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Resonant Excitation of Boundary Layer Instability of DC Arc Plasma Jet by Current Modulation
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SYSNO ASEP 0367145 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Resonant Excitation of Boundary Layer Instability of DC Arc Plasma Jet by Current Modulation Tvůrce(i) Kopecký, Vladimír (UFP-V) RID
Hrabovský, Milan (UFP-V) RIDZdroj.dok. Plasma Chemistry and Plasma Processing. - : Springer - ISSN 0272-4324
Roč. 31, č. 6 (2011), s. 827-838Poč.str. 12 s. Forma vydání web - web Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova dc arc jet ; plasma jet oscillations ; boundary layer instability ; frequency spectra Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech CEP GAP205/11/2070 GA ČR - Grantová agentura ČR CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000300101200003 DOI 10.1007/s11090-011-9317-0 Anotace Instabilities of thermal plasma jets were studied on the basis of analysis of plasma radiation fluctuations recorded by an array of high frequency photodiodes. Characteristic frequencies of jet oscillations were found and spatial distribution of amplitude of plasma fluctuations was determined. The influence of arc current ripple on plasma instabilities was investigated for two types of power supply - classical thyristor controlled unit with the frequency of the current ripple 300 Hz and the rectifier with the high frequency converter and frequency of the current modulation 30 kHz. Generation of boundary layer instability with the current modulation frequency and its harmonics was proved using fast Fourier transform, contour plots and phase portraits. It was found that the character of fluctuations of plasma jet was substantially influenced by current ripple with the frequency or its harmonics close to the frequency of oscillations generated by boundary layer instability. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2012
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