航空发动机双转子系统高/低压涡轮碰摩振动分析

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (1) : 243-253.

论文

聂日敏1，2，3，曹树谦1，2，3，郭虎伦1，2，3

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

NIE Rimin1,2,3, CAO Shuqian1,2,3, GUO Hulun1,2,3

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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。

Abstract

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.

导出引用

聂日敏1，2，3，曹树谦1，2，3，郭虎伦1，2，3. 航空发动机双转子系统高/低压涡轮碰摩振动分析[J]. 振动与冲击, 2021, 40(1): 243-253

NIE Rimin1,2,3, CAO Shuqian1,2,3, GUO Hulun1,2,3. Rub-impact vibration analysis of PH/LH turbines of aeroengine dual-rotor system[J]. Journal of Vibration and Shock, 2021, 40(1): 243-253

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