Plasma Ignition and Combustion

Koleczko, Andreas; Ehrhardt, Walter; Kelzenberg, Stefan; Eisenreich, N.

doi:10.1002/1521-4087(200104)26:2<75::aid-prep75>3.0.co;2-q

Cited by 46 publications

(17 citation statements)

References 12 publications

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“…1 An ETC gun has the potential to improve the performance of conventional guns by enhancing the ignition and combustion characteristics of propellants. One of the significant advantages of the ETC system is a smaller ignition delay time as compared with conventional igniters.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, ETC ignition delay is of the order of 1-2 ms while advanced conventional igniters have been shown to exhibit 6-8 ms ignition delay. 1 An ETC system has two components, namely a plasma source and a chemical propellant system. In this system, the propellant is usually ignited with plasma introduced by a jet from a capillary discharge or by an arc from an exploding wire inside the propellant charge.…”

Section: Introductionmentioning

confidence: 99%

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Ablation Study in a Capillary Sustained Discharge

et al. 2007

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Abstract-Electrothermal-chemical (ETC) ignitionsystems have been demonstrated in gun systems to provide desirable characteristics including reproducible shorter ignition delays. The optimum combination of capillary tube and fuse wire properties has not been identified yet. We present a combined theoretical and experimental study of the capillary discharge with an aim to develop a capillary plasma source with efficient energy conversion. The major emphasis in the present capillary discharge model is the ablation phenomenon. Consideration is given to different characteristic subregions near the ablated surface: namely, a space-charge sheath, a Knudsen layer, and a hydrodynamic layer. A kinetic approach is used to determine the parameters at the interface between the kinetic Knudsen layer and the hydrodynamic layer. Coupling the solution of the nonequilibrium Knudsen layer with the hydrodynamic layer provides a self-consistent solution for the ablation rate. According to the model predictions, the peak electron temperature is about 1.4 eV, the polyethylene surface temperature is about 700 K, and the pressure is about 10 MPa in the case of a 0.6 kJ discharge. In parallel, a parametric experimental study of the capillary ablation process is conducted. The ablation rates are measured for capillary tubes made of polyethylene and Teflon. Both experimental measurements and simulations indicate that the ablated mass increases with the peak discharge current and that a smaller diameter capillary yields a larger ablated mass. It is found that model predictions agree well with experimental measurements. Report Documentation PageForm Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ablation Study in a Capillary Sustained Discharge

et al. 2007

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“…An ETC gun is a solid propellant based artillery piece in which the conventional ignition system is replaced with a capillary plasma source. Among the enhancements encountered in plasma based ignition systems are reduced ignition delay time, highly repeatable ignition time, and enhanced burning and combustion of the solid propellant [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Progress Towards an End-to-End Model of an Electrothermal Chemical Gun

Porwitzky¹,

Keidar²,

Boyd³

2008

2008 14th Symposium on Electromagnetic Launch Technology

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Much progress has been made in the last few years toward the development of an end-to-end computer model of an electrothermal chemical gun. Phenomena that must be considered in an electrothermal chemical gun model include the initial capillary plasma properties, the plasma-air interaction, plasma sheath effects, and the plasma-propellant interaction itself. This paper presents an overview of recent progress made modeling these various phenomena. Also discussed are methods under consideration to incorporate surface chemistry effects into the plasma-propellant interaction model.

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“…Application of a low-temperature plasma for igniting a unitary solid propellant (gunpowder) in artillery systems with large barrel diameters is of significant interest for practice, because it can make the ignition more reliable and reduce the total time of ignition of gunpowder charges [1]. The advantages are ensured by the possibility of reaching high temperatures in the plasma, which cannot be provided by conventional igniters, and also by a high level of the radiative heat flux from the plasma jet [2].…”

Section: Introductionmentioning

confidence: 99%

Modeling of ignition of a solid-propellant plate by a low-temperature plasma jet

Рычков

2007

Combust Explos Shock Waves

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A problem of ignition of a semi-infinite solid-propellant plate by a low-temperature plasma jet formed in an igniter under a high-power electric discharge is considered. Particular attention is paid to formation and evolution of zones of forced gasification of the fuel under the action of a heat flux from the plasma to the propellant. The locations of these zones are determined by satisfying two conditions: the propellant surface reaches the gasification temperature and the heat flux exceeds a certain "threshold" value.

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Plasma Ignition and Combustion

Cited by 46 publications

References 12 publications

Ablation Study in a Capillary Sustained Discharge

Ablation Study in a Capillary Sustained Discharge

Progress Towards an End-to-End Model of an Electrothermal Chemical Gun

Modeling of ignition of a solid-propellant plate by a low-temperature plasma jet

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