The numerical simulation of oil-gas two-phase flow and heat transfer of complex rotating multi-cavity system in aeroengine air system and lubrication oil system were studied

and the flow and heat transfer characteristics were analyzed. Mixture model and Eulerian model were used to calculate the velocity

pressure and temperature of a multi-inlet and multi-outlet rotating multi-cavity system of the typical small turbofan engine

which consists of cavities behind and in front of the fan disc

the front bearing chamber

and the cavity in front of the axial-flow disc. Result shows that under same calculation condition

the velocities of two models are similar; the pressures are slightly different only in cavity in front of the axial-flow disc

where the pressure of Eulerian model is 93% of the Mixture model; the temperature of Mixture model is higher

and the front and back bearing temperature of Eulerian model is 93% and 94% of Mixture model

respectively; Mixture model costs 63% of the time of Eulerian model in one iteration.