公开(公告)号：US11780597B2

公开(公告)日：2023-10-10

申请号：US17853332

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: F02C9/26 ,  F02C7/22 ,  B64D27/10 ,  B64D37/04 ,  B64D41/00

CPC classification number: B64D27/10 ,  B64D37/04 ,  B64D41/00 ,  F02C7/22 ,  F02C9/26

Abstract: A propulsion system for an aircraft comprises a gas turbine engine; a plurality of fuel tanks arranged to contain different fuels to be used to power the gas turbine engine, wherein the fuels have different calorific values; and a fuel manager. The fuel manager is arranged to store information on the fuel contained in each fuel tank and to control fuel input to the gas turbine engine in operation by selection of a specific fuel or fuel combination from one or more of the plurality of fuel tanks based on thrust demand of the gas turbine engine such that a fuel with a lower calorific value is supplied to the gas turbine engine at lower thrust demand.

公开(公告)号：US11708769B2

公开(公告)日：2023-07-25

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: F02C9/00 ,  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.

公开(公告)号：US11643979B1

公开(公告)日：2023-05-09

申请号：US17853185

申请日：2022-06-29

Applicant: ROLLS-ROYCE plc

Inventor： Craig W Bemment ,  Benjamin J Keeler ,  Paul W Ferra ,  Alastair G Hobday ,  Kevin R McNally ,  Andrea Minelli ,  Martin K Yates

IPC: F02C9/28 ,  B64D41/00 ,  B64D37/00 ,  B64D27/12

CPC classification number: F02C9/28 ,  B64D27/12 ,  B64D37/00 ,  B64D41/00 ,  F05D2220/323 ,  F05D2240/35 ,  F05D2270/313

Abstract: A propulsion system for an aircraft includes a gas turbine engine and a fuel tank, wherein the fuel includes at least a proportion of a sustainable aviation fuel—SAF—having a density between 90% and 98% of the density, ρK, of kerosene and a calorific value between 101% and 105% the calorific value CVK, of kerosene. The engine includes a combustor; and a fuel pump arranged to supply a fuel thereto at an energy flow rate, C, the pump being arranged to output fuel at a volumetric flow rate, Q, the percentage of fuel passing through the pump not provided to the combustor being referred to as a spill percentage. The fuel include X % SAF, where X % is in the range from 5% to 100%, and has a density, ρF, and a calorific value CVF. The propulsion system is arranged so:



the fuel-change spill ratio, Rs, of:









R
s

=


spill
⁢

percentage
⁢

at
⁢

cruise
⁢

using
⁢

kerosene


spill
⁢

percentage
⁢

at
⁢

cruise
⁢

using
⁢

the
⁢

fuel
⁢

with
⁢

X
⁢

%
⁢

S
⁢
A
⁢
F








is equal to:










Q
-

(

C
/

(


CV
K

×

ρ
K


)


)



Q
-

(

C
/

(


CV
F

×

ρ
F


)


)



.

公开(公告)号：US11585282B1

公开(公告)日：2023-02-21

申请号：US17853291

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: F02C9/40 ,  F02C9/28 ,  F01D21/00

Abstract: A method of identifying a fuel contained in a fuel tank of an aircraft and arranged to power a gas turbine engine of the aircraft is performed by processing circuitry of the aircraft and includes: obtaining at least one fuel characteristic of any fuel already present in the fuel tank prior to refuelling; determining at least one fuel characteristic of a fuel added to the fuel tank on refuelling; and calculating at least one fuel characteristic of the resultant fuel in the fuel tank after refuelling. The method may further controlling the propulsion system of the aircraft based on the calculated at least one fuel characteristic of the resultant fuel in the fuel tank after refuelling.