Rolls-royce Corporation

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David G MacManus

Christopher T J Sheaf

Christopher Tj Sheaf

A nacelle for a gas turbine engine includes a leading edge at an upstream side of the nacelle. The nacelle further includes a trailing edge at a downstream side of the nacelle. The nacelle further includes an outer surface disposed between the leading edge and the trailing edge. The nacelle further includes a concave section continuous with the outer surface and disposed proximal to the trailing edge. The concave section includes an upstream end and a downstream end spaced apart from the upstream end. The concave section is curved radially inwards relative to the outer surface between the upstream end and the downstream end.

Nacelle for gas turbine engine and aircraft comprising the same

A nacelle for housing a fan within a gas turbine engine having a longitudinal centre line includes a leading edge and a trailing edge. A nacelle length (L) is defined as an axial distance between the leading edge and the trailing edge. An azimuthal angle (&#x3b8;) is defined about the longitudinal centre line. The nacelle length (L) varies azimuthally. The nacelle length (L) decreases azimuthally from an inboard end of the nacelle to an outboard end of the nacelle.

A nacelle for a gas turbine engine having a longitudinal centre line includes an intake lip disposed at an upstream end of the nacelle. The intake lip includes a crown and a keel. The crown includes a crown leading edge and the keel includes a keel leading edge. The crown leading edge and the keel leading edge define a scarf line therebetween. The scarf line forms a scarf angle (&#x3b8;) relative to a reference line perpendicular to the longitudinal centre line. A fan casing is disposed downstream of the intake lip and includes a casing leading edge. The casing leading edge defines a droop line normal to the casing leading edge. The droop line forms a droop angle (&#x3b8;) relative to the longitudinal centre line. A relationship between the droop angle (&#x3b8;) and the scarf angle (&#x3b8;) is given by: &#x3b8;=&#x3b8;/1.5&#xb1;1 degree.

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Bedford, United Kingdom

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