Abstract
The switching characteristic of the unvented wall reattachment fluidic device is very much affected by the load. Generally, the larger the load resistance is, the smaller the switching control flow rate becomes.
In this paper, firstly we investigate experimentally the mechanism of such a switching, the load switching, to establish its theoretical treatment. We make it clear that the main jet detaches from a side wall over to the opposite wall when the pressure gradient along the reattachment wall becomes positive everywhere downstream of the reattachment point under the effect of the pressure rise caused by the load. On the basis of this result, we formulate a switching criterion and develop an analytical model of the load switching.
The calculated results can satisfactorily predict the load switching phenomena for a given geometry and load condition of the device, and are useful for analysis and design of the unvented wall reattachment devices.
