Effects of arc current modulation on dominant oscillations in plasma jet

Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Effects of arc current modulation on dominant oscillations in plasma jet
Original language description
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.
Czech name
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Czech description
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
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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Number of pages
4
Pages from-to
418-421
Publisher name
University of Orleans
Place of publication
Orleans
Event location
Orleans
Event date
Jul 6, 2014
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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