Analysis of solid propellant combustion behavior under electrothermal plasma injection for ETC launchers

Bourham, Mohamed; Gilligan, J.G.; Oberle, William F.

doi:10.1109/20.559969

Cited by 18 publications

(8 citation statements)

References 12 publications

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“…In this study, a discharge current profile, Fig. 2, was taken from one of the experiments on the PIPE facility at NC State University as a model for the discharge current in Lexan capillaries [3], [11]. The 130µs discharge current peaks to 28.875kA in 30µs and it has been used in all computational simulation in this research.…”

Section: Tapered Electrothermal Capillary Conceptmentioning

confidence: 99%

“…Electrothermal capillary plasma sources in the ETC guns were utilized as an igniter to the bulk-loaded propellant and as an augmentation mechanism to the burn rates of solid propellant [8]- [11]. The importance of ETC research is in its ability to launch projectiles at very high velocities in excess of 5-7km/s, which can't be achieved by conventional gun systems.…”

Section: Introductionmentioning

confidence: 99%

“…Elecrothermal capillary discharges used in most ETC experiments were cylindrical with an average length of 9-15cm and average diameter 4-10mm, and either operating in the ablation-controlled confined arc regime or fused with a thin aluminum wire as an exploding fuse to initiate the discharge [2], [3], [5], [8]- [11]. Pulse length varies between 0.1-1.0ms with discharge currents in the range of few kA to 100s kA, and can provide plasma pressure of several 100MPa, exit plasma velocities of up to 5km/s and greater, and plasma temperature in the range of 10,000-40,000 o K [3][4][5][6][7][8][9][10][11][12][13]. Modeling of these capillaries was either in 0-D or 1-D based on the assumption that the plasma temperature distribution is constant along the radius of the capillary [4]- [15].…”

Section: Introductionmentioning

confidence: 99%

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Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Winfrey

Mittal

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Tapered capillaries operating in the confined controlled arc regime have the advantage of producing focused hyper plasma jets useful for ignition of electrothermal-chemical ETC systems, at peak kinetic temperatures in the range of 14,000-21,000K (~1.2-1.8eV) and considerable jet pressures of 10-70MPa for input discharge current of 20-30kA over a short pulse length 100-150µs. A tapered geometry made of Lexan polycarbonate with 16.8mm inlet and 8.8mm outlet radii produces a plasma jet with a plasma temperature of 14,253K (1.23eV) at a peak bulk velocity of 4.027km/s with a 10.38MPa exit pressure, and a total ablated mass of 10.56mg. Reducing the tapering to 12.6mm inlet and 6.6mm outlet radii produces a plasma jet with 16,382K (1.411eV) at a bulk velocity of 4.34 km/s with 23.27mg ablated mass. Further reduction in the tapering to 8.4mm inlet and 4.4mm outlet radii produces a plasma jet with 20,954K (1.8eV) at a bulk velocity of 4.89km/s with 70.78MPa exit pressure, and total ablated mass of 15.09mg. The preliminary study shows that the narrow tapering angle produces higher pressure, temperature, velocity and more ablated mass. Radiant heat flux at the taper exit varies from 2.2GW/m 2 at the wider tapers to 6.24GW/m 2 for the narrower taper.

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Section: Tapered Electrothermal Capillary Conceptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Winfrey

Mittal

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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“…It has been suggested that the heat transfer mechanism from plasmas is by a process of radiative heat transfer (9 -12) with plasma temperatures being quoted as around 10 000 K -30 000 K. The presence of a vapour shield (10,13) preventing excessive radiation from plasmas reaching solid surfaces suggests that the transfer mechanism for ignition to solid propellants may be other than radiative. However, radiation is still thought to have an important role not only in ignition but also in the initiation, control and optimisation of all plasma=propellant interaction processes (12,14,15) .…”

Section: Plasma Heat Transfer Coefficients -Radiationmentioning

confidence: 99%

Ignition of Propellant by Metallic Vapour Deposition for an ETC Gun System

Taylor¹

2001

Propellants Explos. Pyrotech.

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“…ET capillary plasma sources in the ETC guns were utilized as an igniter to the bulk-loaded propellant and as an augmentation mechanism to the burn rates of solid propellant [8]- [11]. The importance of ETC research is in its ability to launch projectiles at very high velocities in excess of 5-7 km/s, which cannot be achieved by conventional gun systems.…”

Section: Introductionmentioning

confidence: 99%

Hyper Jet Focused-Injection Tapered Capillary Plasma Source Concept

Winfrey

Mittal

Al-Halim

2015

IEEE Trans. Plasma Sci.

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The concept of tapered capillary is introduced as a method of injecting focused plasma jet into the breach of bulk-loaded electrothermal-chemical (ETC) launcher. Tapered capillaries will operate in the confined controlled arc regime, and they can provide the advantage of producing focused hyper plasma jets useful for ignition of ETC systems at controlled plasma temperatures and pressures. The concept is also useful for focused implantation of plasma ions on substrates with desired patterns. Such tapered capillaries can inject plasmas at peak kinetic temperatures in the range of 14 000-21 000 K (∼1.2-1.8 eV) and considerable jet pressures of 10-70 MPa for an input discharge current of 20-30 kA over a short pulselength of 100-150 µs. A tapered geometry made of Lexan polycarbonate with 16.8-mm inlet and 8.8-mm outlet radii produces a plasma jet with a plasma temperature of 14 253 K (1.23 eV) at a peak bulk velocity of 4.027 km/s with a 10.38-MPa exit pressure, and a total ablated mass of 10.56 mg. Reducing the tapering to 12.6-mm inlet and 6.6-mm outlet radii produces a plasma jet with a plasma temperature of 16 382-K (1.411 eV) at a bulk velocity of 4.34 km/s and a total of 23.27-mg ablated mass. Further reduction in the tapering to 8.4-mm inlet and 4.4-mm outlet radii produces a plasma jet with a plasma temperature of 20 954 K (1.8 eV) at a bulk velocity of 4.89 km/s with a 70.78-MPa exit pressure, and a total ablated mass of 15.09 mg. The preliminary study shows that the narrow tapering angle produces higher pressure, temperature, velocity, and more ablated mass. Radiant heat flux at the taper exit varies from 2.2 GW/m 2 for the wider tapers to 6.24 GW/m 2 for the narrower ones. Index Terms-Capillary discharge, electrothermal (ET) plasma, tapered hyper jet sources.0093-3813 He has also been a collaborator with teams from the Egyptian Atomic Energy Authority since 1998, collaborating on plasma applications. His current research interests include electrothermal launchers, plasma-matter interaction, plasma coaxial accelerators, plasma pinches, MHD, mathematical modeling, inertial electrostatic confinement, plasma glow discharge, plasma deposition, and surface modification of polymers.

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Analysis of solid propellant combustion behavior under electrothermal plasma injection for ETC launchers

Abstract: A b s t r a c t -E n h a n c e d burn rates o f s o l i d

Cited by 18 publications

References 12 publications

Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Electrothermal tapered capillary hyper jet focused-injection plasma source concept

Ignition of Propellant by Metallic Vapour Deposition for an ETC Gun System

Hyper Jet Focused-Injection Tapered Capillary Plasma Source Concept

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