... of the axial starting point of the rotatable ring in the controllable speed casing on stability enhancement and performance. Additionally, the study sought to unveil the action mechanism of the rotating casing on various flow elements within the tip passage. The findings indicated that the optimal axial...

..., the stability-enhancing effect decreases with increasing belly size. In particular, for the groove configurations at 23 % c a x and a more downstream location, such as 53 % c a x , a pronounced positive influence of the belly is evident. These results suggest that the belly and groove...