Flow Characteristics and Charge Exchange Effects in a Two-Dimensional Model of Electrothermal Plasma Discharges

Esmond, M. J.; Winfrey, A. Leigh

doi:10.1007/s10894-015-0013-6

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…It is noted that the square capillaries, which allow greater diagnostic accessibility, can be employed to guide cylindrically symmetric laser pulses and focus electron beams. Esmond et al [18,22] investigated the effect of geometry and current density on the electrothermal plasma, in which the capillary radius varied from 2 mm to 5 mm, with a length of 90 mm. They suggest that the pulse shape of the generator internal pressure changes significantly with the increase of the generator radius.…”

Section: Introductionmentioning

confidence: 99%

Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model

Zhang¹,

Li²,

Chen³

et al. 2020

J. Phys. D: Appl. Phys.

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The wall material and the electrode material together determine the composition of the capillary discharge plasma. In this paper, an improved ablation model considering polyethylene (PE) and copper ablation and deposition was developed. Generators with different geometric sizes were calculated and tested. The results show that the concentration distributions of copper and PE in the generator were the pair-wise opposite, and the aspect ratio (AR) had a threshold (AR = 8.67). The copper mass density distribution varied from uniform to inhomogeneous with the increase in AR, which was similar to that of its concentration distribution. The maximum copper mass density increased with the increase in AR, and the AR threshold was also 8.67. The relationship between the copper or PE ablated mass and capillary length or diameter approximately followed a power law, and the relationship between the copper or PE ablated mass and AR approximately followed a proportional law. The PE mass density distribution was not similar to that of its concentration for AR ≥ 8.67. The PE ablated mass increased with the increase in AR, and its variation was similar to that of the maximum PE mass density. When the AR(AR > 5.2) was large enough, the PE mass density distribution determined the total mass density distribution. Otherwise, the total mass density distribution was determined by the mass density distribution of PE and copper. Overall, the simulation results were in good agreement with the experiments. These can be used to select the size and material of the capillary in simulating high heat flux plasma or electrothermal chemical gun ignition.

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Section: Introductionmentioning

confidence: 99%

Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model

Zhang¹,

Li²,

Chen³

et al. 2020

J. Phys. D: Appl. Phys.

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show abstract

“…Over the decades, electrothermal plasma discharges have been widely applied in fusion, launching and combustion. The electrothermal plasma is produced by passing high cur rents through a capillary [1], the dimensions of which are typi cally of the order of mm in internal diameter and cm in length. The liner material and discharge wire are ablated by melting, vaporization, and sublimation, and then ionize to form par tially ionized plasma.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous study, electrothermal plasma discharge models were developed taking various factors into account [2]. For the purpose of capturing phenomena occurring at the ablating surface and correctly evaluating the heat flux to the capillary wall [3] and its development [1], a fully two dimensional (2D) model of electrothermal plasma discharges was prepared. It took into account the interspecies interaction forces due to elastic collisions, and although the effects of the plasma flow field and pressure were observed for discharge current pulses peaking at 10 and 20 kA, it lost sight of copper ablation.…”

Section: Introductionmentioning

confidence: 99%

An electrothermal plasma model considering polyethylene and copper ablation based on ignition experiment

Zhang¹,

Li²,

Yang³

2018

J. Phys. D: Appl. Phys.

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In order to study the characteristics of electrothermal plasma interaction with energetic materials, especially the ignition ability, a novel model considering polyethylene and copper ablation is developed, and an ignition experiment system is set up. The parameters of the plasma and the surface conditions of the energetic materials are measured in the testing. The results show the measured first peak pressure to be ~2.2 MPa, the second peak pressure to be ~3.9 MPa, and the visible flame velocity to be ~2000 m s −1 . Circular pits of the order of microns and nanometers in size are observed on the surface of the energetic materials. Further, the parameters of the plasma, including static pressure, total pressure, density, temperature, velocity, copper concentration and PE concentration, are calculated and analyzed by the established model, under discharge currents of 9 kA. The simulation is similar to those of experimental results. A shock wave is observed in the experiment and is presented in the calculations; it plays an important role in the performance of the plasma in the nozzle region, where the parameters of the plasma variation trends are very complex. With the aim of obtaining the overall performance of the plasma, the coupling characteristics of multiple parameters must be taken into account, in accordance with the developed electrothermal plasma model.

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Radiation Heat Transfer and Vapor Shielding in a Two-Dimensional Model of an Electrothermal Plasma Source

Esmond

Winfrey

2016

J Fusion Energ

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Flow Characteristics and Charge Exchange Effects in a Two-Dimensional Model of Electrothermal Plasma Discharges

Cited by 8 publications

References 22 publications

Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model

Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model

An electrothermal plasma model considering polyethylene and copper ablation based on ignition experiment

Radiation Heat Transfer and Vapor Shielding in a Two-Dimensional Model of an Electrothermal Plasma Source

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