# Research on Temperature Field Analysis Method of High-Speed Bearing Chamber-Bearing System
###### Abstract
They utilized empirical formulas to estimate friction heat and the heat transfer coefficient. The application of this model yielded reasonable calculation results that met the accuracy requirements for practical applications. Building on the capabilities of ANSYS and APDL, [PERSON] et al. [8] derived heat transfer characteristic curves for the bearing chamber under various oil supply volumes and temperatures. This was achieved through finite element modeling and the application of loading boundary conditions, thereby simplifying the thermal analysis of the oil system. Accurately simulating the effects of rotational motion and oil flow on the heat transfer characteristics of a system using the finite element method (FEM) can be challenging. Consequently, the finite volume method (FVM) has gained widespread application due to its consideration of fluid flow dynamics. Currently, the finite volume method for fluid-structure coupling is predominantly used. While the FVM can achieve higher temperature calculation accuracy compared to the FEM, the implementation of fluid-structure coupling within the FVM leads to a vast number of grid cells and a significant computational workload. This results in certain limitations in terms of computational feasibility and efficiency. [PERSON] [9] established a simplified geometry of the bearing chamber located behind the turbine. Through reasonable meshing, boundary condition setup, and experimental validation of the multiphase flow model and turbulence model, a numerical simulation was initiated to investigate the fluid-structure coupling heat transfer characteristics within the bearing chamber. The distribution of velocity, pressure, temperature, and volume fraction of oil within the bearing chamber was obtained. [PERSON] et al. [10] developed an analysis model for grease flow within the bearing chamber and conducted a detailed analysis of the flow field characteristics in a grease-lubricated bearing chamber. The feasibility of the simulation model was confirmed by comparing the simulated values of the bearing inner ring's temperature rise with experimental values. [PERSON] [11] performed a numerical study on the flow and heat transfer characteristics of an aero-engine bearing chamber. Initially, the overall structure of the bearing chamber was divided into several independent calculation domains, and partitioned fluid-structure coupling calculations were conducted. Subsequently, the overall structure of the bearing chamber was reasonably simplified based on the partition calculation results, and a numerical study of the flow and heat transfer characteristics of the entire bearing chamber was carried out. Ultimately, the distributions of the pressure field, temperature field, and velocity field across the entire bearing chamber were obtained. Recent literature [12; 13; 14; 15; 16; 17] focuses on carrying out the laws of heat transfer and flow in the bearing body, but there are relatively few studies in this field that simultaneously carry out convective heat transfer and thermal analysis of multiple-bearing-axis systems. In summary, within the realm of thermal analysis for bearing chambers, the primary methods employed are the thermal network method, the finite element method (FEM), and the finite volume method (FVM) for fluid-structure coupling. Among these, the finite volume method (FVM) has garnered growing interest and application from researchers due to its high precision in temperature field calculations, which is attributed to its consideration of bearing rotation and fluid flow dynamics. Building upon the FVM, this article introduces a decoupling method that separates fluid motion from the thermal analysis of the solid temperature field. This approach is applied to study the temperature field distribution within a high-speed ball bearing chamber-bearing system using ANSYS Fluent. In a bearing chamber-bearing system, after lubricating oil enters the bearing through nozzles, the heat generated by bearing friction is transferred to the lubricating oil by convection heat exchange.