微型燃气轮机浮环轴承-密封系统的动力学分析
首发时间:2011-06-10
摘要:本文对浮环轴承支承某微型燃气轮机转子系统的动力学特性进行分析,建立了浮环轴承双层油膜流体润滑力学控制方程和浮环运动机理控制方程。利用有限元素法对浮环轴承的内,外层静态油膜力进行了计算并得到双层油膜压力。在小摄动范围内,联立悬臂转子系统的动力学方程、浮动环运动方程求出浮环轴承的等效刚度和阻尼系数,建立了微型燃气轮机整个轴系的转子动力学模型。对整机轴系的临界转速、各阶模态振型、谐响应、不平衡响应等的一系列转子动力学行为进行预测,得出了线性失稳转速及涡动比等设计参数,有效指导了微型燃气轮机的转子动力学设计。对浮动套惯性离心力的仿真,得出了浮动套的惯性形变对浮环轴承间隙及性能的影响。同时分析了转子系统在10000rpm至30000rpm时密封压力分布情况。通过与原型机的实验结果对比,解释了浮环轴承普变存在的低频振动及油膜涡动、油膜震荡等非线性现象,采用此方法分析浮环轴承-悬臂转子动力学问题具有实际意义。
关键词: 微型燃气轮机 浮环轴承 有限元分析 迷宫密封 CFD
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Rotordynamics analysis of micro gas turbogenerator supported on floating ring bearing and labyrinth seal system
Abstract:In this paper, the rotordynamic of a micro gas turbogenerator(MGT) supported on floating ring bearings (FRBs) is anlysized. The governing equations of hydrodynamic lubrication of inner and outer films in floating ring bearing are built.Also, the kinematic equaton of floating bush is derivated. the disturbution of two films of pressure is caculated using FE method. In the perturbation scale, the equivalent coefficients are abtained combining the the governing equations of floating bush and the whole rotor- bearing system of the protype MGT model. The parameters of critical speed, the shape and modal of vibration,harmonic and unbalance responces are predicted. the designing values of unstable speed range and whirl ratios are presented. These parameters are useful for rotordynamic design of MGT. At meanwhile, the simulation of centrifugal forces of floating bush is done, The influences of FRB clearances and dynamic performace caused by inertial deformation are also described. Pressure distribution and labyrinth seal dynamics parameters of micro-turbine system are analyzed from the 10krpm to 30krpm. Compared to the protype model test results, the common found nonlinear phenomena of subchronical vibration, oil whirl and oil whip are inteprted, the validity of this method is verified.
Keywords: Micro Gas turogenerator Floating ring bearing FEA Labyrinth Seal CFD
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