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Title | Study of a cold spray nozzle throat on acceleration characteristics via CFD |
Authors |
Hu, W.J.
Tan, K. Markovych, S. Liu, X.L. |
ORCID | |
Keywords |
cold spray technology nozzle acceleration characteristics particle trajectory |
Type | Article |
Date of Issue | 2021 |
URI | https://essuir.sumdu.edu.ua/handle/123456789/84370 |
Publisher | Sumy State University |
License | Creative Commons Attribution - NonCommercial 4.0 International |
Citation | Hu W. J., Tan K., Markovych S.., Liu X. L. (2021). Study of a cold spray nozzle throat on acceleration characteristics via CFD. Journal of Engineering Sciences, Vol. 8(1), pp. F19–F24, doi: 10.21272/jes.2021.8(1).f3 |
Abstract |
Cold spray technology can obtain coatings in a solid state, suitable for deposition protection, repair, and
additive manufacturing. In order to further expand the application areas of cold spraying nozzles, especially the inner
surface of the components or areas where a Straight-line conical nozzle cannot be applied, because the study of the
throat of the nozzle with the angle will directly reduce the total length of the nozzle (the horizontal direction), hence,
the spray with the angle will show its advantage. This study discusses the influence of the throat structure of the conical
cold spray nozzle on the acceleration characteristics, including the throat’s size, length, and angle. The results show the
following. Firstly, under the premise of keeping the shrinkage ratio and divergence ratio unchanged at normal
temperature, the throat diameter is between 2–6 mm in size, and the maximum growth rate exceeds 20 m/s. When the
throat exceeds 6mm, the growth rate of the outlet slows down, and the growth rate is only 8 m/s. Secondly, the length
of the throat has little effect on the acceleration characteristics, the total range fluctuated from 533 to 550 m/s, and
11 mm length of the throat is the closest to 0mm. Additionally, the 90° throat angle has the least effect on the
acceleration characteristics. Finally, the particle trajectory is affected by inlet pressure, injection pressure, particle size,
and other factors. |
Appears in Collections: |
Journal of Engineering Sciences / Журнал інженерних наук |
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