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| Analysis of flow field and particle characteristics of atmospheric plasma spraying |
| ZHANG Yong，GUO Longlong，JU Luyan，WU Heng |
| （College of Mechanical Engineering, Xi 'an petroleum university, Xi’an 710000, China） |
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Abstract The thermal swimming force and pressure gradient force of particles in the process of plasma spraying
were considered, and the flow field distribution and particle characteristics in the process of atmospheric plasma
spraying were studied. The results show that in pure argon, the maximum temperature of atmospheric plasma spray‐
ing flow field is 14 000 K, and the maximum velocity is 470 m/s. The maximum temperature of flow field under ar‐
gon-hydrogen mixing condition is 30% higher than that under pure argon condition. The temperature field is not
symmetrical along the Z axis, but humped. When the carrier gas flow rate is 5 L/min, the particles can be sent into
the center of the plasma jet to obtain sufficient kinetic energy and thermal energy of the flow field. With the in‐
crease of carrier gas flow, particles pass through the flow field. When the carrier gas flow rate is 3 L/min, the parti‐
cles fly above the plasma fluid, which is not conducive to heating acceleration. In pure argon, the maximum veloci‐
ty of the particles reaches 271 m/s and the maximum temperature is 4 000 K. In this paper, the optimal spraying dis‐
tance is 80 mm.
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Received: 06 March 2023
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2024, Vol. 34 
