某发动机高压压气机篦齿盘均压孔孔边裂纹故障分析

为确定某发动机高压压气机篦齿盘均压孔孔边裂纹故障原因,应用大型结构分析程序Ansys研究了装配紧度与篦齿盘振动特性的关系,选择合适的有限元分析模型.对不同装配紧度条件下的篦齿盘进行了振动频率、相对振动应力计算和行波共振分析,并与试验结果进行了对比.通过空气系统流路与结构特点分析,确定了影响篦齿盘振动的激振因素为低压涡轮轴孔、中介机匣支板和喷嘴.根据篦齿盘动力特性结合静强度计算结果分析认为故障产生的原因是由于均压孔孔边静应力水平较高,在振动应力叠加作用下产生高周疲劳破坏.并对后续使用提出了建议.

Study of Vent Hole Crack Failure for an Aeroengine Labyrinth Seal Disk

In order to study the vent hole crack failure of an engine high pressure compressor labyrinth seal disk, the relationship between the assembly accuracy and labyrinth seal disk vibration was investigated to choose the applicable finite element analytical model by the Ansys. The vibration frequency analysis, relative vibration stress calculation and traveling wave analysis were performed in the different assembly accuracy condition, and then the experimental results were contrasted. The stress factors affected labyrinth seal disk vibration are the low pressure turbine bearing holes, case plates and nozzles by analyzing air system flow and structure characteristics. The analysis shows that high cycle failure caused by vibration stress because of high vent hole stress, and the future application advice is proposed