考虑叶冠工作面接触特性分散性影响的涡轮叶片可靠性评估方法  

Reliability evaluation of turbine blades considering contact variability on working surface of shrouds

作　　者：马艳红[1] 李振华 张伟锋 熊伟 洪杰[1] MA Yanhong;LI Zhenhua;ZHANG Weifeng;XIONG Wei;HONG Jie(Research Institute of Aero-Engine,Beihang University,Beijing 100191,China;Hunan Aviation Powerplant Research Institute,Aero Engine Corporation of China,Zhuzhou Hunan 412002,China)

机构地区：[1]北京航空航天大学航空发动机研究院,北京100191 [2]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《航空动力学报》2025年第2期233-241,共9页Journal of Aerospace Power

基　　金：国家科技重大专项(Y2019-Ⅷ-0011-0172,J2019-Ⅷ-0008-0169)。

摘　　要：针对涡轴/涡桨发动机动力涡轮叶片带冠结构的振动问题,建立了考虑叶冠工作面接触特性分散性对连接界面接触刚度影响的叶片振动分析模型。模型考虑了加工公差、工作载荷环境变化和界面磨损损伤对叶冠工作面接触状态和叶片共振转速线分布特性的综合影响,同时评估了该结构系统发生疲劳断裂失效的概率。结果表明:由于加工公差和界面磨损损伤的共同影响,叶冠工作面接触刚度显著下降,进而降低了叶片周向一弯振型的振动频率。这使得该阶振型的叶片共振转速偏离设计值并与工作转速区相交,造成叶片有一定概率发生共振、进而发生高周疲劳失效,从而降低结构系统可靠性。In view of the shrouded structure system of power turbine blades of the turboshaft/turboprop engine and its reliability to processing errors,changes in working load environment and wear and damage to the contact surfaces between shrouds were analyzed.A blade vibration analysis model considering variability of contact surface of the shroud working surface on the contact stiffness of the interface was established,and the probability of fatigue fracture failure of the structural system was evaluated.Simulation results indicated that joint effect of processing errors and interface wear and damage can cause a decrease in the vibration frequency of the blade.This causes the resonant rotational speed of the blade in this vibration mode to deviate from the design value and intersect with the operating speed range,resulting in the risk of resonance and high-cycle fatigue failure,thus reducing the reliability of the structural system.

关 键 词：涡轮叶片 结构系统 损伤失效 动力特性 可靠性 

分 类 号：V231.96[航空宇航科学与技术—航空宇航推进理论与工程]