Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 20, Issue 4, Pages 837-844Publisher
SPRINGER
DOI: 10.1007/s11666-011-9621-5
Keywords
cold spray; deposition efficiency; nozzle; oblique cut; two-phase flow swirling
Categories
Funding
- Russian Foundation for Basic Research [08-01-00108a, 09-08-00543a]
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Traditionally, in cold spray two-phase supersonic jet formed with the help of converging-diverging nozzle are used. In this study an alternative design of cold spray nozzle is proposed in which a high velocity two-phase flow is created using an intense flow swirling in a constant section barrel (cylinder) with double-edged bevel exit. As a result, a high velocity gas-powder mixture jet is produced presenting a fan-shaped jet spreading at a large angle in one plane and approximately of equal size along the normal to this plane. This results in greater angles of particle deposition and, hence, in larger deposition widths, with the maximum width of deposition spot reaching 25 barrel diameters. The performed experimental study proves the new nozzle design to be appropriate for deposition of cold-sprayed coatings.
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