Interaction of particles with carrier gas in HVOF spraying systems |
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Authors: | E Kadyrov Y Evdokimenko V Kisel V Kadyrov F Worzala |
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Affiliation: | (1) Materials Science Program, University of Wisconsin-Madison, 53706 Madison, WI, USA;(2) Research Institute of Materials Science, Ukrainian Academy of Sciences, Kiev, Ukraine |
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Abstract: | Several designs of high-velocity oxygen fuel (HVOF) thermal spray systems have been created during the last decade. The most
advanced systems are now producing coatings comparable in quality to detonation (D-gun) coatings. This paper presents numerical
analysis of the interaction of dispersive particles with the carrying gas flow for three different HVOF systems, along with
a method to calculate the parameters of sprayed particles that highlights the advantages and limitations of each design. The
method includes gas dynamical calculations of the gas flow in an accelerating channel and calculations of the injected par-motion
and thermal state (temperature and melted mass fraction). The calculations were performed for particles of tungsten carbide,
aluminum oxide, and zirconium oxide with size distributions of 10 to 80 μm. Two conventional types of HVOF systems were considered:
those with a supersonic accelerating channel and those with a subsonic accelerating channel (without a de Laval nozzle). A
novel design is pro-posed that contains a combined gas dynamical path with functionally separated regions of heating and acceleration.
The regularities and distinctions in the behavior of the metallic and ceramic oxide particles are discussed for different
jet configurations. The results obtained indicate that it is possible to signifi-cantly affect particle parameters by using
the new configuration solutions without creating construction complications. |
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Keywords: | de Laval nozzle gas dynamics high-velocity oxygen fuel particle kinetic energy particle temperature |
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