公开(公告)号：US20230193835A1

公开(公告)日：2023-06-22

申请号：US17853074

申请日：2022-06-29

Applicant: ROLLS-ROYCE PLC

Inventor： Peter SWANN ,  Craig W. BEMMENT ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Christopher P. MADDEN

IPC: F02C9/28 ,  G08G5/00 ,  B64D27/10 ,  B64D37/04

CPC classification number: F02C9/28 ,  B64D27/10 ,  B64D37/04 ,  G08G5/0034

Abstract: A method of operating an aircraft including a gas turbine engine and a plurality of fuel tanks arranged to provide fuel to the gas turbine engine, where at least two of the fuel tanks contain fuels with different fuel characteristics. The method includes obtaining a flight profile for a flight of the aircraft; and determining a fuelling schedule for the flight based on the flight profile and the fuel characteristics. The fuelling schedule governs the variation with time of how much fuel is drawn from each tank. Fuel input to the gas turbine engine may then be controlled in operation in accordance with the fuelling schedule.

公开(公告)号：US20240318600A1

公开(公告)日：2024-09-26

申请号：US18677165

申请日：2024-05-29

Applicant: ROLLS-ROYCE plc

Inventor： Craig W. BEMMENT ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Christopher P. MADDEN ,  Andrea MINELLI ,  Andrew T. SMITH ,  Peter SWANN ,  Martin K. Yates

IPC: F02C7/224 ,  F02C9/28 ,  F23R3/28

CPC classification number: F02C7/224 ,  F02C9/28 ,  F23R3/28 ,  F05D2260/221

Abstract: A method of operating a gas turbine engine is disclosed, the gas turbine engine comprising a combustor arranged to combust a fuel; and a fuel management system arranged to provide the fuel to the combustor. The fuel management system comprises two fuel-oil heat exchangers through which oil and the fuel flow, the heat exchangers arranged to transfer heat to the fuel and comprising a primary fuel-oil heat exchanger and a secondary fuel-oil heat exchanger; and a fuel pump arranged to deliver the fuel to the combustor, wherein the fuel pump is located between the two heat exchangers. The method comprises controlling the fuel management system so as to transfer between 200 and 600 kJ/m3 of heat to the fuel from the oil in the primary fuel-oil heat exchanger at cruise conditions.

公开(公告)号：US20240309817A1

公开(公告)日：2024-09-19

申请号：US18676832

申请日：2024-05-29

Applicant: ROLLS-ROYCE PLC

Inventor： Craig W. BEMMENT ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Christopher P. MADDEN ,  Andrea MINELLI ,  Andrew T. SMITH ,  Peter SWANN ,  Martin K. YATES

IPC: F02C9/38 ,  F02C7/14 ,  F02C7/16 ,  F02C7/224

CPC classification number: F02C9/38 ,  F02C7/14 ,  F02C7/16 ,  F02C7/224 ,  F05D2260/213

Abstract: A method of operating a gas turbine engine including: a combustor arranged to combust a fuel; and a fuel management system arranged to provide the fuel to the combustor, wherein the fuel management system includes two fuel-oil heat exchangers through which oil and fuel flow, which are arranged to transfer heat between the oil and fuel and include primary and secondary fuel-oil heat exchangers; a fuel pump arranged to deliver the fuel to the combustor, wherein the fuel pump is located between the heat exchangers; and a recirculation valve located downstream of the primary heat exchanger, the recirculation valve arranged to allow a controlled amount of fuel which has passed through the primary heat exchanger to be returned to the inlet. The method includes selecting one or more fuels such that the calorific value of the fuel provided to the gas turbine engine is at least 43.5 MJ/kg.

公开(公告)号：US20240209785A1

公开(公告)日：2024-06-27

申请号：US18337497

申请日：2023-06-20

Applicant: ROLLS-ROYCE plc

Inventor： Craig W. BEMMENT ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Andrea MINELLI ,  Andrew T. SMITH ,  Martin K. YATES

IPC: F02C7/224 ,  F02C7/14 ,  F02C7/32 ,  F23R3/00

CPC classification number: F02C7/224 ,  F02C7/14 ,  F02C7/32 ,  F23R3/005 ,  F05D2260/20

Abstract: A method of operating a gas turbine engine having an engine core having a turbine, a compressor, a combustor arranged to combust a fuel, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core; a fan shaft; a gearbox that receives an input from the core shaft and outputs drive to the fan via the fan shaft; a heat exchange system having at least one fuel-oil heat exchanger arranged to transfer heat to the fuel; and a fuel pump arranged to deliver the fuel to the combustor, wherein the fuel pump is located downstream of the at least one fuel-oil heat exchanger. The method includes operating the gas turbine engine using a fuel having a lubricity of between 0.71 mm and 0.90 mm wear scar diameter (WSD) at 25° C.

公开(公告)号：US20230324319A1

公开(公告)日：2023-10-12

申请号：US17853184

申请日：2022-06-29

Applicant: ROLLS-ROYCE PLC

Inventor： Craig W. BEMMENT ,  Paul W. FERRA ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Kevin R. MCNALLY ,  Andrea MINELLI ,  Martin K. YATES

IPC: G01N25/22 ,  F02C7/22

CPC classification number: G01N25/22 ,  F02C7/22 ,  F05D2220/323

Abstract: A method of checking refuelling of an aircraft comprising a gas turbine engine and a fuel tank arranged to provide fuel to the gas turbine engine comprises: receiving an input of calorific value data for fuel provided to the aircraft on refuelling; independently determining at least one of: (i) the calorific value of fuel supplied to the gas turbine engine in use; and (ii) the calorific value of the fuel provided to the aircraft on refuelling; and providing an alert if the determined calorific value is inconsistent with the calorific value data input received

公开(公告)号：US20230193832A1

公开(公告)日：2023-06-22

申请号：US18099490

申请日：2023-01-20

Applicant: ROLLS-ROYCE PLC

Inventor： Peter SWANN ,  David M. BEAVEN ,  Craig W. BEMMENT ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Christopher P. MADDEN ,  Martin K. YATES

IPC: F02C9/00 ,  B64D47/00 ,  G01N21/3577 ,  B64D27/10 ,  G01N21/33 ,  G01N33/28 ,  G01N21/64

CPC classification number: F02C9/00 ,  B64D47/00 ,  G01N21/3577 ,  B64D27/10 ,  G01N21/33 ,  G01N33/287 ,  G01N21/64 ,  B64D37/00

Abstract: A method of generating a maintenance schedule for an aircraft including one or more gas turbine engines powered by an aviation fuel. The method includes: determining one or more fuel characteristics of the fuel; and generating a maintenance schedule according to the one or more fuel characteristics. Also disclosed is a method of maintaining an aircraft, a maintenance schedule generation system and an aircraft.

公开(公告)号：US20230193777A1

公开(公告)日：2023-06-22

申请号：US17853405

申请日：2022-06-29

Applicant: ROLLS-ROYCE plc

Inventor： Peter SWANN ,  David M. BEAVEN ,  Craig W. BEMMENT ,  Alastair G. HOBDAY ,  Benjamin J. KEELER ,  Christopher P. MADDEN ,  Martin K. YATES

IPC: F01D21/00 ,  F02C9/28

CPC classification number: F01D21/003 ,  F02C9/28 ,  F05D2220/323 ,  F05D2260/80 ,  F05D2270/0831 ,  F05D2270/708 ,  F05D2270/804

Abstract: The present application discloses a method of determining one or more fuel characteristics of an aviation fuel suitable for powering a gas turbine engine of an aircraft. The method comprises: determining, during use of the gas turbine engine, one or more exhaust content parameters by performing a sensor measurement on an exhaust of the gas turbine engine; and determining one or more fuel characteristics of the fuel based on the one or more exhaust parameters. Also disclosed is a fuel characteristic determination system, a method of operating an aircraft, and an aircraft.