Heat exchanger assembly for an aircraft

An aircraft propulsion system comprising:

• a nacelle forming an aerodynamic cover for the propulsion system, the nacelle including an external skin;
• and
• a heat exchanger assembly disposed on the external skin, the heat exchanger assembly including:
• a housing including an inner flow path wall, an outer flow path wall, an inner inflatable diaphragm, and an outer inflatable diaphragm, the inner inflatable diaphragm mounted to the inner flow path wall, the outer inflatable diaphragm mounted to the outer flow path wall, the inner inflatable diaphragm and the outer inflatable diaphragm forming a venturi channel therebetween, the inner flow path wall and the outer flow path wall forming an air inlet and an air outlet, the housing configured to direct air along an air flow path from the air inlet, through the venturi channel, and to the air outlet;
• a heat exchanger disposed downstream of the venturi channel within the air flow path;
• and
• a nozzle including a nozzle housing disposed within the air flow path, the nozzle housing forming a nozzle inlet and a nozzle outlet, the nozzle outlet disposed at the venturi channel.

An aircraft propulsion system comprising:

• a heat exchanger assembly including:
• a housing including an inner flow path wall, an outer flow path wall, an inner inflatable diaphragm, and an outer inflatable diaphragm, the inner inflatable diaphragm disposed at the inner flow path wall, the outer inflatable diaphragm disposed at the outer flow path wall, the inner inflatable diaphragm and the outer inflatable diaphragm forming a venturi channel therebetween, the housing configured to direct air along an air flow path through the venturi channel;
• a heat exchanger disposed downstream of the venturi channel within the air flow path;
• a nozzle including a nozzle housing disposed within the air flow path, the nozzle housing forming a nozzle inlet and a nozzle outlet, the nozzle outlet disposed at the venturi channel;
• and
• a control valve connected in fluid communication with the nozzle inlet, the inner inflatable diaphragm, and the outer inflatable diaphragm, the control valve configured to control a first flow rate of pressurized air directed to the nozzle inlet, the inner inflatable diaphragm, and the outer inflatable diaphragm;
• and
• a control system including a processor in communication with a non-transitory memory storing instructions, which instructions when executed by the processor, cause the processor to:
• control a position of the control valve to control a second flow rate of air along the air flow path.