某型涡轮增压器轴流涡轮疲劳寿命预测分析

针对船用涡轮增压器在发动机实际工况下的疲劳失效模式,基于发动机的耐久试验任务剖面,分析了增压器在不同工况下运行时的涡轮转速的变化规律,计算了船用涡轮增压器涡轮疲劳危险部位的应力变化情况,其最大应力出现部位位于叶片根部,最大应力值为647MPa。利用线性Miner累计损伤法则,统计出涡轮增压器涡轮在发动机整个耐久试验任务剖面过程中的总损伤量为0.004,根据总损伤量和耐久试验总时长,推算出涡轮增压器涡轮的寿命为33334h;通过拉森-米勒参数法分析计算在工作状态下,涡轮的蠕变寿命为316227h,为后续涡轮可靠性分析提供理论参考。

Fatigue Life Prediction of Axial Flow Turbine of the Turbocharger

According to the fatigue of marine turbocharger in actual working condition of the engine under the failure mode,durability test mission profile engine based on analysis of the rotational speed of the turbocharger under different working conditions of the marine turbochargers turbine fatigue dangerous parts of the stress calculation,the maximum stress position located at the blade root,the maximum stress value is 647MPa.By using the linear Miner cumulative damage law,the total damage of turbocharger turbine during the whole endurance test task is calculated to be 0.004.Combined with the existing material mechanics performance,the leaves of dispersion coefficient is 6,calculate the corresponding number of cycles 400 times,according to the total amount of damage and durability test of the total length,calculate the turbocharger turbine for the life of 33334h,and the creep life of the turbine is 316227h under working conditions by the Larsen-Miller parameter method,which provides a theoretical reference for subsequent turbine reliability analysis.