发动机空气管路断裂故障分析与改进验证  

Fracture Analysis and Improvement Verification of Air Pipe in Engine

作　　者：江泉 JIANG Quan(AECC Hunan Aviation Powerplant Research Institute,Hunan Zhuzhou 412002,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《失效分析与预防》2021年第2期143-147,共5页Failure Analysis and Prevention

摘　　要：航空发动机外部管路的可靠工作直接决定着发动机的使用安全。发动机空气管进行150 h持久摸底试验期间,管路出现断裂故障。采用宏观检查、冶金分析等方法对故障原因进行查找分析,基于管路焊接处应力大的分析结果进行管路应力计算及贴片测量,获得管路在实际工作中的应力大小。结果表明:管路在稳态工作范围内存在多阶固有频率,存在共振应力大的问题。后期对空气管的安装边结构进行局部优化、改进管路形状措施后,在整机上顺利通过60 h考核、150 h持久摸底,累计完成600余h的整机试验,未出现裂纹及断裂情况,验证改进措施的有效性。The reliable operation of the outer pipelines of aero engines directly determines the safety of the engines.During the 150 lasting mapping test,an engine air pipe fractured.Macroscopic inspection and metallurgical analysis were carried out to find and analyze the fault causes.Based on the analysis results of higher stress at the welded joint of the pipe,stress calculation and measurement were carried out to obtain the stress of the pipe during actual work.The results show that the pipe has multiple natural frequencies and the problem of large resonant stress in the steady working range.After the partial optimization of the mounting base structure of the air pipe and the improvement of the pipe shape,the whole machine passed the 60 h examination and 150 h lasting test successfully,and the whole machine test of more than 600 h was completed in total,without any crack or fracture,which verified the effectiveness of the improvement measures.

关 键 词：发动机 空气管 断裂 应力 共振 优化 

分 类 号：V233[航空宇航科学与技术—航空宇航推进理论与工程]