TURBOFAN ENGINE, COOLING SYSTEM AND METHOD OF COOLING AN ELECTRIC MACHINE

A gas turbine engine (10) has an air mover (12) configured for generating a flow of air around a rotation axis (11); a surface (34) extending around the rotation axis delimiting a passage (32) for the flow of air downstream of the air mover (12); an electric machine (40) disposed within the passage (32) and coupled to the air mover (12); a coolant circuit (102) having: an evaporator (104) circumferentially disposed around at least part of the electric machine (40) and in thermal communication therewith; a condenser (106) having a surface cooler (108) circumferentially disposed at least partially around the surface (34) and in thermal communication therewith; a first conduit(110) fluidly connecting an upper region (104a) of the evaporator (104) to an upper region (104a) of the condenser (106); and a second conduit (112) fluidly connecting a lower region (106b) of the condenser (106) to a lower region (104b) of the evaporator (104); and a coolant fluid (120) in the coolant circuit (102).