This study combined axially non-uniform clearances and the squealer tip with experiments on a low-speed wind tunnel. The performance and flow structure were analyzed under design and off-design conditions. The results showed that the axially non-uniform clearances could be applied to the squealer tip. The energy loss coefficients were reduced in all cases considered in this study by axially non-uniform clearances （8.9% at most）. Meanwhile, the flow rate were strengthened. The low pressure zone of the leakage vortex went larger at the endwaU with the increasing of the attack angle, which delayed the leakage vortex raising from the endwall and induced a larger high-loss area downstream the cascade. Finally, the axially non-uniform clearances strengthed the level of under turning.
Journal of Engineering Thermophysics
axially non-uniform clearance