초록 ▼

An inlet flow control system disposed within a nacelle includes a panel on an inner surface of that nacelle. The panel includes a noise attenuation layer that dissipates noise energy. A vacuum source generates a pressure differential across the noise attenuation layer for drawing airflow through the

An inlet flow control system disposed within a nacelle includes a panel on an inner surface of that nacelle. The panel includes a noise attenuation layer that dissipates noise energy. A vacuum source generates a pressure differential across the noise attenuation layer for drawing airflow through the panel and away from an inner surface of the nacelle.

대표청구항 ▼

1. A method for preventing separation of air flow from an inner surface of a nacelle for a gas turbine engine comprising the steps of: communicating air along the inner surface of the nacelle with a noise attenuation structure, wherein the noise attenuation structure comprises a face sheet including

1. A method for preventing separation of air flow from an inner surface of a nacelle for a gas turbine engine comprising the steps of: communicating air along the inner surface of the nacelle with a noise attenuation structure, wherein the noise attenuation structure comprises a face sheet including a plurality of openings communicating with a plurality of cells with uninterrupted solid walls, and a back sheet supporting the plurality of cells and including a plurality of openings in communication with the plurality of cells;generating a pressure differential to draw a portion of air flow along the inner surface through the noise attenuation structure and into a plenum in communication with the back sheet and each of the openings in the back sheet that correspond with the plurality of cells; andexhausting the portion of air flow drawn through the noise attenuation structure out of the nacelle with a vacuum source that draws air through the noise attenuation structure and away from the inner surface of the nacelle. 2. The method as recited in claim 1, including the step of communicating the pressure differential with substantially the entire back sheet of the noise attenuating structure. 3. The method as recited in claim 1, comprising generating a vacuum pressure with a vacuum pump. 4. The method as recited in claim 1, comprising generating a vacuum pressure with an ejector in communication with a plenum in communication with the noise attenuation structure. 5. The method as recited in claim 1, comprising varying the pressure differential to tailor the amount of air flow drawn away from said inner surface to current operating conditions. 6. The method as recited in claim 1, comprising the step of exhausting air drawn through the noise attenuation structure out through an outer surface of the nacelle. 7. The method as recited in claim 6, wherein the outer surface of the nacelle is disposed radially outward of the noise attenuation structure.