Powder-flow behavior and process mechanism in laser directed energy deposition based on determined restitution coefficient from inverse modeling
文献类型：期刊论文
| 作者 | Bian YH(边艳华); He XL(何秀丽) ; Yu G(虞钢); Li SX(李少霞); Tian CX(田崇鑫); Li ZY(李志永); Zhang YM(张艳梅); Liu JM
|
| 刊名 | POWDER TECHNOLOGY
 |
| 出版日期 | 2022-04-01 |
| 卷号 | 402页码:14 |
| 关键词 | Laser directed energy deposition Computational fluid dynamics Powder-flow behavior Restitution coefficient Inverse modeling |
| ISSN号 | 0032-5910 |
| DOI | 10.1016/j.powtec.2022.117355 |
| 通讯作者 | Hea, Xiuli(xlhe@imech.ac.cn) ; Yu, Gang(gyu@imech.ac.cn) |
| 英文摘要 | In order to clarify the transportation mechanism of particles in continuous coaxial powder feeding (CCPF) process, a trial-and-matching method is developed to quantify the restitution coefficient which is used to describe the inelastic collision between the particle and the nozzle wall. The consistency of the outlet velocity and the spatial concentration distribution of particles between the experimental statistic and the numerical calculation shows that the restitution coefficient of 0.9 can be used to measure the inelastic collision behavior between particles and the nozzle wall. Employing the determined restitution coefficient, a semi-quantitative method based on optical diagnostic and quantitative analysis derived from numerical calculation are proposed to study the powder-gas flow transport characteristics from single-layer to multi-layer jet flow. It is found that the outer shielding gas flow(OSGF) has a great influence on themulti-layer jet flow field, and it ismost conducive to powder focusing at the OSGF of 20 L/min. The velocity distribution of CGF determined by the inner structure of CCPFN and the inelastic collision between the particle and thewall are the twomutually coupled factors that determine the outlet velocity of particles. Frequent inelastic collisions and the decrease of the CGF velocity lead to velocity dispersion and trajectory fluctuation of particles. When the inlet velocity of particles is 1.33 m/s, the outlet velocity ranged from0.4m/s to 0.9m/s. This paper aims to provide a generalmethod to determine the restitution coefficient and offer a comprehensive understanding of transportation mechanism of power particles both inside continuous coaxial powder feeding nozzle (CCPFN) and multi-layer jet zone between substrate and the CCPFN outlet. (c) 2022 Elsevier B.V. All rights reserved. |
| 分类号 | 二类/Q1 |
| WOS关键词 | NUMERICAL-SIMULATION ; STREAM ; VELOCITY ; NOZZLES |
| 资助项目 | National Natural Science Foundation of China[11502269] ; National Natural Science Foundation of China[11672304] ; plan of Beijing Municipal Commission of Science and Technology[Z181100003818015] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000889298300001 |
| 资助机构 | National Natural Science Foundation of China ; plan of Beijing Municipal Commission of Science and Technology |
| 其他责任者 | He, Xiuli ; Yu, Gang |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/91065]  |
| 专题 | 宽域飞行工程科学与应用中心 |
| 推荐引用方式 GB/T 7714 | Bian YH,He XL,Yu G,et al. Powder-flow behavior and process mechanism in laser directed energy deposition based on determined restitution coefficient from inverse modeling[J]. POWDER TECHNOLOGY,2022,402:14. |
| APA | 边艳华.,何秀丽.,虞钢.,李少霞.,田崇鑫.,...&Liu JM.(2022).Powder-flow behavior and process mechanism in laser directed energy deposition based on determined restitution coefficient from inverse modeling.POWDER TECHNOLOGY,402,14. |
| MLA | 边艳华,et al."Powder-flow behavior and process mechanism in laser directed energy deposition based on determined restitution coefficient from inverse modeling".POWDER TECHNOLOGY 402(2022):14. |
入库方式： OAI收割
来源：力学研究所
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