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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Limit of Hydrodynamic Lubrication
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Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Limit of Hydrodynamic Lubrication

机译：水力发电机中使用弹簧支撑的推力轴承：水动力润滑的极限

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摘要

The fluid film breakdown in large spring-supported thrust bearings was examined experimentally for low rotor speeds. Under these conditions, the lubrication was hydrodynamic rather than thermohydrodynamic and thus, the limit of hydrodynamic lubrication was sought. A thrust bearing test facility was used to test three bearings with various loads, speeds, and lubricant viscosities. Power loss and oil temperatures were measured and, using elementary theory, these measured quantities were linked to friction and average fluid film thickness in the bearing. A dimensionless performance number was developed and correlated with the coefficient of friction based on the power loss measurements. The breakdown of fluid film lubrication at the limit of hydrodynamic lubrication was established for an average performance number. The accuracy of the experimental findings was explored by comparing the friction and film thickness calculated from the measurements with the predictions of a comprehensive software package. Some general agreement was obtained. The relationship between the lambda ratio and a modified performance number was also examined based on typical surface roughness measurements. Although the procedures developed did not provide a high level of precision, some clear insights were gained into the thrust bearing behaviour at the limit of hydrodynamic lubrication. In particular, a large spring-supported thrust bearing under a typical load with a common lubricant was shown to sustain predominantly hydrodynamic lubrication at rotational speeds as low as 10 rpm.
机译：对于低转子速度，通过实验检查了大型弹簧支撑推力轴承中的流体膜破裂。在这些条件下，润滑是流体动力而不是热流体动力，因此，寻求了流体动力润滑的极限。推力轴承测试设备用于测试三种具有不同负载，速度和润滑剂粘度的轴承。测量功率损耗和油温，并使用基本理论将这些测量值与轴承中的摩擦力和平均流体膜厚度相关联。基于功率损耗测量结果，开发了无量纲性能数并将其与摩擦系数相关联。确定了在流体动力润滑极限下的液膜润滑故障，以求出平均性能数。通过比较根据测量结果计算出的摩擦力和薄膜厚度与综合软件包的预测结果，探索了实验结果的准确性。获得了一些一般性协议。基于典型的表面粗糙度测量值，还检查了λ比与改进的性能值之间的关系。尽管开发的程序不能提供很高的精度，但是在流体动力润滑的极限下，对推力轴承的性能有了一些清晰的认识。特别是，在典型的载荷下，使用普通润滑剂的大型弹簧支撑推力轴承显示出在低至10 rpm的转速下主要维持流体动力润滑。

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