Measurement of the Particle Velocity in a HVOF Spray with PIV Under Industrial Conditions

The particle velocity and the particle temperature are two of the most important parameters influencing the deposition process of high-velocity oxy-fuel (HVOF) spraying. This article addresses the application of particle image velocimetry to the measurement of the 2D particle velocity distribution in the flame of an industrial burner in a spraying booth under industrial conditions. Therefore, the measurement equipment has to be protected from overspray. Moreover, the low particle number density of HVOF sprays requires a technique called average correlation for image evaluation. The effect of the variation of process parameters, such as oxygen flow rate and mass loading of the flame, on the particle velocity is discussed.