重燃叶片浇不足缺陷数值模拟及形成机理研究  

Numerical Simulation and Formation Mechanism of Misrun Defects in Industrial Gas Turbine Blade

作　　者：郭雄[1,2] 陶飞 杨啊涛[1,2] 史卫杰 曾洪 杨照宏 Guo Xiong;Tao Fei;Yang Atao;Shi Weijie;Zeng Hong;Yang Zhaohong(Dongfang Electric Corporation Dongfang Turbine Co.,Ltd.;State Key Laboratory of Long-life High Temperature Materials)

机构地区：[1]东方电气集团东方汽轮机有限公司 [2]长寿命高温材料国家重点实验室

出　　处：《特种铸造及有色合金》2019年第12期1330-1335,共6页Special Casting & Nonferrous Alloys

摘　　要：采用ProCAST软件研究了某重型燃机叶片充型过程中液态金属的速度场、温度场分布,阐述了浇不足缺陷的形成机理及各工艺参数的影响行为。研究表明,浇不足缺陷产生于节点开始充型至局部液态金属停止流动阶段,其本质在于该阶段液态金属热量损失过大;而根本原因是由于液态金属的充型顺序、充型轨迹及热交换影响了温度分布。此外,研究还发现,提高浇注温度可以改善浇不足缺陷;提高浇注速率可改变充型顺序及路径,但不一定会改善热交换状态及浇不足缺陷。通过浇注系统优化设计、合理控制浇注参数,可以从根本上控制液态金属的充型顺序、充型路径及热交换,从而有效地避免浇不足缺陷的产生。The velocity field and temperature field of liquid metal in the filling process of a heavy-duty gas turbine blade were simulated by the ProCAST software.The formation mechanism of misrun defect and the influence behavior of process parameters were described.The results reveal that the defect of misrun is caused by the excessive heat loss of liquid metal during the filling process,which is essentially attributed to the filling order,filling track and heat exchange affecting the temperature distribution of the liquid metal.In addition,the result also found that the scale of misrun defects can be improved with increasing in pouring temperature.The filling sequence and path can be changed with increasing filling rate,however not necessarily improve heat exchange status and misrun defects.The filling sequence,filling path and heat exchange of liquid metal can be fundamentally controlled by optimizing design of the gating system and reasonably controlling the casting parameters,thus effectively avoiding the defect of misrun.

关 键 词：燃机叶片 充型过程 数值模拟 浇不足 

分 类 号：TG249.5[机械工程—精密仪器及机械] TP311[金属学及工艺—铸造]