of pulsed corona discharge in conductive water

Cited by 45 publications

References 19 publications

Experimental Determination of Temperatures in Spark Generated Bubbles Oscillating in Water

Experimental Determination of Temperatures in Spark Generated Bubbles Oscillating in Water

Electroacoustic Process Study of Plasma Sparker Under Different Water Depth

Discharge electrode configuration effects on the performance of a plasma sparker

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