“…In addition, the labyrinth seal leakage flow of shrouded stator emerges from the upper cavity of shrouded stator, further reducing the hubside momentum; and the increased mass flow rate or reduced tangential velocity of labyrinth seal leakage flow further degrades compressor performances (Wellborn and Okiishi, 1999;Wellborn, 1999;Demargne and Longley, 2000;Kim et al, 2012;Marty and Aupoix, 2012;Schrapp et al, 2019). The low-momentum labyrinth seal leakage flow heads towards the stator pressure side (PS), then to the stator passage suction side (SS) due to the PS-SS pressure gradient inside the stator passage (Wellborn and Okiishi, 1996;Kim et al, 2012), This labyrinth seal leakage flow widens the width of the hubside low-momentum region and creates additional vortical structure nearby hubside corner separation.…”