公开(公告)号：US20180372323A1

公开(公告)日：2018-12-27

申请号：US16012436

申请日：2018-06-19

Applicant: ROLLS-ROYCE PLC

Inventor： Michael GRIFFITHS

IPC: F23R3/34 ,  F23R3/28 ,  F23K5/14 ,  F23K5/06 ,  F02C9/34 ,  F02C7/22 ,  F02C7/228 ,  F02C7/232 ,  F02C9/26 ,  F02C7/14

Abstract: A combustion staging system is provided for fuel injectors of a multi-stage combustor of a gas turbine engine. The system has a splitting unit which receives a metered total fuel flow and controllably splits the metered total fuel flow into out-going pilot and mains fuel flows to perform pilot-only and pilot-and-mains staging control of the combustor. The system further has pilot and mains fuel manifolds which respectively receive the pilot and mains fuel flows. The system further has a plurality of mains flow scheduling valves which distribute the mains fuel flow from the mains fuel manifold to mains discharge orifices of respective injectors of the combustor. The system further has servo line which extends to the mains flow scheduling valves, the servo line being controllably fillable with pressurised fuel to change the pressure in the servo line relative to the pressure in the mains fuel manifold. Each mains flow scheduling valve has a chamber containing a movable piston, the chamber to a mains side of the piston being fed by the mains fuel manifold, and the chamber to a servo side of the piston being fed by the servo line. The piston has an open pilot-and-mains position which allows flow out of the mains side of the chamber to the mains discharge orifice of the respective injector. The piston is biased towards a closed pilot-only position which prevents flow out of the mains side of the chamber to the mains discharge orifice of the respective injector. The piston is movable to the closed position under an increase in pressure in the servo line relative to the mains fuel manifold.

公开(公告)号：US20180163636A1

公开(公告)日：2018-06-14

申请号：US15821243

申请日：2017-11-22

Applicant: ROLLS-ROYCE plc

Inventor： Michael GRIFFITHS

IPC: F02C9/26 ,  F23R3/34 ,  F02C7/232 ,  F02C7/22

CPC classification number: F02C9/263 ,  F02C7/22 ,  F02C7/222 ,  F02C7/232 ,  F02C7/236 ,  F02C9/34 ,  F05D2220/32 ,  F05D2240/35 ,  F23K5/06 ,  F23R3/34 ,  F23R3/343 ,  F23R3/346 ,  Y02T50/671

Abstract: The fuel supply system includes mains pressurising and metering arrangement including a positive displacement ecology pump and an ecology valve piston chamber and a piston slidably movable in the chamber between de-prime and re-prime positions, the chamber forming a fuel sink to one side of the piston which increases in volume when the piston moves to de-prime position and reduces in volume when the piston moves to re-prime position. The ecology valve is fluidly connected to the ecology pump for pilot-only operation reverse direction operation of the ecology pump causes the piston to move to de-prime position removing mains fuel from injectors through a mains fuel distribution pipework and into the fuel sink, and for pilot and mains operation the forward direction operation of the ecology pump causes the piston to move to re-prime position refilling injectors with mains fuel from the fuel sink.

公开(公告)号：US20210018177A1

公开(公告)日：2021-01-21

申请号：US16916589

申请日：2020-06-30

Applicant: ROLLS-ROYCE plc

Inventor： Michael GRIFFITHS ,  Daniel J. BICKLEY

IPC: F23R3/34 ,  F02C7/36 ,  F02C7/228 ,  F02C7/232 ,  F02C9/26

Abstract: A combustion staging system for fuel injectors of a multi-stage combustor of a gas turbine engine. The system includes plural fuel injectors, each having respective pilot and mains injection stages. It further includes a splitting unit which, to perform staging control of the combustor, receives a metered fuel flow and, for pilot and mains operation, controllably splits the received fuel flow into a pilot flow for injecting at the pilot stages of the injectors and a mains flow for injecting at the mains stages of the injectors, and for pilot-only operation, controllably splits the received fuel flow into a first part of the pilot flow for injecting at the pilot stages of a first portion of the injectors and a second part of the pilot flow for injecting at the pilot stages of a second portion of the injectors.