Experimental investigation of plasma in arc-anode area.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00468681" target="_blank" >RIV/61389021:_____/16:00468681 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Experimental investigation of plasma in arc-anode area.

Popis výsledku v původním jazyce

We investigate plasma in the anode attachment area of DC arc plasma torch. The processes in this area influence lifetime of the anode, stability of the plasma flow in a plasma jet and their studying helps better understanding of a movement of the anode attachment in the restrike mode1.We used the high-speed camera (max. 1,080,000 fps and min. exposure time 0.25 μs) and synchronized cathode-anode voltage measurements (sample rate 80 MHz). The anode used was external and therefore it was possible to directly observe the attachment motion during the restrike mode. For this mode, the anode attachment moves periodically downstream along the anode surface. It very often comes to a stop (dwells) at anode surface inhomo geneities, where anode material vaporizes more intensively than in the immediate vicinity. The average total dwell time then describes irregular wearing of the anode surface is worn under various plasma torch parameters. The results also bring better understanding of the anode attachment motion. Based on our experiments we offer an explanation of the restrike anode mode and of the second curvature of the anode attachment, close to the anode surface, proposed in earlier publications2.

Název v anglickém jazyce

Experimental investigation of plasma in arc-anode area.

Popis výsledku anglicky

We investigate plasma in the anode attachment area of DC arc plasma torch. The processes in this area influence lifetime of the anode, stability of the plasma flow in a plasma jet and their studying helps better understanding of a movement of the anode attachment in the restrike mode1.We used the high-speed camera (max. 1,080,000 fps and min. exposure time 0.25 μs) and synchronized cathode-anode voltage measurements (sample rate 80 MHz). The anode used was external and therefore it was possible to directly observe the attachment motion during the restrike mode. For this mode, the anode attachment moves periodically downstream along the anode surface. It very often comes to a stop (dwells) at anode surface inhomo geneities, where anode material vaporizes more intensively than in the immediate vicinity. The average total dwell time then describes irregular wearing of the anode surface is worn under various plasma torch parameters. The results also bring better understanding of the anode attachment motion. Based on our experiments we offer an explanation of the restrike anode mode and of the second curvature of the anode attachment, close to the anode surface, proposed in earlier publications2.

Druh

O - Ostatní výsledky

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

<a href="/cs/project/GA15-19444S" target="_blank" >GA15-19444S: Konverze plynných a kapalných uhlovodíků a organických látek v proudu termického plazmatu vodní páry a CO2</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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