Numerical Simulation Of Two-phase Flow And Heat Transfer In An Aero-engine Bearing Chamber

During the operation of aero-engines,in order to ensure the normal operation of the engine,it is necessary to lubricate and cool the bearings,gears and other components through a lubrication system.As the performance of aero-engines improves,higher requirements are placed on the reliability of the lubrication system.The bearing chamber is a very important part of the lubrication system.When the engine is running,the reliability of the bearing chamber has an extremely important effect on the lubrication system and the stability of the entire engine.Studies show that it’s not just bearings that are prone to accidents in aero-engine bearing chambers.The research on the two-phase flow and heat transfer characteristics in the bearing chamber has also been a hotspot for aero-engine designers.In this paper,the aero-engine bearing chamber is simplified based on the research status.The multi-phase flow VOF model and standard turbulence model combined with multiple reference coordinate system were used to calculate the three-dimensional unsteady fluid-structure interaction of the simplified bearing chamber model.The oil distribution,fluid temperature field and shell temperature distribution in the bearing chambers were calculated under different conditions of shaft rotation speed,oil flow rate and wall contact angle.Analysis of the impact of various parameters provides a certain reference for the design and theoretical research of aero-engine bearing chamber.The calculation results show that the rotation speed of the shaft,the oil flow rate and the wall contact angle all have a greater impact on the flow and heat transfer in the bearing chamber.Among them,the effect of the rotation speed is the largest,and the effect of the wall contact angle is the most complicated.Conclusions after analyzing the effects of various parameters: In order to ensure the stability of aero-engine operation,researchers should focus on the heat bearing capacity and safety performance of the vicinity of the bearing,the ventilation duct and the upper half of the bearing chamber when designing the bearing cavity.It is also necessary to choose the material of the appropriate wall contact angle and establish restrictions on the shaft rotation speed and oil flow rate.