公开(公告)号：US20170175767A1

公开(公告)日：2017-06-22

申请号：US14974138

申请日：2015-12-18

Applicant: United Technologies Corporation

Inventor： Frederick M. Schwarz ,  David A. Welch

IPC: F04D29/52 ,  F04D29/66 ,  F02K3/06 ,  F02C3/04 ,  F02C7/36 ,  F04D19/00 ,  F04D25/02

Abstract: A gas turbine engine comprises a fan rotor having fan blades received within an outer nacelle, and the outer nacelle having an inner surface. At least a portion of the nacelle inner surface extends radially inwardly to be radially inward of an outer diameter of the fan blades. The inner surface of the nacelle is formed with a trench, which extends into the inner surface to a radially outer extent that is spaced radially outward of the outer diameter of the fan blades.