On the gas dynamics of HVOF thermal sprays |
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Authors: | C M Hackett G S Settles J D Miller |
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Affiliation: | (1) Gas Dynamics Laboratory, Mechanical Engineering Department, Penn State University, 16802 University Park, PA, USA |
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Abstract: | An experimental study of the gas-dynamic aspects of the high-velocity oxyfuel (HVOF) thermal spray process has been performed
using commercially available HVOF equipment (Hobart-Tafa JP-5000, Ho-bart-Tafa Technologies, Inc., Concord, NH). Optical diagnostic
techniques, including microsecond-expo-sure schlieren and shadowgraph imaging, were applied to visualize the hot supersonic
jet produced by this equipment without particle injection. Rapid turbulent mixing of the jet with the surrounding atmos-phere
was observed, which is an issue of concern in coating quality due to the possibility of oxidation of sprayed particles. This
mixing appears to be a function of the ratio of densities of the hot jet and the cold atmosphere as well as a function of
the velocity of the jet, rather than one of combustion-chamber pres-sure or barrel length. The supersonic core of the HVOF
jet dissipates rapidly due to the mixing, so that the jet is no longer supersonic when it impinges on the target surface being
sprayed. Secondary issues also observed in this study include strong jet-noise radiation from the HVOF plume and the entrainment
and induced bulk motion of the surrounding air. |
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Keywords: | gas dynamics jet flows turbulent mixing HVOF |
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