Research on the Influence Law of Fuel Supply Parameters on the Thermal Analysis of Rolling Bearings in Aero Engines

The conflict between the high performance requirements of aero engines and the heat generation problem of main shaft bearings is becoming increasingly severe. The oil supply parameters of rolling bearings (oil supply temperature, oil supply flow rate) are closely related to the heat generation of rolling bearings and the cooling effect of lubricating oil, which determine the service life and performance of the bearings. This paper takes the main shaft bearing of an aero engine as the research object, considering the interaction forces among the rolling elements, inner rings, cages and other components inside the bearing as well as the lubricating oil. A distributed heat generation model based on pseudo-dynamic analysis is established to analyze the influence laws of different oil supply parameters on the local heat generation characteristics and thermal state parameters such as oil film thickness of the rolling bearing. Finally, the accuracy of the heat generation model established in this paper was verified through experimental comparison. The results show that the flow rate of lubricating oil mainly affects the oil-gas viscous friction in the bearing. The higher the lubricating oil volume, the greater the oil-gas viscous friction loss and the thicker the lubricating oil film at the rolling friction surface. The temperature of the lubricating oil is the opposite. This can provide a reference for the determination of the optimal oil supply parameters for subsequent rolling bearings and the design of the lubricating oil system for aero engines.