A 3D numerical simulation software was developed to calculate the tip-clearance flow of ATS-2,a high-loading transonic compressor,and the results were compared with the experiments.The results of numerical simulation are in accordance with that of experiments.The comparison between the viscous and non-viscous simulations shows that the intensive blockage area is caused by shock-leakage flow interaction.The viscosity weakens the blockage area,both in size and intensity.With the increase of the tip-clearance,the blockage area grows in the radial and axial directions with the total pressure ratio,efficiency and mass flow decreasing.
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