A turbine disc-cavity cooling configuration of an aero-engine was simplified to a rotor-stator cavity model with high-positioned pre-swirl nozzle.The influences of rotor-stator gap

cooling air flux

rotational Reynolds number and swirl ratio on the drop of cooling air temperature and heat transfer on the rotor were experimentally investigated by using advanced temperature measurement technology of the thermochromic liquid crystal.The experimental results indicate that

the high-positioned pre-swirling inflow yields outstanding cooling effect on the rotor fringe

and the temperature of the rotor is distributed in the shape of concentric circle;the drop of cooling air temperature diminishes with the increase of rotational Reynolds number and rotor-stator gap

or with the decrease of cooling air flux

meanwhile

the cooling effect on the rotor becomes worse.