Process and device for reducing the drag in the rear region of a vehicle, for example, a road or rail vehicle or the like

A device for reducing drag in a rear region of a vehicle by increase of Bernoulli's total pressure in the rear region, the rear region having a separating line and an eddying zone, the device comprising:

• first openings at the separating line, said first openings providing initially tangential blown-out air for a kinetic energy increase of the eddying zone;
• an exterior wall at the rear region of the vehicle and which borders on the eddying zone, the exterior wall having a shape such that said blown-out air, while utilizing the Coanda effect, is deflected from an initial flow direction into the eddying zone;
• second openings in said exterior wall through which air from the eddying zone is sucked;
• and
• blowers for blowing the blown-out air through the first openings and for sucking the air through the second openings, wherein at least one of the blowers is a cross-flow blower corresponding to a slot length of one of the first openings.