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US 9,964,114 B2Granted
Flow outlet
AssigneeROLLS-ROYCE plc
InventorOliver C Taylor-Tibbott
Life of this patent
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Abstract
A noise attenuation panel for a bleed flow is presented that causes a total pressure loss of the bleed flow before it is exhausted. The total pressure loss results from at least two regions in which the flow area contracts and then rapidly expands, with the rapid expansion causing mixing and turbulence rather than full total pressure recovery. This reduced pressure means that when the flow is exhausted into a flow (which may be the bypass flow of a gas turbine engine), its energy, and thus its noise, are reduced.
Claims13
A noise attenuation panel for a gas turbine engine comprising:
- a plurality of flow passages, wherein:
- each flow passage comprises a flow inlet and a flow outlet and changes direction at least once between the flow inlet and the flow outlet;
- a flow area through the flow passage increases downstream of the flow inlet and decreases into the flow outlet;
- a flow area of the flow outlet is bigger than a flow area of the flow inlet;
- the flow inlets form a first planar surface and the flow outlets form a second planar surface offset from the first planar surface;
- the noise attenuation panel has a longitudinal axis that passes through a center of the noise attenuation panel and is perpendicular to the first planar surface or the second planar surface;
- the noise attenuation panel has a plane extending along the longitudinal axis and along a centerline of the noise attenuation panel;
- and
- the noise attenuation panel is achiral with respect to the longitudinal axis within the plane.
6 more elements
Dependencies are inferred from the claim text.