篦齿封严气弹稳定性影响因素研究  

Study on the Factors Influencing the Aeroelastic Stability of Labyrinth Seal

作　　者：苏国征 孙丹 王志[1,2] 李玉 王文[3] 徐梅鹏 SU Guozheng;SUN Dan;WANG Zhi;LI Yu;WANG Wen;XU Meipeng(Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System,School of Aero-engine,Shenyang Aerospace University,Shenyang Liaoning 110136,China;Key Laboratory of Turbomachinery Advanced Seal Technology,Shenyang,Shenyang Aerospace University,Shenyang Liaoning 110136,China;AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China)

机构地区：[1]沈阳航空航天大学航空发动机学院,辽宁省航空推进系统先进测试技术重点实验室,辽宁沈阳110136 [2]沈阳航空航天大学沈阳市透平机械先进密封技术重点实验室,辽宁沈阳110136 [3]中国航发商用航空发动机有限责任公司,上海200241

出　　处：《润滑与密封》2023年第9期63-72,共10页Lubrication Engineering

基　　金：国家自然科学基金项目(52075346);受先进航空动力创新工作站(依托中国航空发动机研究院设立)资助(HKC2020-02-030)。

摘　　要：为探究篦齿封严气弹失稳机制,理论分析了篦齿封严结构动力学与气弹稳定性判定公式,建立了篦齿封严结构动力特性数值求解模型与气弹稳定性求解模型,并验证该了方法的准确性;研究了篦齿环齿间距、壁厚以及转速对篦齿封严固有频率与气弹稳定性的影响规律,揭示了篦齿封严气弹失稳影响机制。研究表明:齿间距、壁厚对固有频率的影响程度随着节径数的增加而增大,对前三阶固有频率影响不大;转速对于第一阶固有频率影响最大;篦齿封严齿间距的增加会导致固有频率和气弹稳定性的下降;篦齿封严壁厚的增加可引起固有频率的升高,并且可以有效改善气弹稳定性;升高转速会引起篦齿环固有频率较明显的增加,对气弹稳定性影响较小。To explore the mechanism of aeroelastic instability of labyrinth sealing,the structure dynamics and aeroelastic stability criteria of labyrinth seal were analyzed theoretically.A numerical model for solving the aeroelastic stability of labyrinth seals was established,and the accuracy of the numerical method was verified.The influences of labyrinth seal ring cavity width,wall thickness and rotating speed on the natural frequency and aeroelastic stability of labyrinth seal were studied.The influence mechanism of aeroelastic instability of labyrinth seal was revealed.The results show that the influences of cavity width and wall thickness on natural frequency increase with the increase of nodal diameter number,and have little effect on the first three natural frequencies.The increase of the labyrinth seal ring cavity width lead to the decrease of the natural frequency and the aeroelastic stability.The increase of labyrinth seal wall thickness lead to the increase of natural frequency and effectively improve the aeroelastic instability.Increasing rotational speed cause significant increase in the labyrinth seal natural frequency and has little influence on the aeroelastic stability.

关 键 词：篦齿封严 动力学特性 气弹稳定性 判定公式 振动 

分 类 号：V215.3[航空宇航科学与技术—航空宇航推进理论与工程]