微裂纹组合转子的尺寸效应研究  

RESEARCH ON SIZE EFFECT OF COMBINED ROTOR CONSIDERING MICROCRACK

作　　者：朱卓平 王艾伦[1,2] 邵世聪 刘向军 ZHU ZhuoPing;WANG AiLun;SHAO ShiCong;LIU XiangJun(State Key Laboratory of High Performance and Complex Manufacturing,Central South University,Changsha 410083,China;College of Mechanical and Electrical Engineerings Central South University,Changsha 410083,China;Institute of Light Alloy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083 [2]中南大学机电工程学院,长沙410083 [3]中南大学轻合金研究院,长沙410083

出　　处：《机械强度》2019年第6期1454-1459,共6页Journal of Mechanical Strength

基　　金：国家重点基础研究发展计划(973计划)(2013CB035706);中南大学中央高校基本科研业务费专项资金(2017zzts640)资助~~

摘　　要：组合转子模化放大或缩小过程中,由于尺寸效应的存在,微裂纹扩展对不同尺寸组合转子动力学性能影响规律尚不明确。应用相似理论的量纲分析法简要介绍微裂纹扩展过程中存在的“尺寸效应”,并以某重型燃气轮机组合转子原型及其2. 3倍缩尺模型和1. 3倍放大模型为研究对象,分析了初始微裂纹随组合转子尺寸同比例变化和不随组合转子尺寸变化两种情况下,组合转子固有频率漂移情况。结果表明:用简单的Paris公式分析因微裂纹扩展导致不同尺寸组合转子固有频率漂移时存在较大误差,其动力学性能变化和组合转子尺寸之间存在一定的相关性。During the process of combined rotor modularization amplification or reduction,due to the size effect,the law of the influence of microcrack expansion on the dynamic performance of the combined rotor with different sizes is not clear.Dimensional analysis method of similarity theory was used to introduce the"size effect"existing in the process of microcrack expansion.And taking the prototype,2.3-fold scale model and 1.3-fold scale-up model of a heavy duty gas turbine combined rotor as the research objects,the combined rotor natural frequency drift were analyzed in the case of initial microcracks varying with combined rotor size.The results show that there is comparatively large deviation when using the ordinary Paris formula to analyze the natural frequency drift of the different size combined rotors caused by microcrack expansion.There is a certain correlation between the change of dynamic performance and the size of combined rotor considering microcracks.

关 键 词：组合转子 相似理论 微裂纹 动力学性能 系列化设计 尺寸效应 

分 类 号：TH114[机械工程—机械设计及理论]