航空发动机双转子系统高/低压涡轮碰摩振动分析  

Rub-impact vibration analysis of PH/LH turbines of aeroengine dual-rotor system

作　　者：聂日敏 曹树谦[1,2,3] 郭虎伦 NIE Rimin;CAO Shuqian;GUO Hulun(School of Mechanical Engineering,Tianjin University,Tianjin 300354,China;Tianjin Municipal Key Lab of Nonlinear Dynamics and Control,Tianjin 300354,China;National Demonstration Center for Experimental Mechanics Education,Tianjin 300354,China)

机构地区：[1]天津大学机械工程学院,天津300354 [2]天津市非线性动力学与控制重点实验室,天津300354 [3]力学国家级实验教学示范中心,天津300354

出　　处：《振动与冲击》2021年第1期243-253,263,共12页Journal of Vibration and Shock

基　　金：国家重点基础研究发展计划资助(2015CB057400);国家自然科学基金资助项目(11672201);重大专项基础研究项目(2017-Ⅳ-0008-0045)。

摘　　要：针对航空发动机碰摩问题,考虑高压涡轮与低压涡轮碰摩,建立了五点支承的航空发动机双转子系统动力学模型。碰摩力模型采用Lankarani-Nikravesh滞回力模型。利用龙格-库塔法进行数值计算,并研究了双转子系统的频谱特性、幅频特性。最后,基于双转子实验台,部分验证了数值计算结果。结果表明:(1)双转子系统碰摩会使系统产生激励频率以及组合频率,并发生组合共振;(2)高压涡轮碰摩会导致系统产生反向涡动全周碰摩,低压涡轮碰摩对高压涡轮碰摩有抑制作用,即高低压涡轮同时碰摩时与高压涡轮碰摩时相比,系统发生反向涡动的转速区间更窄、振动幅值更低;(3)在升降速过程中,碰摩会导致双转子系统出现单个甚至多个双稳态现象。Considering rub-impact of high pressure(HP)and low pressure(LP)turbines of an aeroengine,a five-point supported aeroengine dual-rotor system’s dynamic model was established.Lankarani-Nikravesh hysteretic force model was taken as the rub-impact force model.Then Runge-Kutta method was used to do numerical calculation,and study spectral characteristics and amplitude-frequency ones of the dual-rotor system.Finally,based on a dual-rotor test platform,the numerical results were partly verified with tests.Results showedthat(1)rub-impact of the dual-rotor system can generate excitation frequencies and combined frequencies,and combined resonance appears;(2)rub-impact of HP turbine can cause reverse whirl and full annular rub,and rub-impact of LP turbine can suppress rub-impact of HP turbine,sowhen HP and LP turbines rub simultaneously,compared with rub-impact of HP turbine only,the rotating speed range for the system reverse whirl is narrower and vibration amplitude is lower;(3)in process of speed up and down,rub-impact can cause single or even multiple bi-stable phenomena in the dual-rotor system.

关 键 词：高/低压涡轮碰摩 双转子系统 组合共振 反向涡动 双稳态现象 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]