Combustion equipment

Patent metadata

Field	Value
Publication number	US-2016290225-A1
Application number	US-201615061150-A
Country	US
Kind code	A1
Filing date	Mar 4, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Combustion equipment includes annular combustion chamber having an annular upstream wall structure. Annular outer casing surrounds and is spaced from annular combustion chamber and annular inner casing is within and spaced from annular combustion chamber. Ogee shaped annular cowl is positioned upstream of annular upstream wall structure and a stage of compressor outlet guide vanes is positioned upstream of annular cowl. Pre-diffuser extends in downstream direction from stage of compressor outlet guide vanes, pre-diffuser is positioned upstream of cowl. Stage of compressor outlet guide vanes is connected to outer and inner casing. Outer fairing extends radially inwardly from outer casing such that annular outer casing, outer fairing and pre-diffuser define annular outer cavity and outer fairing is spaced from cowl or inner fairing extends radially outwardly from inner casing such that annular inner casing, inner fairing and pre-diffuser define an annular inner cavity and inner fairing is spaced from cowl.

First claim

1 . Combustion equipment comprising an annular combustion chamber having an annular upstream wall structure, an annular outer casing surrounding and spaced from the annular combustion chamber, an annular inner casing within and spaced from the annular combustion chamber,
an annular cowl being positioned upstream of the annular upstream wall structure, the annular cowl having an upstream end and a downstream end, a stage of compressor outlet guide vanes positioned upstream of the annular cowl, a pre-diffuser extending in a downstream direction from the stage of compressor outlet guide vanes, the pre-diffuser being positioned upstream of the cowl, the stage of compressor outlet guide vanes being connected to the outer casing and the inner casing, an outer fairing extending radially inwardly from the outer casing such that the annular outer casing, the outer fairing and the pre-diffuser define an annular outer cavity and the outer fairing being spaced from the cowl, an inner fairing extending radially outwardly from the inner casing such that the annular inner casing, the inner fairing and the pre-diffuser define an annular inner cavity and the inner fairing being spaced from the cowl, and the annular cowl being ogee in cross-sectional profile and the apex of the cowl being arranged at the upstream end of the cowl.

2 . Combustion equipment arrangement as claimed in claim 1 wherein the outer fairing comprising a first portion extending from the outer casing from a position at or downstream of the downstream end of the cowl radially inwardly and in an upstream direction to a position upstream of the downstream end of the cowl and a second portion extending from the first portion radially outwardly to the outer casing.

3 . Combustion equipment arrangement as claimed in claim 2 wherein the first portion of the outer fairing extending to a position at or downstream of the upstream end of the cowl.

4 . Combustion equipment arrangement as claimed in claim 2 wherein the first portion of the outer fairing extending to a position upstream of the downstream end of the cowl.

5 . Combustion equipment arrangement as claimed in claim 2 wherein the first portion of the outer fairing being straight or arcuate.

6 . Combustion equipment arrangement as claimed in claim 2 wherein the first and the second portions of the outer fairing and the outer casing form a triangle.

7 . Combustion equipment arrangement as claimed in claim 1 wherein the inner fairing comprising a first portion extending from the inner casing from a position at or downstream of the downstream end of the cowl radially outwardly and in an upstream direction to a position upstream of the downstream end of the cowl and a second portion extending from the first portion to the inner casing.

8 . Combustion equipment arrangement as claimed in claim 7 wherein the first portion of the inner fairing extending to a position downstream of the upstream end of the cowl.

9 . Combustion equipment arrangement as claimed in claim 7 wherein the first portion of the inner fairing extending to a position upstream of the downstream end of the cowl.

10 . Combustion equipment arrangement as claimed in claim 7 wherein the first portion of the inner fairing being straight or arcuate.

11 . Combustion equipment arrangement as claimed in claim 7 wherein the first and second portions of the inner fairing and the inner casing form a triangle.

12 . Combustion equipment arrangement as claimed in claim 1 wherein the apex of the cowl being arcuate.

13 . Combustion equipment arrangement as claimed in claim 1 wherein the pre-diffuser comprising an inner annular wall and an outer annular wall defining an annular passage, the inner annular wall and the outer annular wall being arcuate in cross-section such that the annular passage having a greater cross-sectional area at its downstream end than its upstream end.

14 . Combustion equipment arrangement as claimed in claim 13 wherein the inner annular wall and the outer annular wall being cubic curves.

15 . Combustion equipment as claimed in claim 2 wherein the annular outer cavity being defined by the pre-diffuser, the outer casing, the second portion of the outer fairing and an annular wall extending from the outer casing to the stage of compressor outlet guide vanes.

16 . Combustion equipment as claimed in claim 7 wherein the annular inner cavity being defined by the pre-diffuser, the inner casing and the second portion of the inner fairing.

17 . Combustion equipment as claimed in claim 2 wherein the second portion of the outer fairing being positioned downstream of the downstream end of the pre-diffuser.

18 . Combustion equipment as claimed in claim 7 wherein the second portion of the inner fairing being positioned downstream of the downstream end of the pre-diffuser.

19 . Combustion equipment as claimed in claim 1 wherein the outer fairing comprising a first portion extending from the outer casing from a position at or downstream of the downstream end of the cowl radially inwardly and in an upstream direction to a position upstream of the downstream end of the cowl and a second portion extending from the first portion radially outwardly to the outer casing, the inner fairing comprising a first portion extending from the inner casing from a position at or downstream of the downstream end of the cowl radially outwardly and in an upstream direction to a position upstream of the downstream end of the cowl and a second portion extending from the first portion to the inner casing, an inlet to the annular outer cavity being defined between the downstream end of the pre-diffuser and a junction between the first and second portions of the outer fairing and an inlet to the annular inner cavity being defined between the downstream end of the pre-diffuser and a junction between the first and second portions of the inner fairing.

20 . Combustion equipment comprising an annular combustion chamber having an annular upstream wall structure, an annular outer casing surrounding and spaced from the annular combustion chamber, an annular inner casing within and spaced from the annular combustion chamber,
an annular cowl being positioned upstream of the annular upstream wall structure, the annular cowl having an upstream end and a downstream end, a stage of compressor outlet guide vanes positioned upstream of the annular cowl, a pre-diffuser extending in a downstream direction from the stage of compressor outlet guide vanes, the pre-diffuser being positioned upstream of the cowl, the stage of compressor outlet guide vanes being connected to the outer casing and the inner casing, an outer fairing extending radially inwardly from the outer casing such that the annular outer casing, the outer fairing and the pre-diffuser define an annular outer cavity and the outer fairing being spaced from the cowl, the outer fairing comprising a first portion extending from the outer casing radially inwardly and in an upstream direction to a position upstream of the downstream end of the cowl and a second portion extending from the first portion radially outwardly to the outer casing, the first portion of the outer fairing extending to a position at or downstream of the upstream end of the cowl, an inner fairing extending radially outwardly from the inner casing such that the annular inner casing, the inner fairing and the pre-diffuser define an annular inner cavity and the inner fairing being spaced from the cowl, the inner fairing comprising a first portion extend

Assignees

• Rolls Royce Plc

Inventors

• Armit Christopher
• Aurifeille Emmanuel
• Shahpar Shahrokh
• Denman Paul
• Ford Christopher

Classifications

• F02C3/04 Primary

  having a turbine driving a compressor (power transmission arrangements F02C7/36; control of working fluid flow F02C9/16) · CPC title

• F23R3/002

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title

• F23R3/10 Primary

  for primary air (F23R3/06, F23R3/045 take precedence) · CPC title

• F23R3/26

  Controlling the air flow · CPC title