Plasma-propellant interactions studies: measurements of heat flux produced by hydrocarbon ablation-supported plasmas

Williams, Anthony W.; White, Kevin J.

doi:10.1109/20.911821

Cited by 11 publications

(3 citation statements)

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“…9 They allowed plasma impingement on a black-carbon-coated thin copper plate. The temperature history on the back side of the plate was captured using an unfiltered infrared camera.…”

Section: Introductionmentioning

confidence: 99%

Transient Radiative Heat Transfer from a Plasma Produced by a Capillary Discharge

Das

Thynell

et al. 2005

Journal of Thermophysics and Heat Transfer

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The objective of this work is to develop a better understanding of the transient behavior of radiative heat transfer from a plasma. The plasma generation occurred within a 3.2-mm-diam and 26-mm-long polyethylene capillary. Because of its high temperature and high pressure, the plasma evolved from the capillary into an ambient air environment as an underexpanded supersonic jet that interacted with a stagnation plate. Various diagnostic techniques were used. They include heat flux and pressure gauges mounted on the stagnation plate, heat flux gauges and silicon photodiodes mounted below the plasma jet, as well as current transducers interfaced with the electrical circuit. The heat flux gauges were manufactured via sputtering and calibrated using a standard convection oven. A fused-silica window, placed about 1 mm above the gauges, ensured that only the radiative heat flux transmitted by the window was deduced. The row of heat flux gauges mounted below the plasma provided an assessment of the fraction of the radiative heat flux transmitted by the fused-silica window. The results show that the peak of emitted radiant flux occurs immediately after the peak of the discharge of electrical energy, which usually occurred a relatively long time prior to arrival of the precursor shock on the stagnation plate. Nomenclature= axial coordinate, m α = thermal diffusivity, m 2 /s β = temperature coefficient of resistivity, 1/K ρ = density, kg/m 3

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“…9 They allowed plasma impingement on a black-carbon-coated thin copper plate. The temperature history on the back side of the plate was captured using an unfiltered infrared camera.…”

Section: Introductionmentioning

confidence: 99%

Transient Radiative Heat Transfer from a Plasma Produced by a Capillary Discharge

Das

Thynell

et al. 2005

Journal of Thermophysics and Heat Transfer

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“…In terms of heat flux measurement, Bourham et al established a plasma source, SIRENS, to investigate the ablation damage on different materials [9,10] and film coating technology [11], where thermocouples were used to measure the heat flux. By means of an infrared (IR) camera, Williams et al measured the temperature of a copper disk and propellant grains exposed to a hydrocarbon ablation-supported plasma [12] with an approximate average heat flux of 40 MW m −2 . Gebhart et al developed an electrothermal plasma source as a transient heat flux source for simulation of edge-localized modes (ELMs) in tokamaks [13].…”

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.

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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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“…In recent years there has been much experimental investigation into the plasma-propellant interaction (PPI) [3], [4], [5]. In the same time period, however, there has been very little modeling work investigating the PPI, with the most extensive ETC modeling to date investigating either the plasma source [6] or the bulk plasma [7], and not the PPI.…”

Section: Introductionmentioning

confidence: 99%

On the Mechanism of Energy Transfer in the Plasma‐Propellant Interaction

Porwitzky

Keidar

Boyd

2007

Propellants Explo Pyrotec

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A coupled plasma sheath/ablation model is developed for electrothermal chemical gun applications. By combining a commonly employed collisional sheath model with a previous ablation model, the convective heat flux as a function of time to the propellant bed is determined for two potential electrothermal chemical gun propellants, XM39 and JA2. It is found that the convective heat flux varies smoothly from a nearly collisionless to a fully collisional regime over the short duration of the plasma pulse. The possibility of determining an accurate estimate of the amount of heat flux to the propellant bed due to radiation from the bulk plasma presents itself.

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Plasma-propellant interactions studies: measurements of heat flux produced by hydrocarbon ablation-supported plasmas

Cited by 11 publications

References 0 publications

Transient Radiative Heat Transfer from a Plasma Produced by a Capillary Discharge

Transient Radiative Heat Transfer from a Plasma Produced by a Capillary Discharge

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

On the Mechanism of Energy Transfer in the Plasma‐Propellant Interaction

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