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Resonant Excitation of Boundary Layer Instability of DC Arc Plasma Jet by Current Modulation

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Abstract

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.

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Acknowledgments

The authors gratefully acknowledge support of the Grant Agency of CR under the project number P202/11/2070.

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Authors and Affiliations

  1. Institute of Plasma Physics v. v. i., Academy of Sciences of the Czech Republic, Za Slovankou 3, 182 00, Prague 8, Czech Republic

    V. Kopecky & M. Hrabovsky

Authors
  1. V. Kopecky
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  2. M. Hrabovsky
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Correspondence to M. Hrabovsky.

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Kopecky, V., Hrabovsky, M. Resonant Excitation of Boundary Layer Instability of DC Arc Plasma Jet by Current Modulation. Plasma Chem Plasma Process 31, 827–838 (2011). https://doi.org/10.1007/s11090-011-9317-0

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  • DOI: https://doi.org/10.1007/s11090-011-9317-0

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