Method and apparatus for protecting vehicles against reconnaissance by IR-IMAGING equipment

摘要

An arrangement for the protection of vehicles against IR-IMAGING equipment by cooling air, in which the hot or warm exhaust gases are surrounded by a laminar flow of cooling air. The outside air which is drawn in by the cooling mechanism or the motor ventilation system, is first moved over the thermally radiating areas of the vehicle, and then to the cooling unit or the motor itself for combustion. Part of the outside air which is drawn in, serves as the laminar cover stream of the transferred heated-up cooling air and/or the exhaust gases. These exhaust gases, the heated up cooling air and the surrounding outside air represents a coaxial system of gas flows. In the center of this system, flow the exhaust gases, and the heated-up cooling air flows in the central annular portion. The outside air is directed through the outside annular flow portion of the coaxial system. Two separate ventilation systems are used for drawing in the air for cooling and combustion, as well as for drawing in the air of the cover system. The surrounding outside air may be accelerated additionally by an annular fan and then narrowed by means of a nozzle in its cross section. The coaxial system of gas flows is directed through a bent turnable and removable outlet tube, so that viewing into the inner hot parts of the exhaust pipe system may be avoided. The drawn-in outside air may be led through the intermediate space of a binding cover system above or below the outer surface or shell of the actual vehicle.