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	Ofukování termického proudu plazmatu generovaného plazmatronem Kavka, Tetyana ; Hrabovský, Milan ; Chumak, Oleksiy ; Kopecký, Vladimír The ambient air is entrained intensively into atmospheric pressure thermal plasma jets. A system for shielding plasma jet has been used to improve jet characteristics and reduce oxygen content. Different gases have been applied as a shroud gas – argon, acetylene, methane, mixtures of acetylene-nitrogen and hydrogen-nitrogen. All shroud gases used in experiments affected plasma jet making the profiles of the jet characteristics flattened with higher temperatures and velocities and reduced amount of oxygen. Detailed record
	Difuzní proud v hraniční oblasti oblouku měřený elektrickými sondami 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
	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

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