涡轮泵端面密封贮存仿真及可靠性分析

Storage Simulation and Reliability Analysis of Turbo Pump End-face Seal

为分析长期贮存条件下涡轮泵端面密封变形问题,采用有限元分析软件对涡轮泵端面密封静环组件过盈配合及长期贮存中的蠕变变形进行了分析计算。使用应变率硬化材料模型描述蠕变特性,得到了不同年限下密封组件应力-应变和石墨环变形结果。随后利用无失效数据的多层Bayes方法和广义强度应力模型两种方法对端面密封静环组件可靠性进行了评估。广义强度应力模型将仿真结果引入,联合现场试验信息评估组件长期贮存后密封性能可靠性,有效提高了小子样条件下可靠性评定的精度,而且更加可信。

To study the long - term storage distortion of turbo pump end - face seal, the interference fit and long term storage creep character of the stationary seal ring of end - face seal is analyzed using finite element software. The creep behavior is formulated using strain ratio harden material model. The stress - strain of the module and the deflection of the graphite annulus are present in different storage life. And turbo pump end - face seal＇s reliability is obtained using hierarchical Bayesian zero - failure estimation and stress - strength interference method. In the latter method, simulation result is employed. The long - lime storage reliability estimation using field test information and simulation information can effectively increase the accuracy of estimator under small sample situation, and is more credible.