曹聪聪,李文亚,韩天鹏,等.冷喷涂喷嘴材料对粒子加速行为影响的模拟研究[J].精密成形工程,2019,11(6):149-153.
CAO Cong-cong,LI Wen-ya,HAN Tian-peng,et al.Simulation Study on Effect of Cold Spray Nozzle Material on Particle Acceleration Behavior[J].Journal of Netshape Forming Engineering,2019,11(6):149-153. |
| 冷喷涂喷嘴材料对粒子加速行为影响的模拟研究 |
| Simulation Study on Effect of Cold Spray Nozzle Material on Particle Acceleration Behavior |
| 投稿时间：2019-09-05 修订日期：2019-11-10 |
| DOI：10.3969/j.issn.1674-6457.2019.06.022 |
| 中文关键词: 冷喷涂 喷嘴 数值模拟 加速行为 |
| 英文关键词: cold spraying nozzle numerical simulation acceleration behavior |
| 基金项目:国家自然科学基金（51875471）；凝固技术国家重点实验室自主课题（2019-QZ-01） |
|
| 摘要点击次数: 3550 |
| 全文下载次数: 2288 |
| 中文摘要: |
| 目的 研究冷喷涂过程中喷嘴材料对粒子加速行为的影响。方法 建立喷嘴内外壁的几何模型，设定喷嘴几何尺寸及边界条件，划分喷嘴入口、收缩段、喉部及扩张段的网格，采用模拟软件Fluent 14.5进行模拟分析。结果 在冷喷涂过程中，喷嘴内部包含高温气体、室温粒子流及喷嘴内壁的热交换，导热系数最低的喷嘴材料（陶瓷）的喷嘴内壁温度最低，气流和粒子的热损失最小，粒子的速度略高（441 m/s）；导热系数最高的纯铜喷嘴内壁温度最高，有利于粒子温度提升，因此粒子的温度最高，从而促进粒子塑性变形，改善沉积效果，然而温度过高的内壁会因粒子粘附导致喷嘴堵塞。结论 数值模拟方法可以用来研究喷嘴内外壁的传热行为，为喷嘴材料的选择做理论指导，通过综合考虑喷嘴材料的选择和使用来优化喷嘴设计。 |
| 英文摘要: |
| The paper aims to investigate the effect of nozzle material on particle acceleration behavior during cold spray. The geometric model of the nozzle was established, and geometric dimension and boundary conditions of the nozzle was set. The inlet, convergent section, throat, divergent section of nozzle was divided in to small meshes. Subsequently, the simulation software Fluent 14.5 was used for simulation analysis. The results show that the heat exchange happened among gas with high temperature, particle flow with room temperature, and nozzle wall in the cold spray. The inner wall of ceramic nozzle had the lowest temperature, because its thermal conductivity was the lowest. Hence, the heat loss of gas flow and the particle was the smallest, and the velocity of particles was slightly high (441 m/s). The inner wall of copper nozzle had the highest temperature, which was conducive to the improvement of particle temperature. Therefore, the temperature of particles was the highest. And the particle with high temperature can easily produce plastic deformation, improving the deposition effect of particles. However, the inner wall with too high temperature caused the nozzle blockage because that the particles adhered on the inner wall of nozzle. In summary, the numerical simulation method can be used to study the heat transfer behavior of the inner and outer walls of the nozzle, which can provide theoretical guidance for the selection of nozzle materials. Hence，the nozzle design can be optimized by comprehensively considering the selection and use of nozzle materials. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501719号