Title :
Suppression of Instabilities in Thermal Plasma Jet by Additional Arc Current Modulation
Author :
HliÌna, Jan ; Gruber, Jan ; SÌŒonskyÌ, JiriÌ
Author_Institution :
Inst. of Thermomech., Prague, Czech Republic
Abstract :
Arc current in a dc thermal plasma torch was modulated by superimposed ac current with frequency 15 kHz. The plasma jet optical radiation was recorded by a matrix of fast photodiodes. The analysis of records using standard deviations and 3-D phase portraits has shown that the fluctuations in the plasma jet in the frequency range under 5 kHz were suppressed.
Keywords :
arcs (electric); plasma diagnostics; plasma fluctuations; plasma instability; plasma jets; plasma torches; 3D phase portraits; ac current; arc current; arc current modulation; dc thermal plasma torch; frequency 15 kHz; frequency 5 kHz; photodiodes; plasma jet optical radiation; standard deviations; thermal plasma jet; Frequency modulation; Oscillators; Plasmas; Stability analysis; Standards; Thermal stability; Arc current modulation; Fourier transform; phase portrait; plasma torch; stability; stability.;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2014.2330740
