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	Měření potenciálu plazmatu a elektronového a iontového proudu v obloukovém proudu plazmatu pomocí elektrických sond Hurba, Oleksiy ; Hrabovský, Milan ; Kopecký, Vladimír ; Chumak, Oleksiy The results of studying of a plasma jet with use electric probes are presented. Distribution of potential in anode region of plasma jet and distribution of currents to positively biased probes were received. Distribution of electric field intensity in sheath of cold gas between the anode surface and the jet and distribution of density of power dissipated in the sheath are calculated. Detailed record
	Studium difuzního proudu na hranici oblouku pomocí elektrických sond Chumak, Oleksiy ; Hrabovský, Milan ; Kavka, Tetyana ; Kopecký, Vladimír Electric probes were used for investigation of an intermediate layer between the arc and anode surface in regions outside the main current channel. Distributions of a diffuse current and the potential were measured. Resistance and heating of the intermediate layer by diffuse current were evaluated.It was found that not only the value of diffuse current strongly depends on distance from the arc but also the shape of the distribution and the position of the maximum of the current change with the distance. These trends can be explained by expanding of the plasma jet. Evaluated equivalent intermediate layer resistance shows widening of the conductive region in a stream wise direction. Variation of resistivity of the intermediate layer is much higher than variation of the potential drop on the layer. That means that distributed current as well as Joule heating of the layer are generally controlled by distributed resistance. Detailed record
	Use of image-processing toolbox for powder particle diagnostics in plasma spray process Chumak, Oleksiy ; Kopecký, Vladimír For measurement of distribution of powder particles and their velocities on plasma spraying, imagigng by CCD camera is used.It is difficult to identify the particles injected into plasma jet on photos, because of high brightness of background light source, noises of CCD camera and low contrast of particle images.Filtering of the photos by a function of two-dimensional convolution. Detailed record
	Effect of Gas Flow on Plasma Jet Generated by Hybrid H2O-Ar Torch Kavka, Tetyana ; Kopecký, Vladimír ; Hrabovský, Milan ; Sember, Viktor ; Konrád, Miloš This paper present results of experimental investigation of effect of argon plasma gas flow rate on characteristics of plasma jet in a H2O-Ar DC arc plasma torch.Two different diagnostics technics optical spectroscopy and enthalpy probe have been applied to study plasma jet under atmospheric pressure.Changes inplasma temperature, velocity and composition for different flow rates of argo. Detailed record
	Study of Anode Attachment Behavior and Its Influence on Plasma Jet in Water-Argon Plasma Torch Chumak, Oleksiy ; Hrabovský, Milan ; Kopecký, Vladimír ; Konrád, Miloš In this paper behavior of anode attachment and its effect on plasma jet in dc water-argon plasma torch was studied.Dependence of plasma jet deflection on argon flow rate and on arc current was investigated.Effect of arc current and plasma gas flow rate on position of anode attachment and on arc voltage fluctuations were studied and processes that control the position was discussed. Detailed record
	Spectroscopic and Enthalpy probe Diagnostics of Fluctuating H2O-Ar Thermal Plasma Jet Sember, Viktor ; Kavka, Tetyana ; Kopecký, Vladimír ; Hrabovský, Milan Time averaged OES and EP measurements of the temperature and mole fraction of entrained air in the H2O-Ar dc arc thermal plasma jet are compared.It is shown that choosing an appropriate method of evaluation of spectroscopic data may reduce the effects of fluctuations and departures from equilibrium and lead to more realistic results.The differences between OES and EP measurements. Detailed record
	Condensed Polyphosphate Pigments Prepared in WSP 500 plasmochemical reactor Brožek, Vlastimil ; Hrabovský, Milan ; Kopecký, Vladimír ; Trojan, M. The polyphosphate pigments were produced in a high enthalpy oxygen-hydrogen plasma jet generated in water stabilized plasma torch. Detailed record
	Behaviour of Powder Particles in Thermal Plasma Generated by Hybrid Water-Argon Torch Chumak, Oleksiy ; Kopecký, Vladimír ; Hrabovský, Milan The velocity and trajectories of particles injected into thermal plasma jet were measured for hybrid argon/water plasma torch. Effect of argon flow rate on distribution of particle velocities was investigated. Two-dimensional model of particle motion in plasma jet was formulated and computation results were compared with measurements. Detailed record
	Instability in thermal plasma jet generated by water plasma torch Hrabovský, Milan ; Konrád, Miloš ; Kopecký, Vladimír ; Macura, Pavel Fluctuations and flow instabilities in thermal plasma jet generated in dc arc plasma torch were investigated by optical system with fast response photodiodes. The coherent oscillations were revealed that are produced due to hydrodynamic instability of plasma flow close to the exit nozzle of the torch.Properties of the these oscillations are investigated. Detailed record
	14th International Symposium on Plasma Chemistry Symposium Proceedings Hrabovský, Milan ; Konrád, Miloš ; Kopecký, Vladimír Detailed record

See also: similar author names
1	Kopecký, V.
3	Kopecký, Vladimír
8	Kopecký, Vojtěch
6	Kopecký, Václav
1	Kopecký, Vít

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