Pressure waves generated by a nanosecond electric explosion of a tungsten wire in water

Pavlenko, A. V.; Григорьев, А. Н.; Afanas’ev, V. N.; Glazyrin, I. V.; Бычков, В. В.

doi:10.1134/s1063785008020132

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…This suggested that the deformation extent was primarily influenced by the total energy rather than the number of discharges. Similar conclusions were given in [14] where it was shown that the pressure of the first shock wave was higher than the second shock wave and it decreased sequentially. In [15], the authors identified that for circuit voltage ranging from 20 to 30 KV and energy stored into the capacitor's bank between 6.64 kJ and 14.94 kJ, the spark gap should range between 17 and 22 mm.…”

Section: Electrohydraulic Forming Process (Ehf)supporting

confidence: 83%

Experimental investigation of the pulse duration on the efficiency and electrode wear of electrohydraulic forming process

Ledoux

2023

Manufacturing Rev.

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Electrohydraulic Forming (EHF) is a high velocity sheet metal forming technique using high-energy electrical discharges in a water chamber to shape complex parts. Despite its potential benefits, the EHF process is not well understood, and further research is needed to comprehend the underlying physical mechanisms and optimize the process parameters. One of the critical factors is the control of energy discharge within the forming chamber in terms of arc duration. The proposed study aimed to analyze its impact on the characteristics of electrohydraulic forming focusing on the efficiency of the operation and electrode wear. As a result, the height of the formed parts was compared and used to evaluate the efficiency of the operation. The electrode wear was estimated by a phenomenological model. By comprehending the relationships between these factors and operational efficiency, a tradeoff was established to enhance the EHF process, taking into account electrode wear, thereby expanding its industrial applications.

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Section: Electrohydraulic Forming Process (Ehf)supporting

confidence: 83%

Experimental investigation of the pulse duration on the efficiency and electrode wear of electrohydraulic forming process

Ledoux

2023

Manufacturing Rev.

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“…This strong phase-explosion SW travels with higher velocity, and gradually catches up and overtakes the weak melting shocks. The completion of phase explosion can be considered close to the voltage peak, and the energy deposition on the falling edge of the voltage waveforms and during the following plasma discharge stage (for the breakdown discharge mode) can further enhance the amplitude or the pulse width of phase explosion SW [87].…”

Section: Strong Sw Generated By a Phase Explosionmentioning

confidence: 99%

Electrical wire explosion as a source of underwater shock waves

Shi¹,

Yin²,

Li³

et al. 2021

J. Phys. D: Appl. Phys.

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The underwater electrical wire explosion (UEWE) is an appealing source of underwater shock waves (SWs) with a high conversion efficiency from electrical energy to mechanical energy, good repeatability and controllability. Industrial applications are already seen in oil-well unblocking and stratum stimulation, and research is currently underway to apply UEWEs in electro-hydraulic forming, exploitation of unconventional gas and oil resources, etc. The emerging new applications call for a review on UEWE research from the perspective of an efficient SW source. This review paper considers the physical processes and numerical simulation methods, electrical and SW characteristics, and current and potential applications, and provides suggestions for future research directions. The code (XJ_UEWE01) developed by the authors to solve a coupling model of UEWE is included. The paper will provide students and researchers new to this field with an explanation of basic concepts of UEWE and a detailed overview of previous studies, and will aid research on UEWE applications, especially device development and parameter optimization.

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“…However, during the development of the plasma jet, its brightness changed in real-time, making it difficult to accurately extract its characteristic parameters using a grey-scale threshold. Pavlenko et al [22] studied the pressure propagation law of shock waves generated by capillary electrical explosions using ceramic piezoelectric sensors and pointed out that the shock waves generated by wire explosions contain two components, which are generated during the phase change of the wire from liquid to gas, and during the breakdown of the wire vapor. A shock wave measurement is widely used in the field of wire electrical explosion, but in the field of gas gap switches there is still little research.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and experimental verification of plasma jet development in gas gap switch

Dong

Guo

Zhang

et al. 2023

Plasma Sci. Technol.

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Plasma jet triggered gas gap switch has obvious advantages in fast control switch. The development of the plasma in the ambient medium is the key factor affecting the triggering conduction of the gas switch. However, the plasma jet process and its characteristic parameters are complicated and the existing test methods cannot fully characterize its development laws. In this work, a two-dimensional transient fluid calculation model of the plasma jet process of the gas gap switch is established based on the renormalization-group (RNG) k-ε turbulence equation. The results show that the characteristic parameters and morphological evolution of the plasma jet are basically consistent with the experimental results, which verifies the accuracy of the simulation model calculation. The plasma jet is a long strip with an initial velocity of 1.0 km/s and develops in both axial and radial directions. The jet velocity fluctuates significantly with axial height. As the plasma jet enters the main gap, the pressure inside the trigger cavity drops by 80%, resulting in a rapid drop in the jet velocity. When the plasma jet head interacts with the atmosphere, the two-phase fluid compresses each other, generating a forward-propelled pressure wave. The plasma jet heads flow at high velocity, a negative pressure zone is formed in the middle part of the jet, and the pressure peak decreases gradually with the height. As the value of the inlet pressure increases, the characteristic parameters of the plasma jet increase. The entrainment phenomenon is evident, which leads to an increase in the pressure imbalance of the atmospheric gas medium, leading to significant Coandǎ effect. Compared with air, the characteristic parameters of plasma jet in SF6 are lower, and the morphological evolution is significantly suppressed. The results of this study can provide some insight into the mechanism of action of the switch jet plasma development process.

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Pressure waves generated by a nanosecond electric explosion of a tungsten wire in water

Cited by 12 publications

References 4 publications

Experimental investigation of the pulse duration on the efficiency and electrode wear of electrohydraulic forming process

Experimental investigation of the pulse duration on the efficiency and electrode wear of electrohydraulic forming process

Electrical wire explosion as a source of underwater shock waves

Numerical simulation and experimental verification of plasma jet development in gas gap switch

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