Resumen
The invention relates to a system for reducing the fluid-dynamic friction resistance of a fluid stream comprising a fixed chassis with a first and second fixed wall (1, 2), in contact with the fluid stream, joined by an inner wall (3) defining a cavity (4); and a sliding means arranged in said cavity (4) comprising a front and rear cylinder (5, 6), and a passive sliding treadmill (7), with an internal face, containing the front and rear cylinder (5, 6), an external face with an outer surface, facing the fluid stream, and an inner surface, facing the inner wall (3); defining a fluid inlet (10) and outlet (11) joined by an inner channel (12) such that, in use, it is crossed by a Couette flow with a direction opposite to the fluid stream. (Machine-translation by Google Translate, not legally binding)