摘要
该文对公司自主设计的微型燃气轮机涡轮进行了强度分析与结构优化,考察了其裂纹扩展寿命。首先,采用有限元软件ABAQUS计算了优化前涡轮的应力分布,最大Mises应力约为947 MPa,超过了静强度许用应力821 MPa。进一步针对该涡轮开展了结构优化,进行了开孔以及挖槽处理,优化后的结构最大Mises应力约为806 MPa,满足静强度要求,同时最大应力点位置也发生变化。采用扩展有限元方法模拟了裂纹扩展路径,结果显示裂纹面几乎垂直于周向应力方向。将裂纹面简化为样条曲线,采用坍塌单元计算了不同长度裂纹的应力强度因子,在此基础上预测了裂纹扩展寿命。
In this paper,the strength analysis and structural optimization of the micro gas turbine independently designed by the company are carried out,and its crack propagation life is investigated.Firstly,the stress distribution of the turbine before optimization is calculated by using the finite element software ABAQUS.The maximum Mises stress is about 947 MPa,which exceeds the allowable static strength stress of 821 MPa.Further,the structure optimization of the turbine was carried out,and the drilling and grooving treatment were carried out.The maximum mises stress of the optimized structure was about 806 MPa,which met the static strength requirements,and the position of the maximum stress point also changed.The crack propagation path is simulated by the propagation finite element method.The results show that the crack surface is almost perpendicular to the circumferential stress direction.The crack surface is simplified as a spline curve,and the stress intensity factors of cracks with different lengths are calculated by collapse element.On this basis,the crack propagation life is predicted.
作者
靳普
胡晨
童江龙
李德旺
刘慕华
JIN Pu;HU Chen;TONG Jianglong;LI Dewang;LIU Muhua(Yongxu Tengfeng New Energy Power Technology(Beijing)Co.,Ltd.,Beijing,100176 China)
出处
《科技资讯》
2021年第19期63-69,共7页
Science & Technology Information
关键词
微型燃气轮机
结构优化
裂纹
裂纹扩展
扩展有限元
Micro gas-turbine engine
Structural optimization
Crack
Crack growth
Extended finite element method
