In order to investigate the flow and heat transfer performances in a pre-swirl rotor-stator cavity with two air inflows (central air inflow and pre-swirl inflow at stator rim respectively) and two outflows (radial outflow at ourter shroud and axial outflow at rotor rim respectively)

a numerical study is conducted by using RNG turbulent model.In the cavity

there are stator septa and rotor septa dividing the inner rotor-stator cavity from the outer pre-swirl cavity.Because of the periodic feature of the flow structure

one thirtieth of the cavity is considered as the computational field.The results show that the rotating Reynolds number

non-dimensional flow velocities

and pre-swirl ratio have different effects on the flow and heat transfer characteristics in the rotor-stator cavity.The synergism of pre-swirl and septa makes satisfactory shroud seals preventing the ingress of hot gas from flowing into the inner rotor-stator cavity and providing the cooling air flowing into blade-cooling holes.