Motion of wall oil film with consideration of oil-gas coupled heat and mass transfer in bearing chamber

In order to study the oil/gas two-phase flow and motion characteristics of wall film in the aero-engine bearing chamber, the oil /air two-way coupled mathematical model and the oil film heat and mass transfer movement model were established. The oil/gas two-phase flow field and the motion characteristics of wall film with the oil flow rate were calculated, and the flow field characteristics, the thickness and circumferential velocity distribution of wall film were obtained. The results here show that, the flow field difference between two-way and one-way coupled calculation is at least 10%, and therefore the effects of oil droplets on air flow cannot be ignored in the calculation of two-phase flow. The oil vapor mass fraction in the bearing chamber is less than 0.05%, which indicates that the drag effect produced by viscous forces between the oil droplets and air is the main factor affecting the flow field. Both the oil film thickness and circumferential velocity show a trend of increasing with the increasing of the lubricating oil flow rate, but the increasing is not proportional to the increase amplitude of oil flow rate. Besides, the verification with the experimental data proves that the mathematical analysis model here is reasonable and effective.