Dynamics of electro burst in solids: I. Power characteristics of electro burst

Буркин, В. В.; Kuznetsova, N. S.; Лопатин, В. В.

doi:10.1088/0022-3727/42/18/185204

Cited by 64 publications

(64 citation statements)

References 7 publications

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“…According to the mathematical model, Cho et al [4] obtained fragmentation forms of rock samples of different sizes. Burkin et al [11] proposed a dynamic model of electric explosion by means of mathematical and physical models. The model assumed that the material should be continuous during the time interval considered.…”

Section: Review Of Previous Studies On Mechanical Model and Breakage mentioning

confidence: 99%

“…(1) Equivalent Loop Equation The Marx generator, of the capacitive energy storage type, is often used in high-voltage EPB [11]. A schematic circuit diagram of Marx generator is shown in Figure 2.…”

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

“…The plasma channel adopts a Weizel-Rompe model of impedance [11,12], which can be expressed in the form of a current integral: When the high-voltage pulse discharge occurs, the energy in capacitor pack of the Marx generator is released into the plasma channel and converted into energy of other forms. The scheme of generator energy conversion is shown in Figure 4 [11,15]. The total energy of generator W g is mainly consumed as resistance loss in the electrical circuit W R and forms the energy injected into the plasma channel W td .…”

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

“…The plasma channel adopts a Weizel-Rompe model of impedance [11,12], which can be expressed in the form of a current integral: . Scheme of generator energy conversion: W g -total energy of generator, W R -resistance loss in electrical circuit, W td -energy injected into the plasma channel, W pl -heating energy of the plasma channel, W ws -shockwave energy, W de -internal energy of rock, W ke -kinetic energy, W wj -reflected wave energy.…”

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

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Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Duan

Tan

et al. 2019

Energies

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High-voltage electro pulse boring (EPB) has the advantages of high rock-breaking efficiency and good wall quality, and is a new and efficient potential method of rock breaking. The EPB process is defined as random because it is affected by many factors. At present, there is no suitable physical and mathematical model to describe the process and results of rock breakage in EPB, and the conclusions reached regarding rock-breakage mechanisms are not uniform. In this study, a complete damage model of high voltage EPB in granite is established, which includes a shock wave model and a damage model of high voltage EPB in granite. The damage model is based on the Particle Flow Code two-dimensional program. Use of a damage model of EPB accommodates the complete process of high voltage EPB, from discharge to production of a shock wave, and so rock-breaking via electro pulse can be simulated and calculated. The time-varying waveforms of shock waves with different electrical parameters are simulated and calculated on the basis of the model. Different shock wave forms are loaded into the surface and internal rock in the damage geometric model of EPB granite. Then, the breakage process of the rock surface and internally, and the mechanism of rock breakage using EPB are analyzed. This study provides a scientific basis for the quantitative expression and prediction of rock fragmentation in EPB in order to improve the drilling efficiency and reduction of energy loss in the process of EPB.

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Section: Review Of Previous Studies On Mechanical Model and Breakage mentioning

confidence: 99%

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

Section: The Shockwave Model Of High-voltage Epb In Granitementioning

confidence: 99%

See 2 more Smart Citations

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Duan

Tan

et al. 2019

Energies

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“…The solid destruction occurs when the introduced energy in the discharge channel is enough. 4,10 It was shown by calculation that the coefficient of the generator energy transformation into wave energy of mechanical stress is only 0.1∼0.2 because of the limitation of the effective ratio of specific adiabatic heats. 7,11 Thus, the pulse power is also required to be large enough to break down the solid.…”

Section: Introductionmentioning

confidence: 99%

Discharge characteristics of high voltage pulses inside rocks with increasing their applied number

Zhang

Liu

et al. 2017

AIP Advances

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By conducting experiments for granite and sandstone samples under different conditions, such as voltage amplitude and electrodes gap, the discharge characteristics of high voltage pulses inside the rocks with increasing their applied number have been investigated. In each of the experiments, a certain value for voltage amplitude and electrodes gap is set separately and then, pulses are applied on same surface of the rocks continuously. The time dependent voltage between the electrodes, the current in plasma and the transient states around the electrode tips are measured and recorded separately when each of the pulses is applied. By means of the wave forms of the voltage and the current, variation laws of the discharging time and the energy release into the plasma with increasing applied pulses number have been obtained. The relation between the number of applied pulses and the critical condition of discharge inside of the rocks has been found. Further, the relation between the number of applied pulses required to discharge and the voltage amplitude has been also analyzed. The reasons of why increasing applied pulses number has such effects on discharge characteristics of them inside the granite and sandstone samples have been found and demonstrated.

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Experimental investigation on the rock breaking mechanism of electrode bit by high‐voltage electric pulses

Liu,

Zhang,

Zhu

et al. 2024

Contrib. Plasma Phys

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Because of the low rate of penetration (ROP) and high cost of traditional rotary rock breaking, it is important to explore some unconventional new rock breaking methods. High‐voltage electrical pulse (HVEP) drilling has attracted much attention because of its advantages such as environmental protection, good borehole wall quality, and high rock breaking efficiency. This paper independently designs and builds a complete indoor experimental platform of HVEP electric breakdown, and selects the self‐designed classic coaxial type and cross‐type electrode bits to carry out laboratory experiments of HVEP rock‐breaking, to truly reveal the rock breaking mechanism of HVEP drilling and further promote its industrial application. The influence of the anode structure of electrode bit, liquid insulation medium, drilling fluid circulation condition, and pulse voltage on rock breaking mechanism are investigated. The findings indicate that the bottom‐hole morphology of the rock sample is related to the electrode bit structure. The S‐type electrode bit has a certain discharge blind area, which is not conducive to the rock breaking of HVEP. With the increase of pre‐charging voltage, the effective discharge rate (EDR) of both electrode bits increases gradually, trending towards 100% as the pre‐charging voltage grows. Under non‐circulating working conditions, greater conductivity of liquid medium results in a lower EDR of electrode bits. In all kinds of liquid media, under low voltage (pre‐charging voltage <15 kV), the single pulse penetration depth (SPPD) under the non‐circulating working condition is larger than that of the circulating condition, in contrast, at a higher voltage (pre‐charging voltage >15 kV), the SPPD under the circulating condition is larger than that the non‐circulating condition. To further observe the generation of plasma channel and the rock damage characterization of HVEP, this paper also establishes a three‐dimensional numerical model of dynamic electrical breakdown of red sandstone to reproduce the generation of plasma channel, which can be mutually confirmed by indoor experimental results. The research results are essential for a deeper understanding of the rock breaking mechanism by electric pulse and for providing some theoretical guidance for the industrial application of electric pulse drilling technology.

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Dynamics of electro burst in solids: I. Power characteristics of electro burst

Cited by 64 publications

References 7 publications

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Damage Model and Numerical Experiment of High-Voltage Electro Pulse Boring in Granite

Discharge characteristics of high voltage pulses inside rocks with increasing their applied number

Experimental investigation on the rock breaking mechanism of electrode bit by high‐voltage electric pulses

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