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.
Claims20
A noise attenuation panel for a gas turbine engine comprising:
- a plurality of flow passages, wherein:
- at least one flow passage comprises an inlet and an outlet;
- and
- the flow area through the passage increases downstream of the inlet and decreases into the outlet.
A method of manufacturing at least two identical achiral noise attenuation panels using additive layer manufacture, wherein:
- each noise attenuation panel comprises a first planar surface offset from a second planar surface along a longitudinal axis;
- each new layer formed in the manufacture is offset from the previously manufactured layer in a manufacturing direction that corresponds to the longitudinal direction of the noise attenuation panel;
- all of the layers of one noise attenuation panel are deposited before any of the layers of a subsequent noise attenuation panel are deposited;
- and
- the first planar surface of one noise attenuation panel is manufactured adjacent the first planar surface of an adjacent noise attenuation panel and/or the second planar surface of one noise attenuation panel is manufactured adjacent the second planar surface of an adjacent noise attenuation panel.
A method of manufacturing at least two identical achiral components using additive layer manufacture, wherein:
- each component comprises a first planar surface offset from a second planar surface along a longitudinal axis;
- each new layer formed in the manufacture is offset from the previously manufactured layer in a manufacturing direction that corresponds to the longitudinal direction of the component;
- the first planar surface of one component is manufactured adjacent the first planar surface of an adjacent component and/or the second planar surface of one component is manufactured adjacent the second planar surface of an adjacent component.
Dependencies are inferred from the claim text.