某型燃机支承环故障诊断分析及改进措施  

Fault Diagnosis Analysis and Improvement Measures of Supporting Ring of a Gas Turbine

作　　者：孙景国 奚银华 季晨 周渝航 SUN Jing-guo;XI Yin-hua;JI Chen;ZHOU Yu-hang(No.703 Research Institute of CSSC,Harbin,China,Post Code:150078;National Engineering Laboratory for Marine and Ocean Engineering Power System-Laboratory for Ocean Engineering Gas Turbine,Harbin,China,Post Code:150078;Unit 91991,Zhoushan,China,Post Code:316000)

机构地区：[1]中国船舶集团有限公司第七〇三研究所,黑龙江哈尔滨150078 [2]船舶与海洋工程动力系统国家工程实验室-海洋工程燃气轮机实验室,黑龙江哈尔滨150078 [3]91991部队,浙江舟山316000

出　　处：《热能动力工程》2021年第9期214-220,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家科技重大专项(2017-V-0003)。

摘　　要：针对某型燃气轮机支承环在试验过程中发生断裂、掉块故障,分别进行了强度计算、振动模态分析、低循环疲劳寿命分析以及断口分析。综合分析结果表明:支承环故障属于高低周复合疲劳;焊缝和螺纹处应力集中导致应力过大而开裂;采取把周向焊缝取消,将月牙板和罩壳一体设计及降低应力集中等措施,排除故障。The strength calculation,vibration mode analysis,low cycle fatigue analysis and fracture analysis were carried out respectively in view of the failure of block loss of certain gas turbine supporting ring during the test.The comprehensive analysis results show that the turbine supporting ring fracture failure is caused by high and low cycle composite fatigue.Stress concentration in welds and threads leads to excessive stress cracking.The fault can be eliminated by canceling the circumferential weld,integrating the design of the cover enclosure and crescent-shaped plate and reducing the stress concentration.

关 键 词：低循环疲劳 断口分析 断裂 故障诊断 改进措施 

分 类 号：TH133.1[机械工程—机械制造及自动化]