Abstract
High-velocity oxygen fuel thermal spraying is widely used in industrial production, and coating hardness and density are closely related to the flight velocity of particles. In this study, the particle image velocimetry method was used to evaluate the velocity of particles produced by a JP5000 spray gun. The spraying parameters (total flow rate and equivalence ratio) on particle velocity and flight angle were studied. Both the total flow rate and equivalence ratio had effects on the particle velocity; however, the total flow rate demonstrated a greater effect. In the free jet state, the variation trend of particle velocity on the centerline exhibited a rapid increase, deceleration at 13 mm, and undulating rise to the maximum velocity before a linear decrease. The axial position of the maximum velocity increased with increasing total flow rate. In the impinging jet state, the particle velocity reached a maximum value at axial distance 13 mm from the nozzle exit (when total flow rate changed from 0.0199 to 0.0273 kg/s), and then decreased slowly, with a rapid decrease before 10 mm from the substrate. This study on particle velocity can provide guidance for optimization of the spraying process.
Original language | English |
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Pages (from-to) | 2147-2156 |
Number of pages | 10 |
Journal | Journal of Thermal Spray Technology |
Volume | 31 |
Issue number | 7 |
DOIs | |
Publication status | Published - Oct 2022 |
Keywords
- JP5000
- free jet
- high-velocity oxygen fuel
- impinging jet
- particle image velocimetry
- particle velocity
- thermal spray