高速篦齿碰摩对封严环裂纹萌生与扩展影响研究  

Research on the influence of high speed labyrinth rubbing on the initiation and propagation of crack in sealing ring

作　　者：畅佳琪 李辉东 解文博 慕琴琴[1] 陈永辉[1] 杨卫华[3] CHANG Jiaqi;LI Huidong;XIE Wenbo;MU Qinqin;CHEN Yonghui;YANG Weihua(National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,China;AECC South Industry Co.,Ltd.,Zhuzhou 412002,China;College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中国飞机强度研究所强度与结构完整性全国重点实验室,西安710065 [2]中国航发南方工业有限公司,株洲412002 [3]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空工程进展》2024年第5期127-134,共8页Advances in Aeronautical Science and Engineering

基　　金：国家科技重大专项(2017-Ⅶ-0011)。

摘　　要：篦齿封严结构碰摩是航空发动机空气系统工作中存在的普遍问题,由于实际碰摩中难以观察到封严环上裂纹萌生与扩展的过程,采用有限元方法进行数值仿真能够对裂纹萌生与扩展过程和机理有更加深入的认识。建立碰摩后带磨损槽的封严环模型,考虑了封严环表面对流换热、碰摩力和碰摩温度,采用扩展有限元法(XFEM)对封严环碰摩温度场、应力场以及裂纹的萌生与扩展进行数值研究,并将仿真分析结果与碰摩试验裂纹结果进行对比。结果表明:数值仿真所得到的裂纹萌生位置及扩展方向均与碰摩试验中实际产生的裂纹基本一致,揭示了裂纹产生的机理,证明了该模型能够较好地模拟碰摩所导致的裂纹萌生与扩展过程。The rubbing of the labyrinth sealing structure is a common problem during the operation of aeroengine air system.Due to the difficulty in observing the process of crack initiation and propagation on the sealing ring during actual rubbing,using finite element method for numerical simulation can provide a deeper understanding of the pro-cess and mechanism of crack initiation and propagation.The sealing ring model with wear grooves after rubbing is proposed.The surface convective heat transfer coefficient,rubbing force and rubbing temperature of the sealing ring are considered.The extended finite element method(XFEM)is used to numerically study the temperature field,stress field,and crack initiation and propagation of the sealing ring.The crack numerical simulation result is com-pared with the result of rubbing experiment.The results show that the crack initiation and propagation direction ob-tained from numerical simulation are basically consistent with those obtained from rubbing experiment.The mecha-nism of crack initiation is revealed,and it is proven that this method can effectively simulate the process of crack ini-tiation and propagation caused by rubbing.

关 键 词：篦齿封严 碰摩 扩展有限元 裂纹萌生 裂纹扩展 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]