High-Speed Video Analysis of the Process Stability in Plasma Spraying

Abstract In plasma spraying, instabilities and fluctuations of the jet have a significant influence on particle in-flight temperatures velocities, thus affecting coating properties. This work introduces new method to analyze stability jets using high-speed videography. An approach is presented, which digitally examines images determine size core. By correlating this with acquisition time, time-dependent signal generated. order evaluate jet, analyzed by calculating its coefficient variation c v . The validated measuring known difference in between single-cathode cascaded multi-cathode generator. For purpose, design experiment, covering variety parameters, conducted. To identify cause fluctuations, frequency spectra are obtained subsequently interpreted means fast Fourier transformation. quantify significance properties, single numerical parameter introduced. based fraction relevant range.