Abstract: The design of secondary air flow system and lubrication system of aeroengine is dependent on an understanding of complex oil/air two-phase flow state in bearing chambers, including wall oil film physical property which influences the lubrication and heat transfer performance of bearing chambers. The mass and momentum of oil droplet transfer are closely correlated with wall oil film thickness and velocity, and determine the initial film state under oil/air two-phase flow condition in bearing chambers. Through analyzing the correlation of oil droplet diameter distribution parameters with the chamber geometry and relevant operating conditions, and droplet mass distribution based on continuous diameters is obtained. Then deposited mass and transfer momentum upon droplets/wall impact are calculated. Influences of geometry and operating conditions on deposited mass and transfer momentum are discussed in the form of dimension-parameter. The feasibility of the calculation method is investigated by using a certain bearing chamber model under relevant operating conditions. The studies on deposition properties in combination with droplet diameter distribution and physical characteristics of oil film formation process, as well as the influence law of dimension-parameter on deposited mass and transfer momentum, contribute to follow-up research work on oil/air two-phase flow in aero engine bearing chambers.

Key words: Bearing chamber, Droplet, Oil film, Oil/air two-phase