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Effect of pressure on behavior of anode attachment of dc arc plasma torch

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F05%3A00022261" target="_blank" >RIV/61389021:_____/05:00022261 - isvavai.cz</a>

  • Alternative codes found

    RIV/61389021:_____/05:00374713

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Effect of pressure on behavior of anode attachment of dc arc plasma torch

  • Original language description

    Anode attachment region of dc arc in hybrid argon/water plasma torch was studied at different ambient pressures. Anode region was photographed by CCD camera and voltage fluctuations, caused by anode attachment movement in a restrike mode, were measured by high frequency voltage dividers. The velocity of downstream movement of anode attachment increased with the reduction of pressure and the position of the attachment was shifted counter-stream-wise. The amplitude as well as the frequency of saw-tooth voltage fluctuations was reduced with decreasing pressure. For ambient pressures lower than 30 kPa the constricted anode attachment was not observed and the anode region has diffuse character. The change of anode attachment regime coincides with change ofcharacter of the jet flow from subsonic to supersonic. The measured dependences are explained by changes in the sheath between the plasma jet and the anode surface.

  • Czech name

    Vliv tlaku na vlastnosti anodového připojení oblouku plazmatronu

  • Czech description

    Oblast anodového připojení u hybridního plazmatronu s kombinací argonové a vodní stabilizace byla zkoumána v závislosti na tlaku okolního prostředí. Proud plazmatu byl sledován CCD kamerou a pomocí děličů byly měřeny fluktuace obloukového napětí. Rychlost pohybu anodového připojení roste s klesajícím tlakem, amplituda pilového průběhu napětí klesá. Od tlaku 30 kPa má připojení difuzní charakter a proudění se mění na nadzvukové. Uvedené chování je dáno změnami ve vrstvě mezi proudem plazmatu a povrchem anody.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BL - Plasma physics and discharge through gases

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/GA202%2F05%2F0669" target="_blank" >GA202/05/0669: Expanding supersonic plasma jet generated in dc water-stabilized arcs</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2005

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    High Temperature Materials and Processes

  • ISSN

    1093-3611

  • e-ISSN

  • Volume of the periodical

    9

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    10

  • Pages from-to

    391-400

  • UT code for WoS article

  • EID of the result in the Scopus database