Study of density distribution of electrical exploding tungsten wire in air

Lu, Yihan; Wu, Jian; Shi, Huantong; Zhang, Daoyuan; Li, Xingwen; Jia, Shenli; Qiu, Aici

doi:10.1063/1.5040575

Cited by 12 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, little data could be found on this line pair about the Stark effect. According to the previous research, n e is in the range of 10 18 -10 19 cm −3 during the explosion process [37]. Since the time-integrated spectrum is an overall reflection of the emitted light, neither a simple Lorentz profile nor a Voigt or Gauss profile could fit the lines properly.…”

Section: Emission Spectrum At Different Stored Energymentioning

confidence: 93%

Optical emission and quenching process of a Cu wire explosion: a spectroscopy study

Han

Zhu

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

This paper deals with an experimental study of a copper wire explosion in air and water at atmospheric pressure. The influence of the stored energy, discharge type, ambient medium on the electrical and optical characteristics of a single wire explosion was examined and clarified. Particularly, optical emission spectroscopy as well as self-emission image diagnosis were conducted to understand the radiant and quenching process of the explosion. The results revealed that the radiation mainly contained two stages: a white light (continuous spectrum) flash soon after the moment of explosion, and a long period of line radiation of Cu ions/atoms in the following dozens of microseconds. By analysing characteristic lines, Cu2+ was found in the very early stage of the expansion of the discharge channel (DC). Besides, obvious line radiation of O and N ions/atoms was found when there existed a current pause. As for plasma parameters, the Boltzmann plot method indicated that the average temperature of explosion products was ∼1 eV, while the electron density experienced an apparent attenuation as the expansion of DC. In addition to this, the optical emission in air and water followed two distinctly different patterns, relating to the expansion of DC and diffusion of the ambient medium.

show abstract

Section: Emission Spectrum At Different Stored Energymentioning

confidence: 93%

Optical emission and quenching process of a Cu wire explosion: a spectroscopy study

Han

Zhu

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Although the electron density in the arc channel is lower than 2 × 10 19 cm −3 , we estimate the influence of the atom on the refractive index. [24] The estimation results show that the contribution of an electron to the refractive index is 1000 times that of an atom. Therefore, in the arc channel, the contribution from atoms to the refractive index is still negligible.…”

Section: Electron Density Distributionmentioning

confidence: 99%

Temporal and spatial evolution of air-spark switch plasma investigated by the Mach–Zehnder interferometer

Huang¹,

Lin²,

Zhang³

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

An air-spark switch plasma was diagnosed by the Mach–Zehnder laser interferometer with ultra-high spatial and temporal resolution. The interferograms containing plasma phase shift information at different time were obtained. The phase shift distributions of the plasma were extracted by numerically processing the interferograms. The three-dimensional (3D) electron density distributions of the air-spark switch plasma were then obtained. The working process of the air-spark switch was described by analyzing the temporal and spatial evolution of the plasma electron density.

show abstract

“…This phenomenon could be described by the density distribution of plasma and air. According to the measurement with two-wavelength interferometry by Lu et al, plasma concentrates around the interface of the dense core, and the air density rises from this interface to the shock wave front [10]. Therefore, around the interface, the plasma with a higher density produces strong optical emission via de-excitation, recombination, and bremsstrahlung [13].…”

Section: Plasma Radiation With Different Wire Materials In Airmentioning

confidence: 99%

“…However, the dynamic process of vaporization and ionization is extremely complex and yet to be fully understood [6][7][8]. In order to find out more details of the explosion process, pulsed x-ray or laser backlit images are often used to ascertain the density distribution evolution of the explosion products [9,10]. The development of plasma channel is characterized by different structures primarily depending on parameters of the wire and explosion.…”

Section: Introductionmentioning

confidence: 99%

Spatial–temporal evolution of plasma radiation in electrical wire explosion: a morphological observation

Han¹,

Zhu²,

Wu³

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

This paper deals with an experimental study regarding the spatial–temporal evolution of single wire explosions in air and water at atmospheric pressure. Experiments were carried out with a microsecond timescale pulsed current source under 500 J stored energy. The morphology of the exploding wire with different discharge type, wire material, insulating coat, and ambient medium was intensively observed via self-emission images. The results revealed that the plasma radiation of wire explosion in air mainly contained two stages: initial intense radiation from optically thick plasma, and later decaying radiation from expanded arc-like plasma. A hollow structure was observed in a Cu exploding wire in air, and the plasma channel tended to develop inside it. As for W case, there would always be a core-corona structure, resulting in lower expansion rate and shock wave strength. Moreover, the plasma radiation of the underwater wire explosion was mainly determined by two factors: expansion rate and chemical reaction. The expansion rate of the radiant region in water was only 10–1 mm μs–1 level (1 mm μs–1 level for air), leading to the lagging radiation. No noticeable difference in morphology was found between Cu and W wire explosions in water. Particularly, the Al wire explosion generated a bright light emission due to chemical reactions. Finally, radiative characteristics in an exploding wire were preliminarily concluded and existing problems proposed.

show abstract

Study of density distribution of electrical exploding tungsten wire in air

Cited by 12 publications

References 24 publications

Optical emission and quenching process of a Cu wire explosion: a spectroscopy study

Optical emission and quenching process of a Cu wire explosion: a spectroscopy study

Temporal and spatial evolution of air-spark switch plasma investigated by the Mach–Zehnder interferometer

Spatial–temporal evolution of plasma radiation in electrical wire explosion: a morphological observation

Contact Info

Product

Resources

About