Abstract Cold Spray(CS) is an emerging process, attracting much interest both as a coating and additive technique due to its solid-state nature and high deposition rates. The key element of any CS apparatus is the supersonic nozzle. The work presented here, for the first time, will explore in detail the relationship between particle flow, and its acceleration in the nozzle using Computational Fluid Dynamics and experimental measurements obtained with a Particle Tracking Velocimetry apparatus. We have developed modelling parameters capable to accurately predict the particle flow exit speed and space distribution, leading to considerably improved nozzle performances.

中文翻译：

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颗粒流动特性对冷喷嘴性能的影响

摘要 冷喷涂 (CS) 是一种新兴工艺，由于其固态性质和高沉积率，作为涂层和添加剂技术引起了广泛关注。任何 CS 设备的关键要素是超音速喷嘴。这里介绍的工作将首次使用计算流体动力学和粒子跟踪测速仪获得的实验测量详细探讨粒子流与其在喷嘴中的加速度之间的关系。我们开发了能够准确预测粒子流出口速度和空间分布的建模参数，从而大大提高了喷嘴性能。