某型涡轮增压器轴流涡轮疲劳寿命预测分析
2021-09-10刘演龙钟佳宏何晓燕
刘演龙 钟佳宏 何晓燕








摘要: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。
Abstract: 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.
關键词:轴流涡轮;疲劳寿命;线性Miner累计损伤法则;拉森-米勒参数法
Key words: axials turbine;fastigue life;linear Miner cumulative damage law;the larsen-miller parameter method
中图分类号:U464.135 文献标识码:A 文章编号:1674-957X(2021)07-0046-04
0 引言
涡轮增压器作为船用柴油机的重要组成部件,其可靠性在很大程度上影响着整个柴油机的可靠性。同时,由于增压器常在高速、高温、工况多变的苛刻条件下工作,可靠性受到严重的挑战。因此,对涡轮增压器可靠性进行深入研究,不仅对提高增压器本身的可靠性具有重要的意义,而且有助于提高增压器发动机的可靠性,降低增压器与发动机的维修成本。
涡轮盘与涡轮叶片作为涡轮增压器的核心部件,其性能好坏直接关系到增压器的性能。随着近年来科学技术的发展,涡轮的设计取得很大进步,但涡轮的疲劳破坏事故时有发生,涡轮的疲劳破坏问题成为影响增压器的可靠因数之一。……
