The effect of slot inlet angle and turning angle on flow field characteristic of cascade with slot was studied numerically.The result shows that slot outlet jet can blow off separation flow of boundary layer on the trailing edge of suction surface and enhance cascade performance.An optimal slot inlet angle exists

at which the cascade performance is best.When the slot inlet angle increases from the optimal point

the flow loss increases due to larger geometrical turning angle of the slot

which in turn leads to a lowered speed of slot outlet jet and consequently

its effect is reduced.When the slot inlet angle decreases from the optimal point

the accelerating effect of slot is reduced due to less differential static pressure

thus the effect of jet would also be reduced.