Abstract
The authors have systematically investigated the effects of vent and sharp splitter on the reattached jet in a wall-reattachment fluidic device.
As reported in this paper, including the results for the cusped splitter and the pentagonal one, the effects of vent and splitter on the reattached jet behaviour, its switching, and the recovery pressure were experimentally investigated.
According to these results, the geometrical configuration of the device was discussed from the viewpoint of designing the wall-reattachment fluidic device.
The results can be summarized as follows:
(1) The cusped and the pentagonal splitters do not suppress the bubble expansion of reattached jet unlike the sharp splitter.
(2) The switching modes can be classified into the splitter switching and the contacting-both-walls one except for the cusped splitter. The splitter switching for the device with vents can be practically treated as the terminated-wall switching.
(3) The optimal configuration of the vent and splitter to give a maximum recovery pressure is made clear.
(4) It is clearly shown that the straightforward design was possible, when the recovery pressure was accepted as one of the performance indexes of the device.
