多运行状态条件下变刚度指尖密封设计理论研究

项目名称： 多运行状态条件下变刚度指尖密封设计理论研究

项目编号： No.51305343

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 张延超

作者单位： 西安理工大学

项目金额： 25万元

中文摘要： 本项目以航空发动机动态密封在起飞、巡航、格斗和降落状态下的稳定性设计技术需求为牵引，开展多运行状态条件下变刚度指尖密封的设计理论和方法研究。通过采用理论分析、数值仿真和试验研究结合的方式，揭示多运行状态变化条件下压差、温度和转速等不同于结构维度上的工况参数对动态密封装置稳定性的影响机理，通过研究指尖密封变形能与应变能之间的关系，确定指尖密封变形与刚度的关系特征，探索指尖密封变刚度设计的途径和刚度切换条件，基于贝塞尔曲线或样条曲线等形状可控的指尖梁型线结构，提取指尖密封的变刚度设计方法，结合多目标优化研究凝练多运行状态条件下变刚度气膜指尖密封的设计新理论及其泄漏性能、磨损特性和稳定性评价方法，根据典型工程应用环境和多运行状态条件开展试验验证研究。本项目对满足多运行状态条件下的新型动态密封装置研制以及提升航空发动机的性能，具有重要科学意义和工程价值，也为类似理论和技术问题的解决提供了研究参考。

中文关键词： 变刚度；指尖密封；优化设计；多运行状态；

英文摘要： This project forcuses on the stability design of dynamic seals for advanced aero-engines under the running status of taking off, cruising, combating and landing, to curry out some researches on the design theory and method for variable stiffness of finger seals under multi-running status condition. The influences of pressure difference, tempresure and rotating speed on the stability of dynamic seals under the multi-running status are revealed by therical analysis, numerical simulation and experimental research. Through investigations of the relationship between deformation and strain engry of finger seals, the relationship of the deformation and stiffness for finger seals will be obtained as well as the methods and switching conditions to design finger seals with variable stiffness will be studied. Based on the finger stems structure which can be controled by using Bezier curve and spline curve,the variable stiffness design mehtod for finger seal is built.Then combining the previous investigation and multi-objective optimization,the new design theory for variable stiffness finger seal under the multi-running status condition and evaluation methodology for leakage, abrasion and stability are proposed.Last the verification testings, based on special engineering application enviroments and multi-running status cond

英文关键词： variable stiffness；finger seal；optimization design；multiple running state；