公开(公告)号：US20180195727A1

公开(公告)日：2018-07-12

申请号：US15862745

申请日：2018-01-05

Applicant: ROLLS-ROYCE plc

Inventor： Frederic Witham ,  Steven Ballantyne ,  Jonathan M. Gregory ,  Mike OJ Caruso

IPC: F23R3/28 ,  F23R3/38 ,  F23R3/34 ,  F23R3/20 ,  F23R3/14 ,  F02C7/22 ,  F23D11/38 ,  F23D11/10 ,  F02C9/28

CPC classification number: F23R3/286 ,  F02C7/222 ,  F02C9/28 ,  F23D11/107 ,  F23D11/38 ,  F23D11/383 ,  F23D2900/11101 ,  F23R3/14 ,  F23R3/20 ,  F23R3/28 ,  F23R3/343 ,  F23R3/38 ,  F23R2900/00004

Abstract: A fuel injector comprises an elongate fuel passage (38) having an elongate axis extending from an upstream inlet end to a downstream outlet end. One or more outlets (38a) at an end of the passage extend obliquely with respect to the elongate axis. The elongate fuel passage is defined by an inner skin (35a) of a double skinned pipe, the double skinned pipe defining a first annular cavity (39) between the inner skin (35a) and outer skin (35). The inner skin (35a) and the outer skin (35) meet adjacent the one or more outlets (38a) to close an end of the first annular cavity (39). A second annular cavity (40) is defined by an annular outer wall (40a) extending from downstream of the passage end to a position downstream of the one or more outlets (38a). The fuel passage outlets (38a) emerge at a radially outer surface of the annular outer wall (40a). The annular outer wall (40a) is convergent at a downstream end whereby to define an orifice (40b) centred nominally coincident with the elongate axis. The annular outer wall (40a) may form part of an annular air swirler arranged nominally concentrically on the elongate axis.