轴承支承总刚度对液体火箭发动机涡轮泵转子系统稳定性影响研究

Effects of Bearing Supporting Stiffness on Dynamic Stability of Turbopump Rotor System in Liquid Rocket Engine

关键词:  液体火箭发动机  涡轮泵  转子系统  支承总刚度  稳定性

Key words:  Liquid rocket engine  Turbo-pump  Rotor system  Supporting stiffness  Stability

摘要:

针对低温液体火箭发动机涡轮泵转子非线性系统开展了轴承支承总刚度对稳定性的影响研究。建立了涡轮泵转子非线性系统的动力学模型,分别研究了没有安装偏心和存在安装偏心条件下泵端和涡轮端轴承支承总刚度变化对转子系统稳定性的影响,给出了失稳转速随支承刚度的变化规律。研究表明:泵端轴承支承总刚度对稳定性影响较大,涡轮端轴承支承总刚度对轴系的稳定性影响较小。

Abstract:

The dynamic stability research about bearing supporting stiffness was carried out for the turbine pump nonlinear rotor system of low temperature liquid rocket engine. The nonlinear rotor system dynamic model was established. The effects of supporting stiffness change of the bearing near the pump and the bearing near the turbine were researched on the stability of the rotor system under condition of installation eccentricity and no-installation eccentricity. The effects of bearing supporting stiffness were analyzed on instability speed. This study provides method for optimum design and fault diagnosis and safe operation of the turbine pump rotor in liquid rocket engine.