用于激光金属沉积的离散喷嘴的 CFD 和射线追踪分析

IF 1.9 3区 工程技术 Q3 MECHANICS Meccanica Pub Date : 2024-09-10 DOI:10.1007/s11012-024-01876-1
Jon Lambarri, Jon Gabirondo-López, Telmo Echániz, Silvio Schmalfuß, Maria José Tobar
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引用次数: 0

摘要

吹粉激光金属沉积(p-LMD)是一种先进的增材制造技术,它通过使用高功率激光源将金属粉末颗粒与基体熔化来制造金属部件。本研究采用创新的三步 CFD 射线跟踪模型,探索了 p-LMD 过程中三通道喷嘴配置内激光能量、粉末流动和气体动力学之间的相互作用。实验技术包括用于粉末特征描述的扫描电子显微镜、用于发射率校准的辐射测量法、用于气体流速测量的皮托管风速测量法和用于颗粒速度测量的颗粒图像测速法,这些技术对模型进行了校准和验证。该研究采用光线追踪技术,评估了在 LMD 过程中反射光和散射光对粉末云所见有效激光场的影响。重要发现包括确定了对相互作用体积进行有效屏蔽的最佳气体流速,以及不同质量流量对激光束衰减和粒子加热的影响。
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CFD and ray tracing analysis of a discrete nozzle for laser metal deposition

Blown powder laser metal deposition (p-LMD) is an advanced additive manufacturing technique that creates metal components by fusing metal powder particles with a substrate using a high-power laser source. This study explores the interactions between laser energy, powder flow, and gas dynamics within a three-channel nozzle configuration for a p-LMD processes, using an innovative three-step CFD–ray tracing model. Experimental techniques, including scanning electron microscopy for powder characterisation, radiometry for emissivity calibration, Pitot tube anemometry for gas flow velocity, and particle image velocimetry for particle velocity measurements, calibrate and validate the model. Employing ray tracing, the study evaluates the consequences of reflected and scattered light on the effective laser field seen by the powder cloud during the LMD process. Significant findings include the identification of optimal gas flow rates for effective shielding of the interaction volume and the impact of varying mass flow rates on laser beam attenuation and particle heating.

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来源期刊
Meccanica
Meccanica 物理-力学
CiteScore
4.70
自引率
3.70%
发文量
151
审稿时长
7 months
期刊介绍: Meccanica focuses on the methodological framework shared by mechanical scientists when addressing theoretical or applied problems. Original papers address various aspects of mechanical and mathematical modeling, of solution, as well as of analysis of system behavior. The journal explores fundamental and applications issues in established areas of mechanics research as well as in emerging fields; contemporary research on general mechanics, solid and structural mechanics, fluid mechanics, and mechanics of machines; interdisciplinary fields between mechanics and other mathematical and engineering sciences; interaction of mechanics with dynamical systems, advanced materials, control and computation; electromechanics; biomechanics. Articles include full length papers; topical overviews; brief notes; discussions and comments on published papers; book reviews; and an international calendar of conferences. Meccanica, the official journal of the Italian Association of Theoretical and Applied Mechanics, was established in 1966.
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