To study the leakage characteristics of floating ring seal under different temperatures

pressures and rotational speeds

a numerical calculation model with CFD was built. The leakage characteristics of floating ring seal used in a specific aero engine were analyzed. For the change of leakage caused by rotational speed

a way was proposed to calculate the centrifugal expansion of rotor at different rotational speeds by finite element method

and to change the flow field size according to the centrifugal expansion. The change of state parameters of fluid caused by temperature and differential pressure was calculated by state equation

and the related parameters in constitutive equation were redefined. To verify the numerical calculation model

experimental study of leakage characteristics of floating ring seal under simulating real conditions was developed. Results showed that with the increase of differential pressures

computational results kept approaching the experimental results; when the differential pressures were greater than or equal to 0.1 MPa

the average deviations between computational results and experimental results were between 6.08%-9.43%.