Abstract: In one example, a structure in a fluid flow is disclosed, which may include a first surface defining at least one slot, a second surface facing opposite to the first surface and defining at least one slot, and at least one first channel defining a fluid flow path between the at least one slot in the first surface and the at least one slot in the second surface. Further, the structure may include a pressure sensing and control unit coupled to the at least one first channel. The pressure sensing and control unit may include a pressure sensor to determine a differential pressure between the first surface and the second surface, and a controller to control fluid flow through the at least one first channel based on the differential pressure.