Turbofan duct with noise suppression and boundary layer control

Details Turbofan duct with noise suppression and boundary layer control Turbofan duct with noise suppression and boundary layer control

1985-12-24

1988-06-07

Peters, Jr., Joseph F.

Aeronautics and astronautics

Aircraft power plants

244 1N, 244130, 244209, 181214, B64C 2106

Patent

active

047491507

ABSTRACT:
A boundary layer control device is installed in the acoustically treated inlet duct of a turbofan engine. The device sucks off the turbulent boundary layer of air flowing over the inner or "air wetted" surface of the inlet during aircraft take-off, cruise and approach. The lip of the inlet can thus be made thinner to reduce drag during cruise without degradation of fan performance during take-off. The acoustic liner of the inlet comprises a microporous honeycomb sandwich structure through which air may be sucked at various locations through headers and conduits connected to an onboard pump.

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