铝合金颗粒低压冷喷涂喷嘴几何参数优化设计  

Optimization Design of Geometry Parameters of Low-Pressure Cold Spray Nozzle for Aluminium Particles

作　　者：乐咏琪 徐羽贞 李红军[1] 

机构地区：[1]浙江理工大学机械工程学院,浙江 杭州 [2]浙江省技术创新服务中心,浙江 杭州

出　　处：《建模与仿真》2023年第6期4905-4915,共11页Modeling and Simulation

摘　　要：因低压冷喷涂沉积精度较低,无法实现微细化喷涂,为提高其精度,本研究目标是优化其中常用的收缩–发散–直筒型喷嘴的几何结构参数,改善气流场状态,以获得更高质量的沉积。结果表明,喉部直径是影响颗粒速度的关键参数,较大的喉部直径可以产生更高的颗粒速度。此外,发散段长度和直筒段长度也会影响颗粒速度,需要优化选择,粉末的注入角度越小,颗粒的冲击速度越小,但角度超过60度以后,对颗粒的冲击速度影响不大。实验结果验证了喉部直径不应小于1.8 mm,否则无法形成有效的涂层。本文通过仿真和实验对低压冷喷涂喷嘴进行了几何参数优化,为进一步提高低压冷喷涂精度提供了参数设计指导。Due to the low deposition resolution of low-pressure cold spray, it is unable to achieve fine coating. To improve its accuracy, the aim of this study is to optimize the geometrical parameters of the commonly used convergent-divergent-straight nozzle to improve the gas flow field status for higher quality deposition. The results show that the throat diameter is the key parameter affecting particle velocity, and a larger throat diameter can generate higher particle velocity. In addition, the length of the divergent section and the straight section also affect particle velocity, and need to be opti-mized. The smaller the powder injection angle, the smaller the impact velocity of particles, but the impact on particle velocity is not significant when the angle exceeds 60 degrees. Experimental re-sults verify that the throat diameter should not be less than 1.8 mm, otherwise an effective coating cannot be formed. This paper optimizes the geometrical parameters of the low-pressure cold spray nozzle through simulation and experiments, providing parameter design guidance for further im-proving the accuracy of low-pressure cold spray.

关 键 词：低压冷喷涂 喷嘴几何结构 数值仿真 喷涂精度 

分 类 号：G63[文化科学—教育学]