On the Performance of Hybrid Thrust Bearings: Recess Design and Lubricant Influences

Abstract

Abstract. Hybrid thrust bearings are essential components in high-performance turbomachinery, particularly in applications experiencing significant static axial loads or dynamic axial load fluctuations. Their ability to combine hydrostatic and hydrodynamic lubrication mechanisms results in superior stiffness and load-carrying capacity, crucial for maintaining rotor stability and precision. This paper investigates the relationship between recess design parameters and lubricant properties to optimize the performance of hybrid thrust bearings across a wide spectrum of operating conditions. The research encompasses a comprehensive analysis of various recess configurations. The impact of the recess geometric parameters on performance of thrust bearing is evaluated for a diverse range of lubricants, encompassing gas like air, water, and cryogenic fluids such as liquid methane and liquid oxygen. By meticulously considering factors such as static thrust load, rotational speed, and fluid supply pressure, the study aims to provide an extensive understanding of bearing behavior. The influence of recess design on critical performance metrics, namely, stiffness and load capacity, is thoroughly assessed. This comprehensive analysis facilitates the development of a robust design framework, offering practical guidelines for tailoring bearing geometry to specific lubricants and operational requirements. Furthermore, the research delves into the interplay between lubricant properties and the bearing's recess configuration under specific machinery operating conditions. This investigation elucidates optimal design strategies for achieving superior performance in diverse applications, including cryogenic environments and high-speed machinery. The findings contribute valuable insights to the field of fluid film bearings for cryogenic applications, enabling engineers to design more efficient and reliable hybrid thrust bearings for the demanding requirements of modern machinery.