基于动态边界的变曲率叶片激光熔覆数值研究  

Simulation of Laser Cladding of Aero-engine Blades Based on Dynamic Boundary Condition

作　　者：郭凯[1,2] 赵元 程雨轩 张红升 曹丽琴[2] Guo Kai;Zhao Yuan;Cheng Yuxuan;Zhang Hongsheng;Cao Liqin(Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse,Yanshan University,Qinhuangdao,Hebei 066004,China;School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]燕山大学河北省水体重金属修复与资源利用重点实验室,河北秦皇岛066004 [2]燕山大学环境与化学工程学院,河北秦皇岛066004

出　　处：《应用激光》2022年第7期43-51,共9页Applied Laser

摘　　要：为了提高激光熔覆修复航空发动机变曲率失效叶片的数值模拟精度,及时准确地辨识出误差,提出了基于动态边界条件的修复过程加载区域方法。首先依据变曲率失效叶片建立了复原度更高的叶片有限元模型,以保证所建模型能够反映变曲率失效叶片在修复中的真实状态;其次利用所提方法进行了激光熔覆修复变曲率失效叶片的热-应力场模拟计算,用以提取实时工况数据来实现工艺参数对结果影响的定量化研究;最后分析了激光参数和工艺参数对变曲率叶片温度场和应力场的影响规律。结果表明,在激光扫描速度前后取值成比例增加时,变曲率叶片前后熔池温度相差值在500℃附近;合适的道间冷却时间可大幅降低变曲率叶片熔池温度,但是对应力场影响不大。In order to improve the accuracy of numerical simulation of laser cladding repairing aero-engine variable-curvature failure blades and to identify errors in a timely and accurate manner, a method of loading area in the repair process based on dynamic boundary conditions is proposed. Firstly, a blade finite element model with a higher degree of restoration was established based on the variable-curvature failed blade to ensure that the model can reflect the true state of the variable-curvature failed blade during repair. Secondly, the proposed method was used to repair the variable-curvature failure by laser cladding. The thermal-stress field simulation calculation of the blade is used to extract real-time working condition data to realize the quantitative study of the influence of process parameters on the results. Finally, the influence of laser parameters and process parameters on the temperature field and stress field of the variable curvature blade is analyzed separately. Results show that when the values before and after the laser scanning speed increase proportionally, the difference between the melt pool temperature before and after the variable curvature blade is around 500 ℃. The appropriate cooling time between passes can greatly reduce the melt pool temperature of the variable curvature blade, but it has small impact on the stress field.

关 键 词：变曲率叶片 激光参数 工艺参数 熔池温度 应力 

分 类 号：O436[机械工程—光学工程]