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航空发动机叶片MPAW修复传热建模及冷却方法
龚淼1, 戴士杰1, 贾鹏2, 王冬1
1.河北工业大学 河北省机器人感知与人机融合重点实验室, 天津 300130;2.中国民航大学 天津市民用航空器适航与维修重点实验室, 天津 300300
摘要:
热源参数和冷却速度是影响钛合金叶片焊接修复质量的关键因素.基于脉冲热源叠加原理和高斯分布特性,建立了焊接热源的数学模型,根据夹具实体结构建立了焊接修复有限元模型,通过COMSOL进行传热过程建模,并通过试验对热源模型进行了验证.根据传热仿真结果分析了夹具的传热特性,设计了夹具的冷却结构和流体参数.通过建立典型位置的参数化表面,对比分析了采用冷却方法之后最高温度变化情况并进行了焊接试验.结果表明,热源模型与实际吻合度较好,采用的换热方法可有效提升焊接修复效果.
关键词:  叶片修复  传热建模  冷却方法  脉冲等离子弧焊  热流耦合
DOI:10.12073/j.hjxb.2019400176
分类号:TG456.2
基金项目:国家自然基金委员会与中国民用航空局联合基金(U1433117);中国民航科技重大专项(MHRD20130104)
Heat transfer modeling and cooling method for aeroengine blade MPAW repair
GONG Miao1, DAI Shijie1, JIA Peng2, WANG Dong1
1.Hebei Key Laboratory of Robot Sensing and Human-Pobot Interaction, Hebei University of Technology, Tianjin 300130, China;2.Tianjin Key Laboratory for Airworthiness and Maintenance of Civil Aviation, Civil Aviation University of China, Tianjin 300300, China
Abstract:
Heat source parameters and cooling rate are the key factors affecting the repairing welding quality of titanium alloy blade. In the present work, the mathematical model of welding heat source is established based on the principle of pulse heat source superposition and Gaussian distribution. The finite element model of welding repair is established according to the solid structure of the fixture. The heat transfer process is modelled by COMSOL and the heat source model is verified by experiments. According to the heat transfer simulation results, the heat transfer characteristics, cooling structure and fluid parameters of the fixture are analysed. The maximum temperature variation after adopting the cooling method is analysed and the welding experiment is carried out by establishing the parameterized surface of typical positions. The results show that the heat source model is in good agreement with experimental measurements. The heat exchange method can effectively improve the repairing welding quality.
Key words:  blade repair  heat transfer modeling  cooling method  MPAW  heat flow coupling