Measurements of size and velocity characteristics in plasma spraying process using PDA
Phase doppler anemometry (PDA) has been considered a powerful technique for investigating in-flight powder behavior in the plasma spraying process, since it can simultaneously and non-intrusively measure the velocity and the distributions of particle sizes. In order to enhance measurement accuracy in its application to the plasma spraying process, properties of the light scattered from spherical metal particles were studied and analyzed in detail with the aid of Mie theory. The optimum optical settings used in the Dual Mode PDA system (58N81 DualPDA Dantec Measurement Technology) for this process are discussed. Measurements at 5cm and 10cm below the SG-100 (Miller) plasma gun are obtained and illustrated. In this study, only one particle injection port was used. It was observed that there was a correlation between particle size and velocity inside the plasma spray as well as a correlation between particle size and RMS velocity. Two flux concentration peaks were found to exist at the cross section 10cm below the nozzle.
In-flight powder behavior; Phase doppler anemometry (PDA); Plasma spraying
Aerodynamics and Fluid Mechanics | Engineering
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Yu, S. C.,
Ng, H. W.,
Lam, C. Y.
Measurements of size and velocity characteristics in plasma spraying process using PDA.
32nd AIAA Plasmadynamics and Lasers Conference
American Institute of Aeronautics and Astronautics.