Electric propulsion unit of an aircraft comprising a cooling system incorporating at least one front air inlet and aircraft comprising at least one such electric propulsion unit

An electric propulsion unit of an aircraft comprising:

• at least one electric power system,
• at least one electric motor powered by the electric power system and comprising an output shaft,
• a propeller driven in rotation by the electric motor,
• a cooling system for the electric power system comprising a main cooling circuit which comprises:
• a main air inlet,
• at least one intake duct,
• at least one main heat exchanger thermally connected to the electric power system,
• at least an exhaust duct,
• a main air outlet,
• a nacelle housing the electric power system and the electric motor and comprising:
• a central fairing,
• a front fairing which extends from the central fairing to a front end, and
• a rear fairing which extends from the central fairing to a rear end,
• wherein the front fairing comprises a protrude positioned in a lower part of the front fairing, said protrude having a front face located in a transverse plane perpendicular to the output shaft, the main air inlet being positioned on the front face,
• wherein the main cooling circuit is sized for the cooling needs of the electric power system during a cruise flight, and
• wherein the cooling system comprises at least one secondary cooling circuit which comprises:
• a secondary air inlet on a side face of the central fairing,
• at least one intake duct,
• at least one secondary heat exchanger,
• at least one exhaust duct, and
• a secondary air outlet aft of the main air outlet,
• said at least one secondary cooling circuit being sized to increase a cooling capacity of the cooling system.