关键词: 航空发动机, 涡轮盘, 定寿方法, 失效率评估, 可靠性

Abstract: Aiming at the urgent demand for the development of life management for aero-engine in China,this study reviewed five kinds of lifetime assessment methods for aero-engine turbine disk,including the predicted safe cyclic life life鄄 time assessment method,the 2/3 dysfunction lifetime assessment method,the databank lifetime assessment method, the damage tolerance lifetime assessment method and the retirement for cause lifetime assessment method.Firstly, the development trends and prospects of lifetime assessment methods for turbine disk were systematically analyzed from three perspectives of non-destructive testing and online monitoring techniques,load and failure mode analysis techniques and advanced fatigue life prediction methods.Secondly,combined with practical engineering cases,the reliability assessment procedures,parameter determination and applicable conditions of the selected lifetime as鄄 sessment method were introduced.And the impact of the number of test samples and different life distribution as鄄 sumptions on the lifetime assessment results were explored.Finally,the existing research work and future develop鄄 ment trends of turbine disk lifetime assessment methods were summarized.It was pointed out that the lifetime as鄄 sessment of aero-engine turbine disk in China should aim at fully tap into the life potential of components,and based on practical engineering needs,combining with related advanced technologies such as new sensor,digital twins and machine learning,in order to further improve the reliability and economy of the entire life cycle of aero engine.

Key words: aero-engine, turbine disk, lifetime assessment method, failure rate assessment, reliability