Method and the system for decreasing resonance in a chamber

摘要

A turbofan engine assembly (10) includes a core engine (12), a fan (14), a fan bypass duct (42) partially surrounding the core engine and the fan, and a bleed system (100). The bleed system includes a first bleed circuit (102) configured to bleed pressurized air from the core engine and channel the flow to a first circuit (108) of a heat exchanger (106), and a second bleed circuit (104) configured to bleed fan air from the fan bypass duct and channel the flow to a second circuit (110) of the heat exchanger. The second bleed circuit includes a bleed duct (114) including a duct inlet and a duct outlet (118) coupled in flow communication with the heat exchanger through a valve. The bleed duct also includes an acoustic suppression conduit extending from the bleed duct upstream of the valve to the fan bypass duct and sized to suppress pressure oscillations inside the second bleed circuit when the valve is at least partially closed.