BVF application on blowing control of flow separation of a compressor cascade

Controlling flow separation with blowing-slot was simulated numerically on a 2-D cascade 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.BVF aerodynamics analysis indicates that the high positive peak of BVF is a sign of large scale flow separation,BVF distribution and cascade performance are interrelated,the blowing can adjust BVF distribution well to improve the performance.The best slot position is located behind the positive BVF peak 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.