350MW级蓄能机组可倾瓦导轴承流体动力润滑计算

Calculation of hydrodynamic lubrication of tilting pad guide bearing for 350 MW pumped-storage units

为了解决大型抽水蓄能机组可倾瓦导轴承性能计算的问题,笔者根据流体润滑理论,建立了大型可倾瓦导轴承的流体动力润滑数学模型,设计了计算程序,并以此程序对某350 MW级抽水蓄能机组的导轴承润滑性能进行了计算分析和研究。其结果表明,大型可倾瓦导轴承的流体动力润滑计算程序运行稳定可靠,导轴承的动力润滑性能会受到轴承负荷、机组转速、油槽进油温度等因素的影响,最高油膜温度、最小油膜厚度是制约轴承运行工况参数变化范围的关键因素。

In order to solve the calculation problem of the tilting pad guide bearing for large pumped-storage units,according to hydro lubricating theory,the author established the hydrodynamic lubricating mathematical model of the tilting pad guide bearing and analyzed and studies the hydrodynamic lubrication of a 350 MW pumped-storage unit by the designed calculation program. The result shows that the calculation program operates stably and reliably. Besides,the lubricating character of guide bearing is affected by factors including bearing load,unit speed and inlet oil temperature of oil tank. The maximum oil film temperature and the minimum oil film thickness become the critical factor restricting the variation range of operating parameters.