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The International Journal of Advanced Manufacturing Technology

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24-05-2021 | ORIGINAL ARTICLE

Numerical simulation and experimental investigation on powder transport of a new-type annular coaxial nozzle

Authors: Yelin Xia, Zhaozhen Huang, Hanning Chen, Xiaodan Liang, Jianbo Lei

Published in: The International Journal of Advanced Manufacturing Technology | Issue 7-8/2021

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Abstract

The annular coaxial nozzle has good convergence and is widely used in laser melting deposition (LMD). In this paper, a new-type annular coaxial nozzle is developed, which can transform four-channel powder flow into annular distribution through the internal channel to obtain a more uniform distribution of powder in the circumferential direction. A three-dimensional computational fluid dynamics (CFD) numerical model is established. The dynamic behavior of Fe-based powder is described by discrete phase model (DPM). The influence of gas on powder particles is described by two-way turbulence coupling model. The convergence and transport characteristics of the nozzle are revealed. The accuracy of CFD model is verified by powder feeding experiment, and the deposition performance of powder nozzle is verified by single-track deposition experiment. The results show that the nozzle can provide stable powder feeding and excellent convergence characteristics. The powder flow is converged in a “Y” shape on the longitudinal section. The higher the powder concentration at the focal plane of the nozzle, the smaller the aspect ratio of single-track coating. The powder utilization rate of the nozzle can reach 76.97%.

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Title: Numerical simulation and experimental investigation on powder transport of a new-type annular coaxial nozzle
Authors: Yelin Xia
Zhaozhen Huang
Hanning Chen
Xiaodan Liang
Jianbo Lei
Publication date: 24-05-2021
Publisher: Springer London
Published in: The International Journal of Advanced Manufacturing Technology / Issue 7-8/2021
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI: https://doi.org/10.1007/s00170-021-07294-x

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