Analysis of the bubble-pulsation process of underwater high current pulsed discharge

Zhao, Yong; Liu, Yi; Zhang, He; Ren, Yi; Lin, Fuchang

doi:10.1063/5.0079162

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…The value of the resistance component of the plasma channel in the solid is about a few ohms [11,20], while the inductive component of the spark plasma impedance accounts for less than 20% and is usually ignored [21]. Therefore, compared with the external loop inductance L 0 and the resistance component R pl (t) of the plasma channel, the proportion of the channel inductance L pl (t) is small and can be ignored [22], so equation (1) can be simplified as…”

Section: Plasma Channel Impedance Model In Rockmentioning

confidence: 99%

Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Huang

Liu

Zhao

et al. 2023

Plasma Sci. Technol.

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High voltage pulse discharge (HVPD) rock fragmentation controls the plasma channel to form inside the rock by adjusting the electrical parameters, electrode type, etc. In this paper, a HVPD rock fragmentation test platform was built and the test waveforms were measured. Considering the effects of temperature, channel expansion and electromagnetic radiation, the impedance model of the plasma channel in the rock was established. The parameters and initial values of the model were determined by an iterative computational process. The model calculation results can reasonably characterize the development of plasma channel in rock and estimate the shock wave characteristics. Based on the plasma channel impedance model, the temporal and spatial distribution characteristics of the radial stress and tangential stress in the rock were calculated, and the rock fragmentation effect of the HVPD was analyzed.

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Section: Plasma Channel Impedance Model In Rockmentioning

confidence: 99%

Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Huang

Liu

Zhao

et al. 2023

Plasma Sci. Technol.

Self Cite

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“…And the method of calculating the two components of the voltage can be referred to the previous work and will not be repeated here [23]. The deposition energy E pl (t) can be expressed as shown in the following equation [22] ò ò…”

Section: Time-domain Model Of the Shock Wave Loadmentioning

confidence: 99%

Analysis of spatial damage characteristics of rock under multiple high-voltage pulse discharges: I. Cross-section characteristics

Zhao,

Zhang,

Liu

et al. 2023

Phys. Scr.

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Rock breaking by high-voltage pulse discharge (rock breaking by high-voltage pulse discharge, RHPD) is an efficient technology for rock breaking. A single discharge will lead to the initiation or expansion of cracks inside the rock, and the expansion of cracks after multiple discharges will lead to the destabilization of the rock and finally produce a fractured zone. Because of the difficulty in quantifying the spatial damage characteristics of the fractured zone, in this paper, based on the discrete element method and theoretical analysis, the spatial damage model (spatial damage model, SDM) of rock is established. For a typical liquid-solid combination, from the microscopic point of view, the damage characteristics of the fractured zone on the radial cross-section of the plasma are quantified. The changing characteristics of the damage characteristics were analyzed for multiple discharges. In addition, an experimental platform has been built, and the accuracy of the SDM has been verified by the experimental results. The results show that the increase in the discharge distance will improve the deposition energy and crushing effect, and will also improve the accuracy of the model. The findings of this paper provide a technical reserve for the application of RHPD.

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“…When the electrode discharges in gas, the high voltage directly breaks through the gas to form a plasma channel. In the process of pulsed arc electrohydraulic discharge, there are both the collision ionization of charged particles and the expansion and development of hot bubbles, and the electron avalanche develops along the bubble holes [30][31][32], and finally completes the whole process of pulsed electrohydraulic discharge.…”

Section: High Voltage Breakdown Process Of Electrodementioning

confidence: 99%

Improvement of circuit oscillation generated by underwater high voltage pulse discharges based on pulse power thyristor

Yu¹,

Kang²

2023

Plasma Sci. Technol.

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High voltage fracturing technology was widely used in the field of reservoir reconstruction due to its advantages of being clean, pollution-free, and high-efficiency. However, high-frequency circuit oscillation occurs during the underwater high voltage pulse discharge process, which brings security risks to the stability of the pulse fracturing system. In order to solve this problem, an underwater pulse power discharge system was established, the circuit oscillation generation conditions were analyzed and the circuit oscillation suppression method was proposed. Firstly, the system structure was introduced and the charging model of the energy storage capacitor was established by the state space average method. Next, the electrode high-voltage breakdown model was established through COMSOL software, the electrode breakdown process was analyzed according to the electron density distribution image, and the plasma channel impedance was estimated based on the conductivity simulation results. Then the underwater pulse power discharge process and the circuit oscillation generation condition were analyzed, and the circuit oscillation suppression strategy of using the thyristor to replace the gas spark switch was proposed. Finally, laboratory experiments were carried out to verify the precision of the theoretical model and the suppression effect of circuit oscillation. The experimental results show that the voltage variation of the energy storage capacitor, the impedance change of the pulse power discharge process, and the equivalent circuit in each discharge stage were consistent with the theoretical model. The proposed oscillation suppression strategy can not only prevent the damage caused by circuit oscillation but also reduce the damping oscillation time by 77.1%, which can greatly improve the stability of the system. This research has potential application value in the field of underwater pulse power discharge for reservoir reconstruction.

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Analysis of the bubble-pulsation process of underwater high current pulsed discharge

Cited by 13 publications

References 34 publications

Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Analysis of spatial damage characteristics of rock under multiple high-voltage pulse discharges: I. Cross-section characteristics

Improvement of circuit oscillation generated by underwater high voltage pulse discharges based on pulse power thyristor

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