抽蓄电站推力轴承润滑油性能失效会严重影响机组的安全运行,导致轴瓦表面被烧坏。基于VOF两相流模型和SST k-ω湍流模型对抽蓄电站推力轴承内部油气系统开展三维非定常数值计算,获得额定工况下的机组推力轴承系统润滑油三维热流动力润滑特性。结果表明:机组稳定运行时,油膜内部的润滑油表观速度和压力呈现明显的区域性分布,润滑油流速主要处于19.2~38.3 m/s。油膜内含有微量空气,润滑油体积分数分布明显,随着流量增大,瓦面最高温度增大但整体温度(平均温度)降低,轴瓦左右端面润滑油温度呈现明显阶梯分布。油膜剪切应力随流量增加呈现出“先快速增长,后增幅减缓”的趋势,逐渐趋于饱和,最大剪切应力由7.08 Mpa增加至7.76 Mpa。研究结果为进一步提升水轮机推力轴承润滑性能和油雾抑制研究提供理论基础。

The performance failure of lubricating oil in the thrust bearing of a pumped storage power station can severely impact the safe operation of the unit, potentially leading to the burning of the bearing surface. Based on the VOF two-phase flow model and the SST k-ω turbulence model, a three-dimensional unsteady numerical simulation of the oil-air system inside the thrust bearing of a pumped storage power station was conducted. The three-dimensional thermo-hydrodynamic lubrication characteristics of the thrust bearing system under rated operating conditions were obtained. The results indicate that during stable operation of the unit, the apparent velocity and pressure of the lubricating oil inside the oil film exhibit distinct regional distributions, with the oil flow velocity mainly ranging from 19.2 to 38.3 m/s. A small amount of air is present in the oil film, resulting in a significant distribution variation of the lubricating oil volume fraction. As the flow rate increases, the maximum temperature of the tile surface increases but the overall temperature (average temperature) decreases, respectively, and the oil temperature on the left and right end faces of the bearing pad showed a distinct stepped distribution. The shear stress in the oil film increased rapidly at first with increasing flow rate, followed by a gradual reduction in the growth rate, eventually approaching saturation. The maximum shear stress increased from 7.08 MPa to 7.76 MPa. The findings of this study provide a theoretical basis for further improving the lubrication performance of hydroturbine thrust bearings and for research on oil mist suppression.

河南五岳抽水蓄能电站机组振动性能及轴系多场耦合性能评估(XHWY-A-20232-DL-KY01)