服役工况载荷谱下发动机涡轮叶片的热机械疲劳寿命预测
杨文军 , 李思成 , 金星卓 , 李集辰 , 高继然
沈阳航空航天大学学报 ›› 2025, Vol. 42 ›› Issue (05) : 20 -29.
服役工况载荷谱下发动机涡轮叶片的热机械疲劳寿命预测
Thermo-mechanical fatigue life prediction of engine turbine blade under service operating condition load spectrum
为解决复杂多场耦合服役工况下涡轮叶片的热机械疲劳损伤问题,基于发动机服役工况载荷谱,结合改进的Morrow低周疲劳损伤和蠕变损伤模型,进行发动机涡轮叶片的热机械疲劳寿命预测。首先,考虑叶栅间的转静干涉效应,完成了涡轮叶片的三维流场建模与多场耦合仿真。然后,基于服役工况载荷谱下和多场耦合响应特性,确定了涡轮叶片疲劳损伤关键考核位置。其次,利用改进的Morrow低周疲劳损伤模型,并与传统模型和试验结果进行了比较检验。最后,根据线性累积损伤准则及Morrow低周疲劳损伤和L-M蠕变损伤,预测了服役工况下涡轮叶片的热机械疲劳寿命。结果表明,数值仿真计算结果与试验数据吻合良好,验证了涡轮叶片三维非定常流场模拟和改进Morrow低周疲劳损伤模型的准确性。在服役工况发动机载荷谱和多场耦合作用下,考虑Morrow低周疲劳损伤和L-M蠕变损伤,涡轮叶片的热机械疲劳寿命为6.028×103h,最小寿命区域位于进气口叶根前缘考核位置A,此处为涡轮叶片的重点检修部位,可为复杂服役工况涡轮叶片的热机械疲劳寿命预测提供理论参考和依据。
In order to solve the thermo-mechanical fatgue damage problem of trubine blade under the complex multifield coupling service conditions,combining the improved Morrow low-cycle fatigue damage and creep damage models based on the load spectrum of the engine’s service conditions,the prediction of the thermo-mechanical fatgue life of engine turbine blade was achived.Firstly, considering the rotor-stator interference effect between cascades, the three-dimensional flow field modeling and multi-field coupling simulation of the turbine blade were completed. Further, based on the engine load spectrum and multi-field coupling response characteristics under service operating condition, the key assessment positions of fatigue damage of the turbine blade were determined. then, an improved Morrow low-cycle fatigue damage model was developed and compared with traditional models and experimental results for verification. Finally, using the linear cumulative damage criterion, as well as the Morrow low-cycle fatigue damage and L-M creep damage, thermo-mechanical fatigue life of the turbine blade was predicted under service conditions. The results show that the numerical simulation results are in good agreement with the experimental data, verifying the accuracy of the three-dimensional unsteady flow field simulation of the turbine blade and the improved Morrow low-cycle fatigue damage model. Under the engine load spectrum and multi-field coupling effect of service conditions, considering the Morrow low-cycle fatigue damage and L-M creep damage, the thermo-mechanical fatigue life of the turbine blade is 6.028×10³ h. The area with the minimum life is located at the leading edge of the blade root at the air inlet, the assessment position A, which is the key maintenance part of the turbine blade. This study can provide a theoretical reference and basis for the thermo-mechanical fatigue life assessment of turbine blade under complex service operating condition.
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国家自然科学基金(52205116)
辽宁省自然科学博士启动基金(2024-BS-157)
辽宁省教育厅面上项目(JYTMS20230258)
教育部重点实验室开放基金(LJ232410143008)
国防航空制造工艺数字化国防重点学科实验室开放基金(SHSYS202406)
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