Controlling flow separation with blowing-slot was simulated numerically on a 2-Dcascade in collaboration with boundary vorticity flux(BVF).The results show that steady blowing can take away the slow airflow of the boundary layer

the separated flow is controlled and the performance of cascade is greatly improved.By means of investigation on the cascade performance variation with slot position

blowing angle and slot width

the best slot scheme is obtained.BVFaerodynamics analysis indicates that the high positive peak of BVFis a sign of large scale flow separation

BVFdistribution and cascade performance are interrelated

the blowing can adjust BVFdistribution well to improve the performance.The best slot position is located behind the positive BVFpeak and in a small zone near separation point.By selecting an appropriate slot position

the best effect could be obtained in a wide operating range.