Abstract
The air/oil two-phase flow is extremely complex in the aero-engine bearing chamber, so the comprehensive understanding of the flow phenomenon is helpful to improve the design of the lubrication and heat exchange system. In this paper, transient CFD simulation is developed to analyse the air/oil two-phase flow in the bearing chamber. The velocity and temperature distributions of air and oil with time and space are discussed. The results show that under the periodic conditions, the velocity and temperature of the air and oil in the bearing chamber present quasi periodic characteristics. And the velocity and temperature distribution of air/oil two-phase flow in bearing chamber is independent with time in the bearing chamber. The research work will contribute to understand the nonlinear characteristics of air/oil two-phase flow in the bearing chamber.
Highlights
Design of aero-engine lubrication system and secondary air flow system depends on the understanding of complicate air/oil two-phase flow in the bearing chamber
Lubricating oil and sealing air in the bearing chamber formed a complex air/oil two-phase flow, which results the design of the lubrication system is very difficult [1]
The reason is that periodic air mass flow rate and periodic oil volume rate were given as initial conditions, but a large number of oil droplets and the secondary oil droplets exist in the bearing chamber, which results that the velocity distributions of air and oil change with time at the same position
Summary
Design of aero-engine lubrication system and secondary air flow system depends on the understanding of complicate air/oil two-phase flow in the bearing chamber. Chen Guoding et al [6] discuss the effect of the structure parameters of bearing chamber and working conditions on flow patterns, reveal the pressure and velocity distribution laws under different rotating speed. Ao Wenwei et al [7] utilize CFD software to simulate the air/oil two-phase flow in the bearing chamber, and analyses the influence of operating conditions on the flow state of the lubricating medium. Lubricating oil and sealing air in the bearing chamber form a complex air/oil two-phase flow. Lubricating Oil deposits on the wall of the bearing chamber, and the air/oil two-phase flow states of the air and oil film is formed. The equations of continuity, momentum and energy conservation equations are used to describe the air/oil two-phase flow state in the bearing chamber, and the expressions of the 3 governing equations are as follows: 3.1 Geometry model and mesh. The whole mesh quality is more than 0.3, which meets the requirements of the calculation
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