基于TFSI的冲击载荷作用下可倾瓦径向轴承热瞬态性能分析

Thermal Transient Process Analysis of Tilting Pad Bearing under Impact Load Based on TFSI

为了研究可倾瓦径向轴承在载荷扰动下的瞬态行为,对瞬态油膜压力和温度分布采用TFSI(Temperature-Fluid-Structure Iteration)瞬态计算方法,建立三维油膜和轴颈及瓦块三维有限元模型。应用热流固耦合迭代求解方法,模拟汽轮发电机可倾瓦径向轴承在阶跃载荷冲击工况下热瞬态非线性响应过程。给出瞬态过程中油膜温度分布,最高温度、最小膜厚等参数的变化规律。认为瞬态过程中,油膜温度和膜厚变化量较大,油膜温度和膜厚响应有一定的超调量,瞬态过程中有可能因油膜温升过高或膜厚太小而导致失效。

In order to study the tilting pad radial bearing transient state behavior under disturbance load, TFSI transient state computational method was used to compute the pressure and the temperature distribution of oil film, three-dimensional finite element model include oil film and title bearing pad and shaft collar were built. Using the heat flow solid coupling iteration solution method, the nonlinear hot transient response process of turbo-generator tilting radial bearing under impact load is simulated. Changing law of the oil film temperature distribution, the maximum temperature, the smallest oil film thickness and so on are obtained. It is considered that in the transient state process, the significant changes of oil film temperature as well as film thickness are resulted from overshoot in the responses of maximum temperature and minimum film thickness, leading possibly to the damage of bearing during transient period.