Detailed experiments were carried out to investigate the effect of the tip clearance flow in a turbine cascade with different width pressure-side winglets.The flow field of the cascade outlet and the static pressure distribution on the blade surface were surveyed in detail at different tip clearance height of 0.5%h

1%h

1.5%h.The results show that

as the tip clearance height increases

the leakage flow is intensified

the leakage vortex is strengthened

the total loss of cascade is increased

and the up channel vortex is weakened.Pressure-side winglet has a good effect at the 0.5%h tip clearance height

the total loss of the cascade is reduced by 18% with width being 0.4 times of the local blade thickness.0.3 times of the local blade thickness case reduces the total loss of the cascade by 10.37% at the 1%h tip clearance height.At the 1.5%h tip clearance height

the pressure-side winglet almost has no effect on clearance leakage flow

but reduces the total loss of the cascade to a certain extent.