1. Actuation
Time instants of pulsed jet
(a)
(b)
(c)

2. Results
Velocity vectors and vorticity contours along a plane D, no control (left) and control (right).
Actuator increases back pressure, no secondary frequencies introduced so it does not suffer from nonlinear interactions

3. Vortex Patterns
Visbal and Gursul call it “dual vortex structure”

4. PIV results (cont.)
Planes 2(z/b= 0.209) and 3 (z/b= 0.334) with actuation.
Steady profiles are not smooth and tend to even out after z/H=4.
Deviation from centerline is more pronounced for pulsating and jet is also more compact.

5. Results (cont.)
Plane A, control, t=0,t=T/8

6. Results (cont.)
Plane A, control, t=2T/8,t=3T/8

7. Results (cont.)
Plane A, control, t=4T/8,t=5T/8

8. Results (cont.)
Plane A, control, t=6T/8,t=7T/8

9. Results (cont.)
Plane 8, t=0
No control Control

10. Results (cont.)
Plane 8, t=T/8
No control Control

11. Results (cont.)
Plane 8, t=2T/8
No control Control

12. Results (cont.)
Plane 8, t=3T/8
No control Control

13. Results (cont.)
Plane 8, t=4T/8
No control Control

14. Results (cont.)
Plane 8, t=5T/8
No control Control

15. Results (cont.)
Plane 8, t=6T/8
No control Control

16. Results (cont.)
Plane 8, t=7T/8
No control Control

17. Results (cont.)
Planes B and C, control

18. Results (cont.)
Plane 10, t=0
No control Control

19. Results (cont.)
Plane 10, t=T/8
No control Control

20. Results (cont.)
Plane 10, t=2T/8
No control Control

21. Results (cont.)
Plane 10, t=3T/8
No control Control

22. Results (cont.)
Plane 10, t=4T/8
No control Control

23. Results (cont.)
Plane 10, t=5T/8
No control Control

24. Results (cont.)
Plane 10, t=6T/8
No control Control

25. Results (cont.)
Plane 10, t=7T/8
No control Control

26. Results (cont.)
Plane D, no control and control