预热温度对火焰筒激光沉积质量影响的数值模拟研究
Numerical Simulation of Influence of Preheating Temperature on Laser Deposition Quality in Flame Tube
张莹 1梁帅 1罗睿敏2
作者信息
- 1. 中国民航大学,天津 300300
- 2. 中国民航大学,天津 300300;中国商飞民用飞机试飞中心,上海 200232
- 折叠
摘要
航空发动机火焰筒极易出现各类损伤,因此研究其修复技术具有重要意义.为研究预热温度对激光沉积修复火焰筒内壁质量的影响,使用某有限元分析软件对火焰筒模型进行了顺序热力耦合数值模拟.结果表明,预热基体可以有效减小残余应力的分布范围,并消除局部应力集中现象;预热后基体表面的残余应力峰值升高,分布范围增大,但局部应力集中现象减少;沉积层周围沿径向方向的残余应力峰值降低,沿径向方向残余应力随距离减小.通过研究不同预热温度下火焰筒模型激光沉积后的残余应力,得到火焰筒激光沉积修复的最佳预热温度为300℃,为实际修复过程提供了预热温度参考.
Abstract
The flame cylinder of aeroengine is prone to various kinds of damage,so it is of great significance to study its repair technology.In order to study the effect of preheating temperature on the inner wall quality of flame tube repaired by laser deposition,a finite element analysis software was used to conduct sequential thermal coupling numerical simulation of flame tube model.The results show that preheating matrix can effectively reduce the distribution range of residual stress and eliminate the phenomenon of local stress concentration.After preheating,the peak value of residual stress on the surface of the matrix increases,the distribution range increases,but the local stress concentration decreases.The peak value of residual stress along the radial direction decreases,and the residual stress along the radial direction decreases with the distance.By studying the residual stress after laser deposition of flame tube model at different preheating temperatures,the optimal preheating temperature for laser deposition repair of flame tube is 300℃,which provides a reference for the preheating temperature in the actual repair process.
关键词
火焰筒/激光沉积/数值模拟/预热/残余应力场Key words
flame tube/laser deposition/numerical simulation/preheat/residual stress field引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据