公开(公告)号：US10392971B2

公开(公告)日：2019-08-27

申请号：US15361234

申请日：2016-11-25

Applicant: ROLLS-ROYCE, PLC

Inventor： Angus R Smith ,  Christopher T Sheaf ,  David G MacManus ,  Robert E Christie

IPC: F01D25/24 ,  F01D9/02 ,  B64D33/02 ,  F04D29/52 ,  F02C7/04 ,  F01D25/04 ,  F04D29/66

Abstract: A nacelle for a turbofan gas turbine engine, having in flow series an intake lip, a diffuser and a fan casing. The diffuser has, in flow series, a main section and a recessed section adjacent to the fan casing. A transition region, such as a step, slope or curve, is provided between the main section and the recessed section. In some arrangements the transition region may be configured to promote flow separation and the formation of a separation bubble in the recessed section.