Patent ID: 7997061

Claim:
A propulsion unit comprising: a turbojet engine including— a fan having an airstream inlet, a plurality of rotating blades, and an airstream outlet, a static, air-stream guiding blade positioned at the airstream outlet of the fan, the guiding blade having an interior volume bounded by one or more panels; a thermal exchanger positioned above the turbojet engine; a cooling air lead-in conduit adapted to supply the thermal exchanger with cool air tap, the cooling air lead-in conduit being in fluid communication at a first end with the interior volume of the guiding blade, and the thermal exchanger at a second end; and a regulation device adapted to regulate an air flow rate of cool air in the cooling air lead-in conduit, the regulation device including— a door shiftably coupled to a panel of the guiding blade, the door being shiftable between an open position in which at least a portion of cool air from the airstream outlet of the fan is deflected into the interior volume of the guiding blade and into the cooling air lead-in conduit, and a closed position in which the cool air from the airstream outlet of the fan is blocked from entering the interior volume of the guiding blade, and therefore the cooling air lead-in conduit.