Numerical study and validation for two-phase flow of oil and gas in aero-engine bearing cavity

In order to test whether the traditional one-way coupling model was suitable for flowfield calculation of two-phase flow of oil and gas in bearing cavity, two-way coupling model was established. The distributions of air velocity and turbulence kinetic energy in two model cavity after injecting oil with different rotation speeds, were comparative investigated. The data calculated by two-way coupling model were compared with the experiment data in the reference. Some important conclusions were found: in the two-way coupling model, the change law of air velocity distribution after injecting oil is similar with the one-way air flow. However, air velocity reduces markedly at every point and the difference of average air velocity is the maximum in the case of the rotation speed of 8 000 r/min between these two models; the influence of droplet motion and evaporation on air velocity and turbulence kinetic energy is significant, especially the air velocity which will drop 10%-15% due to the coupling effect of the droplets in mainstream chamber, indicating influence of droplets on the air field cannot be ignored.