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【封面文章】南京林业大学杨雨图副教授等:轨道客车高压无气喷涂腻子雾化与表面成膜模拟

  • 2026-05-09 13:44:02
【封面文章】南京林业大学杨雨图副教授等:轨道客车高压无气喷涂腻子雾化与表面成膜模拟

近日,南京林业大学杨雨图副教授等在《表面技术》发表了题为《轨道客车高压无气喷涂腻子雾化与表面成膜模拟》的封面文章,杨雨图副教授为通信作者,杨策为第一作者。

2026年3月

第55卷第6期

Vol. 55 No. 6

摘要

目的 建立高压无气喷涂雾化与表面成膜模型,研究不同工艺参数下的腻子雾化效果以及轨道客车白车身复杂形面的喷涂表面成膜特性,为自动喷涂轨迹规划提供理论指导,以提高轨道客车白车身自动喷涂的效率与涂层质量。方法Fluent中构建VOF-DPM耦合多尺度模型,引入网格自适应与VOF-to-DPM转换机制;先以VOF解析初次破碎并结合高速摄影标定扇面形貌与粒径分布,再将转换区划分为多个长方体采样区提取颗粒数量、粒径与质量流率,基于分区数据构建多雾化器DPM模型,模拟不同轨迹规划策略下不同特征形面的成膜,并兼顾计算成本与精度。结果 模拟雾化形貌与高速摄影实验数据高度吻合;增高压力、降低黏度可显著扩大喷雾扇幅、加速雾化并细化粒径。在喷涂压力25 MPa、腻子黏度0.32 kg/(m·s)的高压低黏工艺参数下,喷雾扇面完全展开并使破碎前移,喷雾成膜在各形面沿扇面展开方向呈“两侧高-中间低”的双峰分布;距平面300 mm喷涂时,轨迹间隔200 mm兼顾最大涂覆范围与膜厚均匀性,间隔过小致过度重叠、过大致两道分离;V形面宜沿母线移动喷涂,而曲面沿准线喷涂更优。结论构建的高压无气喷涂雾化与表面成膜模型能够准确预测无气喷涂腻子的雾化与表面成膜过程,工艺参数对雾化效果起决定性作用,而喷涂轨迹策略则显著影响膜厚分布与均匀性。

结论

研究从CFD理论入手,构建VOF-DPM的耦合模型对轨道客车腻子高压无气喷涂雾化与成膜进行模拟预测。VOF模型准确预测了工艺参数与雾化效果间的映射关系,并使用高速摄影技术进行了实验验证;基于VOF-to-DPM转换机制的多雾化器DPM模型解析了特定工艺参数与喷涂轨迹策略下不同特征形面的成膜行为。研究结果表明,喷涂压力与腻子黏度显著影响喷涂雾化效果,而轨迹规划策略对于不同形面的成膜与涂层质量控制具有较大影响

1)喷涂雾化模拟结果反映出压力主要决定喷雾是否充分破碎与横向展开,黏度主要决定喷雾束缚程度与核心长度。二者的组合直接决定了无气喷涂的雾化细度、覆盖宽度与可控性。

2)高速摄影采集到的图像显示高压低黏的工艺参数定义了细雾化的上限形态,喷涂覆盖范围最广,雾化细度最高,但需要控制喷枪移动速度以及与工件表面的距离,以减少壁面冲击导致的颗粒飞溅。高压中黏或高黏适用于工件表面缺陷如凹坑、焊缝的补平,但需要控制喷距以避免涂层流挂。

3)综合考虑各工艺参数组合,建议采用喷涂压力25 MPa、腻子黏度0.32 kg/(m·s)、喷距300 mm、喷枪移动速度2 m/s、轨迹间距200 mm这一工况进行喷涂作业。在该工况下,数值模拟得到的平面涂层平均膜厚约为50 μm,波动范围为±10 μm,单道涂层宽度为205 mm,呈“两侧高、中间低”的双峰分布;而平面喷涂试验测得的平均膜厚为41.56 μm47.17 μm42.66 μm与模拟相对误差不超过15%,涂层宽度为224.90 mm218.16 mm220.94 mm与模拟相对误差不超过10%

4)喷涂成膜模拟表明,高压无气喷涂在不同形面上直线喷涂成膜具有两侧高中间低的双峰特征;喷涂轨迹间距影响涂层搭接程度和两轨迹涂层的覆盖范围,进而影响整个车体喷涂涂层的厚度、均匀度与喷涂效率,因此在喷涂时需要根据涂层要求,合理增减轨迹间距与移动速度;对于V形面、曲面等典型的特征形面,应采取不同的喷涂方向,但应与整体轨迹保持一致。

5)研究针对动态成膜进行了模拟,而在进一步对本课题进行研究时,需要考虑诸如喷枪移动速度、喷枪角度以及其他重要工艺参数对成膜的影响,同时可将工艺参数以及膜厚分布与轨迹规划策略耦合,优化喷涂轨迹规划算法。

图文赏析

高压无气喷涂雾化-成膜模拟
不同工艺参数下的喷涂雾化速度云图
曲面移动喷涂膜厚

引文格式:

杨策, 霍林涛, 夏海飞, 等. 轨道客车高压无气喷涂腻子雾化与表面成膜模拟[J]. 表面技术, 2026, 55(6): 175-186.

YANG Ce, HUO Lintao, XIA Haifei, et al. Atomization and Surface Film Formation of Putty in Airless Spraying of Rail Coaches[J]. Surface Technology, 2026, 55(6): 175-186.

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  1. CONNECT:[ UseTime:0.000910s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001420s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000294s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000246s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000533s ]
  8. SELECT * FROM `article` WHERE `id` = 541842 LIMIT 1 [ RunTime:0.000363s ]
  9. UPDATE `article` SET `lasttime` = 1779335156 WHERE `id` = 541842 [ RunTime:0.000562s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000239s ]
  11. SELECT * FROM `article` WHERE `id` < 541842 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000400s ]
  12. SELECT * FROM `article` WHERE `id` > 541842 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000405s ]
  13. SELECT * FROM `article` WHERE `id` < 541842 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000912s ]
  14. SELECT * FROM `article` WHERE `id` < 541842 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001072s ]
  15. SELECT * FROM `article` WHERE `id` < 541842 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000811s ]
0.153915s