Optimization of Fusion Pellet Launch Velocity in an Electrothermal Mass Accelerator

Gebhart, T. E.; Holladay, R. T.; Esmond, M. J.; Winfrey, A. Leigh

doi:10.1007/s10894-013-9636-7

Cited by 13 publications

(3 citation statements)

References 22 publications

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“…It is known that the formation of the capillary plasma jet involves interactions between the exploding wire, the arc and the wall material [3,21,22]. At the very beginning of the discharge, an arc appears near the electrode regions due to the contact resistance.…”

Section: Discussionmentioning

confidence: 99%

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Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet

Yang¹,

Fan²,

Chen³

et al. 2019

J. Phys. D: Appl. Phys.

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Capillary discharge plasmas have been widely used in many fields. This paper investigates the influence of different explosion wire materials on the radiative heat flux and spectral characteristics. Three kinds of wire (aluminum, copper and nickel) with 0.3 mm diameter were used as initiation wires to produce an electrothermal plasma, with a capacitor charging voltage of 3 kV. A thin-film calorimeter with high response speed was used for the measurement of the radiative heat flux. At the same time, spectral analysis was performed using a spatially resolved spectrometer with an ICCD. Based on the results, the electrical energy transported to the plasma that is calculated from the voltage and current traces follows the order Cu > Al > Ni, while the radiative heat flux follows the order Al > Cu > Ni. The trends can be explained by the secondary combustion (chemical reaction with the air) of Al and the fact that the dissipated energy is smaller than the vaporization energy for Ni but larger for Al and Cu, resulting in a bad performance in jet heat flux due to the incomplete vaporization of Ni wires. For the Cu and Al cases, a four-stage evolution process of the emitted radiation, which describes the emission, absorption and decay processes, can be found from the spectral analysis.

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Section: Discussionmentioning

confidence: 99%

“…Over the decades, electrothermal plasmas have been widely applied for propulsion [1], material surface deposition, fusion [2][3][4][5], and plasma ignition in artillery [6][7][8]. Previous studies have included measurements of heat flux and spectral analysis of the radiation from the plasma, and computational modelling of the plasma.…”

Section: Introductionmentioning

confidence: 99%

Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet

Yang¹,

Fan²,

Chen³

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Capillary discharge plasma has been found of great value in a variety of applications such as pulsed plasma thrusters [1], fusion reactor pellet injectors [2][3][4][5][6][7], and electrothermal chemical (ETC) launch devices [8][9][10][11][12][13]. In ETC launchers, the capillary discharge plasma is used to ignite the propellants, which has the advantages of a greatly-reduced and reproducible ignition delay, and a high adaptability to a wide range of ambient temperatures [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Study of the enhanced burning rate during the plasma-propellant interaction process

Wang

Yang

Fan

et al. 2019

J. Phys. D: Appl. Phys.

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Plasma ignition technology has been widely used for decades due to its great improvement in enhanced burning rate. However, the interaction process between the plasma jet and the solid propellant is still far from being elucidated. In this paper, coupling the flow model of plasma jet and the chemical reaction model of propellants, a more comprehensive model for predicting the plasma enhanced burning rate is presented. Three types of energetic thermoplastic elastomers propellant are involved. In addition, the closed bomb vessel test is conducted to investigate the burning characteristics of propellant under the action of plasma for comparison. It demonstrates that the enhanced combustion phenomenon of propellants in the experiment can be well described by an enhanced burning rate coefficient epsilon calculated with the model, which could reflect the effect of plasma jet to some extent. The results show that the composition of the energetic material and its surface temperature are the key factors influencing the plasma-enhanced combustion. This model would bring some insight on the interaction mechanisms between plasma and different propellants.

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

Esmond

Winfrey

2015

J Fusion Energ

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Optimization of Fusion Pellet Launch Velocity in an Electrothermal Mass Accelerator

Cited by 13 publications

References 22 publications

Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet

Effects of wire materials on radiative heat flux and spectral characteristics of a capillary discharge plasma jet

Study of the enhanced burning rate during the plasma-propellant interaction process

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

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