Aiming at reducing the cascade total pressure loss and improving the cascade aerodynamic efficiency under constant boundary conditions and flows

optimization on aerodynamic performance of a group of stator cascades was conducted by turbomachine optimization design module Design-3D in the commercial CFD software NUMECA

with the blade incidence of 4.12°

-5.88°

-15.88°

-45.88° and -65.88°.The results show that

the cascade isentropic efficiency increased and the total pressure loss decreased under all five conditions.Analysis on flow characteristics of the cascade before and after the optimization presented that

the optimized blade reduced the secondary flow in the cascades and played a role in controlling the flow separation under large negative incidences.