Diffuser arrangement
AssigneeROLLS-ROYCE plc
InventorsAlastair D Walker, Paul A Denman
Life of this patent
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Abstract
A diffuser arrangement is provided in which a wall surface of the diffuser arrangement incorporates an upstream part and a downstream part with an aperture between them. There is a step displacement between the upstream part and the downstream part along with specific shaping of the leading edge of the aperture whereby fluid air flow is drawn into the aperture from a fluid flow whilst avoiding undue disturbance to that flow. The present diffuser arrangement allows incorporation within an engine without complex fabrication or structural requirements.
Claims17
A diffuser arrangement of a combustor for an engine, the diffuser arrangement located upstream of the combustor and comprising a wall surface in a fluid flow conduit formed with an aperture between an upstream part of the wall surface and a downstream part of the wall surface, the downstream part having a step displacement away from a projected profile projected in the downstream direction of the upstream part of the wall surface whereby in use flow momentum in a fluid flow past the wall surface facilitates flow bleed into the aperture;
- wherein the step displacement is between 0.05 to 0.12 of either the conduit radius or half the conduit cross-sectional width;
- the aperture has a width at the wall surface between 0.04 to 0.07 of either the conduit radius or half the conduit cross-sectional width.
Dependencies are inferred from the claim text.