Wall pressure distribution induced by saw-tooth flap

Wall pressure distribution induced by the saw-tooth flap has been investigated with electronic pressure scanner in wind tunnel. The results show that the shear layer of the saw-tooth flap separates at x/h=-6 up-stream and reattached at x/h=20 downstream, which is the same with the plate flap; the transverse location of the flap has little influence on the mean pressure distribution, and the distribution of pressure fluctuation along the saw-tooth groove is greater than that along the saw-tooth tip; the saw-tooth can block the flow and much more effectively reduce the pressure fluctuation downstream.