A three-dimensional numerical simulation of the rim seal of a high-pressure turbine was carried out. To reveal the sealing efficiency and the flow field characteristics in the cavity

different parameters of axial and radial clearances were analyzed. Results showed that the sealing ring divided the disk cavity into an outer cavity and an inner cavity. The outer cavity could effectively resist the mainstream gas

therefore the inner cavity had a higher sealing efficiency. With the increase of axial clearance

the overlap length and the resistance of the coolant flow decreased

so the sealing efficiency of the disk cavity was improved. With a constant axial clearance

the radial distance of the outer cavity decreased as the radial distance decreased. The sealing efficiency at the lower radial region could be improved.