Effects of arc current modulation on dominant oscillations in plasma jet

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F14%3A00443419" target="_blank" >RIV/61388998:_____/14:00443419 - 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

Effects of arc current modulation on dominant oscillations in plasma jet

Popis výsledku v původním jazyce

Stability phenomena and time constants of instabilities in thermal plasma jets are essential in thermal plasma applications. We present observation of a thermal plasma jet generated by DC (direct-current) argon plasma torch by 8x15 matrix of fast photodiodes. The arc current was intentionally modulated in intervals 0.25 s long interposed by unmodulated gaps of the same length. Record of plasma radiation was analyzed by Fourier transform yielding spatial distribution of oscillations at selected frequencyintervals. Results show that the oscillations present during unmodulated part in some frequency intervals are suppressed in the modulated part of the record. Suppression of oscillations depends on the location in the jet. It is strongest near nozzle orifice and weakest in the shear layer for frequencies lower than the modulation frequency. Suppressed higher frequencies show opposite spatial characteristics.

Název v anglickém jazyce

Effects of arc current modulation on dominant oscillations in plasma jet

Popis výsledku anglicky

Stability phenomena and time constants of instabilities in thermal plasma jets are essential in thermal plasma applications. We present observation of a thermal plasma jet generated by DC (direct-current) argon plasma torch by 8x15 matrix of fast photodiodes. The arc current was intentionally modulated in intervals 0.25 s long interposed by unmodulated gaps of the same length. Record of plasma radiation was analyzed by Fourier transform yielding spatial distribution of oscillations at selected frequencyintervals. Results show that the oscillations present during unmodulated part in some frequency intervals are suppressed in the modulated part of the record. Suppression of oscillations depends on the location in the jet. It is strongest near nozzle orifice and weakest in the shear layer for frequencies lower than the modulation frequency. Suppressed higher frequencies show opposite spatial characteristics.

Druh

D - Stať ve sborníku

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název statě ve sborníku

International Conference on Gas Discharges and their Applications /20./

ISBN

978-2-9548207-3-6

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

418-421

Název nakladatele

University of Orleans

Místo vydání

Orleans

Místo konání akce

Orleans

Datum konání akce

6. 7. 2014

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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