Study of Structure and Dynamics of Enhanced Plasma Formations Created by Capillary Pulsed Discharge

Pashchina, A. S.; Chinnov, V. F.; Климов, А. И.; Kutlaliev, V; Moralev, I. A.; Сидоренко, М. И.

doi:10.2514/6.2012-1161

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“…This work is devoted to study physical properties and parameters of this actuator in detail. This work is continuation of the previous one 1 . Pulse discharge in the capillary with ablating wall is one of the techniques for obtaining high enthalpy jets [2][3][4] .…”

Section: Introductionmentioning

confidence: 90%

“…Capacitive storage is used for power input pulses creation. Parameters of discharge pulse are settled by selecting the desired values of circuit elements: -storage capacitance C, inductance L, and resistance R. Discharge current waveform corresponds approximately to sine half-wave 21 . Typical values of discharge pulse parameters are the followings: pulse energy Q~50 J -200 J, discharge current amplitude I 0~5 0-600 A, voltage drop U d~1 50-200 V, pulse duration τ d~1 -10 ms. Change of a discharge pulse parameters permit to obtain and investigate the various flow regimes of the plasma jet formation at wide range of its parameters.…”

Section: Plasma Jet Generatormentioning

confidence: 99%

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Influence of Nano-Scale Clusters on Gas Dynamics Parameters of Plasma Jet Created by Capillary Type Discharge

Klimov

Efimov

Pashchina

2014

52nd Aerospace Sciences Meeting

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Our experiments show that parameters and flow regimes of plasma jet created by a pulsed discharge in a capillary are essentially determined by nano-scale clusters, the source of which is the ablative substance of the capillary wall. Estimations show that parameters of plasma and clusters can satisfy the conditions of like-charged particles attraction that provides plasma confinement within the jet boundaries and is the reason of properties, more typical to liquid jet, especially: long propagation range, the lack of divergence, shape integrity and stability in the gas flow, long relaxation time after the discharge off. Nomenclature= Mach number on the capillary outlet m a = reduced mass of gas particle m C = mass of carbon atom m D = mass of cluster m j = reduced mass of jet particle N = expansion degree N 0 = critical expansion degree (for M=1) N D = number of carbon atoms in the cluster n = off-design degree n a0 = total concentration of ions, atoms, molecules and radicals n D = clusters concentration n e = electron density P = discharge power p a = pressure on the capillary outlet p cap = pressure inside the capillary * Leading research scientist, 2 p j = pressure inside the jet PMMA = polymethylmethacrylat PTFE = polytetrafluoroethylene p ∞ = static gas pressure q S = heat flux density on the capillary surface q V = discharge power density R = resistance R e,i = Debye length R g = universal gas constant S cap = surface of capillary T b = vaporization point T d = point of polymer decomposition T e = electron temperature T m = melting point T R = rotational temperature T V = vibrational temperature T S = surface temperature U d = voltage drop V d = rate of depolymerization V subl = ablation rate of the capillary v = jet velocity x C = distance from the capillary outlet to Mach disk Z D = dimensionless charge of the cluster γ = adiabatic index γ e,i = non-ideality parameter Δm = mass of ablated substance per discharge pulse ε 0 = vacuum permittivity Λ = wavelength of shockwave structure ρ cap • = mass density of capillary substance ρ a = mass density of ablated substance ρ j = mass density inside the jet σ = electrical conductivity τ d = discharge pulse duration

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Section: Introductionmentioning

confidence: 90%

Section: Plasma Jet Generatormentioning

confidence: 99%