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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Inicializace elektrického oblouku v argonu proudícím přes vodní kanál
 Chumak, Oleksiy ; Hrabovský, Milan ; Sforza, T. ; Falier, J.
Initiation of arc in a long channel of gas inside a water volume is a complicated task but is required for starting of a plasma torch with liquid stabilization of arc. It was solved by stepwise process consisted of establishment of a pilot arc in an argon chamber, propagation of ionized argon through the water chamber, reaching an anode surface and establishment of a main arc vie the ionized path. Investigation of different stages of arc initiation is done in this paper.
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Výzkum vlivu množství argony na stabilitu proudu Ar-H-O plazmatu
 Chumak, Oleksiy ; Kavka, Tetyana ; Hrabovský, Milan
The paper examines an effect of an argon amount on the thermal plasma jet generated from water/argon mixture in a dc arc plasma torch. In spite of an increase of plasma velocity with an addition of argon a decrease of plasma jet length is observed for bigger argon amount in the plasma. The investigation was based on an analysis of a jet structure based on imaging of the plasma jet by a CCD camera. Statistical processing of plasma jet photographs provided information about a jet shape and its fluctuations space distribution. It was found that an argon amount increase caused significant intensification of the plasma jet fluctuations.
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Procesy v Gerdienovem oblouku generovaném hybridním plynově-vodním plazmatronem
 Kavka, Tetyana ; Chumak, Oleksiy ; Sember, Viktor ; Hrabovský, Milan
In the present work the basic principles of the Gerdien arc are described. The arc was generated in the plasma torch with hybrid stabilisation of the arc by water and argon. The paper discusses physical processes determining the arc behaviour and governing plasma generation. As the main mechanism of the plasma generation in the water stabilized part is evaporation from the inner surface of the water vortex, heating and ionisation of vapour, the plasma gas flow rate and composition depends on the working parameters of the torch. The amount of the evaporated water cannot be directly measured and was estimated from the mass and power balances of the torch. The flow rate and composition of the generated plasma for different arc currents and argon flow rates have been studied. Increase of the arc current resulted in higher amount of evaporated water, while modification of the argon flow rate did not influence the evaporation rate.
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