Theoretical Analysis of Plasma Enhancement of Propellant Burning Rate

Alimi, Roger; Berdichevsky, V.

doi:10.1002/prep.200700047

“…The discharge initiates erosive burning of the propellant, and the gasification of mixed plasma-propellant produces high-enthalpy energetic flow. Alimi et al [22,23] presented a physical and mathematical model to describe the effect of plasma jet on the burning rate of a solid propellant. The plasma induces the generation of an internal burning front that increases the burning rate of the propellant, due to the presence of reactive energetic particles in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of shock wave formation on propellant ignition in capillary discharge

Zhang¹,

Gao²,

Xiao³

et al. 2022

Plasma Sci. Technol.

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In order to study the effect of shock wave formation on propellant ignition in capillary discharge, the formation process of shock wave was analyzed by experimental and theoretical methods, the temperature of plasma jet was measured, and the experiments of closed bomb and 30 mm gun were carried out. The results show that the first shock wave has a smaller value and a larger range of influence, while the second shock wave has a larger value and a smaller range of influence. Plasma jet can generate shock wave at the nozzle according to the calculated plasma pressure and velocity, which is well confirmed by experiments and calculations. The plasma jet temperature is high during the formation of shock wave and then decreases sharply. Plasma ignition can increase the burning rate of propellant by about 30% by increasing the burning surface area of propellant. Compared with conventional ignition, the average maximum chamber pressure and average muzzle velocity of plasma ignition are increased by 9.1 MPa and 29.3 m·s-1 (~3%) in a 30 mm gun. Plasma ignition has strong ignition ability and short ignition delay time due to the generation of shock wave, by increasing the burning rate of propellant, the muzzle velocity can be greatly improved when the maximum chamber pressure increases little. The characteristics of the shock wave can be applied in the application of the capillary discharge plasma. For example, it can be applied in fusion, launching and combustion.

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“…Alimi et al proposed a theoretical steady model of plasma enhancement burning rate ε [29,30]. In the model, the transient burning effects are neglected, and ε is mainly determined by the energetic proportions.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

¹

,

Yang

²

,

Fan

³

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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“…

[a] 1Introduction Plasma-propellant interaction had been widely studied to understand the plasma ignition mechanismo fp ropellants [1][2][3][4][5][6][7],a ugmentation burning rate phenomena [8],a nd physical processes [ 9],a nd to benefit the design of the plasma generator to ignite the charge system during the gun or combustion simulator [10].A lso, there are many demonstration tests [11,12] in the electrothermalc hemical gun (ETC) and achieved valuable results to proof the advantage of plasma ignition, such as shorter and reproducible ignitiond elay time, reducedt emperature sensitivity of the propellant, and the possibility of easily adjustingt he electricalp arameters, whichi nfluence the ignition of the combustion process.Althought he plasma ignition systemh as many advantages, it is still encounteredw ith many challenges for its application in the ETC gun. From the viewpoint of propellant charge design, the propellantsa ppropriate to be ignited by plasma playedacriticalr ole in the application of ETC gun systemb asedo nt he intensive academic and practical research and developmento fE TC gun.

…”

mentioning

confidence: 99%

Response of TEGDN Propellants to Plasma Ignition with the Same Magnitude of Ignition Energy as Conventional Igniters in an Interrupted Burning Simulator

Xiao

¹

,

Ying

²

,

Xu

³

2015

Propellants Explo Pyrotec

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[a] 1Introduction Plasma-propellant interaction had been widely studied to understand the plasma ignition mechanismo fp ropellants [1][2][3][4][5][6][7],a ugmentation burning rate phenomena [8],a nd physical processes [ 9],a nd to benefit the design of the plasma generator to ignite the charge system during the gun or combustion simulator [10].A lso, there are many demonstration tests [11,12] in the electrothermalc hemical gun (ETC) and achieved valuable results to proof the advantage of plasma ignition, such as shorter and reproducible ignitiond elay time, reducedt emperature sensitivity of the propellant, and the possibility of easily adjustingt he electricalp arameters, whichi nfluence the ignition of the combustion process.Althought he plasma ignition systemh as many advantages, it is still encounteredw ith many challenges for its application in the ETC gun. From the viewpoint of propellant charge design, the propellantsa ppropriate to be ignited by plasma playedacriticalr ole in the application of ETC gun systemb asedo nt he intensive academic and practical research and developmento fE TC gun. The matcht est on the plasma ignitionf or new kinds of propellants has to be investigated to boost the development of specific propellants appropriate to be ignited by plasma, which were difficult to be ignited by convention ignition methods.In gun propellant chemistry,nitrocellulose (NC) and nitroglycerine (NG) basedg un propellants are highly prone to accidental initiationa sar esult of externals timulus (fire, shock wave, and impact). In ordert or educe the risks, high energy insensitive propellants are an attractive alternative for conventional NC/NG based propellants. The plasticizer triethyleneglycol dinitrate (TEGDN) is added to the system to partially replace nitroglycerine (NG) to increase the force of double-basep ropellants and reduce the sensitivity to the external stimulus. This kind of propellant is denoted as TEGDN propellant in the context. Meanwhile, the use of energetic polymer binderi .e. energetic thermoplastic elastomers (ETPE)i ni ts formulation is regardeda sapractical method to formulate high energy insensitive propellants [13,14].Significant progress on the small-scale test grid related with combustion and energy release was madei nt he development of high energy and insensitive propellants including energetic thermoplastic elastomers (ETPE) [15].Previousw ork [10] focused on the match tests to validate the electrothermal chemical (ETC) gun applicationf or the emergingi nsensitive high energy propellants with high loading density in small-scale demonstration test. The match test on propellant loading parametersa nd plasma Abstract:I no rder to consider the potential influenceo fignition energy factors on the responseo fd ouble basep ropellants plasticized with triethyleneglycol dinitrate (TEGDN propellants), the influence of different ignition methods at the same magnitude of ignition energy level on the response of TEGDN propellants was investigated in an interrupted burning simulator.C om...

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Theoretical Analysis of Plasma Enhancement of Propellant Burning Rate

Cited by 4 publications

References 12 publications

Effect of shock wave formation on propellant ignition in capillary discharge

Effect of shock wave formation on propellant ignition in capillary discharge

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

Response of TEGDN Propellants to Plasma Ignition with the Same Magnitude of Ignition Energy as Conventional Igniters in an Interrupted Burning Simulator

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