Numerical Study of the Purge Flow’s Effect on the Loss Mechanism of the Blocking and Shear Effects

The loss mechanism of shear and upstream blockage caused by the interaction purged flow ingested gas needs to be systematically studied optimize near rim. In order study causes influence factors blocking shearing effects quantify their losses reasonably, three-dimensional unsteady numerical method validated experiment data was adopted turbine with three kinds sealing structures. block are quantified integrating dissipation coefficient in volume where specific aerodynamic occurs. result indicated that there a larger radial velocity smaller tangential relative main effect. Therefore, its is affected seal structure. effect mainly gradient axial cavity exit. contribution increased enlarged efficiency. Through research, it clear increasing purge flow’s beneficial reducing has positive significance for weakening channel. Furthermore, structure on must particularly considered since both related