公开(公告)号：US20200256202A1

公开(公告)日：2020-08-13

申请号：US16748833

申请日：2020-01-22

Applicant: ROLLS-ROYCE plc

Inventor： Ronald A. BATES ,  Karl S. HUCKERBY ,  Toland WALKER

IPC: F01D5/30

Abstract: There is disclosed a blade for a gas turbine engine comprising a blade root that is elongate in a longitudinal direction. The blade root comprises a first flank surface and a second flank surface on opposite sides of the blade root that are asymmetrical about a longitudinal mid-plane of the blade root.

公开(公告)号：US10738693B2

公开(公告)日：2020-08-11

申请号：US16398760

申请日：2019-04-30

Applicant: ROLLS-ROYCE PLC

Inventor： Michael J Whittle ,  Pascal Dunning ,  Roderick M Townes

IPC: F02C3/06 ,  F02C7/36 ,  F02K3/06 ,  F01D5/28

Abstract: A highly efficient gas turbine engine includes a fan which is driven from a turbine via a gearbox, such that the fan has a lower rotational speed than the driving turbine, thereby providing efficiency gains. The efficient fan system is mated to a core that has low cooling flow requirements and/or high temperature capability, and which may have particularly low mass for a given power.

公开(公告)号：US10738625B2

公开(公告)日：2020-08-11

申请号：US15878785

申请日：2018-01-24

Applicant: ROLLS-ROYCE plc

Inventor： John H. Boswell ,  Andrew R. Walpole

IPC: F01D5/30 ,  B23K20/12 ,  F01D5/02 ,  B23K20/02 ,  B23P15/04 ,  F01D5/34 ,  F01D5/12

Abstract: A method (56) for fabricating an integral assembly (24) is disclosed. The method comprises providing (56) a first workpiece (26) having a first surface (46) and a second workpiece (28) having a second surface (50), performing a first bonding process between the first surface (46) of the first workpiece (26) and the second surface (50) of the second workpiece (28) to form a sub-assembly workpiece (48), and performing a second bonding process between a third surface (52) of the sub-assembly workpiece (48) and a fourth surface (54) of a third workpiece (30) to form the integral assembly (24). The material properties of the first workpiece (26) are different from material properties of the third workpiece (30).

公开(公告)号：US20200248633A1

公开(公告)日：2020-08-06

申请号：US16740724

申请日：2020-01-13

Applicant: ROLLS-ROYCE plc

Inventor： Stephen G. DENNISON

IPC: F02C9/00

Abstract: A combustor for a gas turbine engine comprising: a combustion chamber; at least one fuel spray nozzle operable to deliver a fuel-air mixture into the combustion chamber, wherein during operation of the gas turbine engine the fuel-air mixture is combusted in the combustion chamber, thereby producing a combustion flame; a microwave generator coupled to a waveguide arranged to guide microwaves from the microwave generator into the combustion chamber such that the microwaves are incident on at least a portion of the combustion flame; and a detector operable to detect at least a portion of the microwaves reflected by the combustion flame and/or atomised fuel droplets.

公开(公告)号：US20200248631A1

公开(公告)日：2020-08-06

申请号：US16750376

申请日：2020-01-23

Applicant: ROLLS-ROYCE plc

Inventor： David L ALLEN

IPC: F02C7/36 ,  F02C7/32

Abstract: A gearbox assembly comprising: a gearbox having a plurality of gears, an air turbine starter, and a transfer shaft. The transfer shaft has a first end portion engaged with a gear of the gearbox and an opposing second end portion configured for operative connection with a core shaft of the turbine engine. The air turbine starter is operatively engaged with the transfer shaft between the first and second end portions so as to be rotatable by the air turbine starter.

公开(公告)号：US20200248581A1

公开(公告)日：2020-08-06

申请号：US16749109

申请日：2020-01-22

Applicant: ROLLS-ROYCE plc

Inventor： Gareth L. JONES ,  Daniel J. WILLIAMS ,  Natalie C. WONG

IPC: F01D21/02 ,  F02K3/10

Abstract: A method is provided of controlling a gas turbine having a shaft connecting a compressor to a turbine, as well as having a reheat system, and a gas turbine. The method includes the steps of: operating the engine using the reheat system to provide a mass flow rate of reheat fuel into a gas flow of the gas turbine engine downstream of an exit of the turbine; detecting a shaft break event in the shaft; and in response to this detection, maintaining the mass flow rate of the reheat fuel being provided into the gas flow downstream of the turbine exit, whereby the maintained mass flow rate of reheat fuel raises a back pressure downstream of the turbine and thereby reduces a rotational speed of the turbine.

公开(公告)号：US20200248335A1

公开(公告)日：2020-08-06

申请号：US16741870

申请日：2020-01-14

Applicant: ROLLS-ROYCE plc ,  ROLLS-ROYCE DEUTSCHLAND LTD & CO KG

Inventor： Felix BIERNOT ,  Toma D. NIKOLOV ,  Priyesh R. PATEL ,  Justin P M TSANG

IPC: C30B33/02 ,  C22F1/00

Abstract: An insert fixture has a base, a plurality of mounting brackets, and a plurality of separators. The plurality of separators extends vertically from the base and includes a plurality of grid portions extending the length of the insert fixture and a plurality of divider portions, which connect to the plurality of grid portions to form a plurality of individual component holders around one of the plurality of mounting brackets. Each individual component holder has two separated grid portion sections positioned on either side of the bracket. These grid portions have two divider portions which are also separated and positioned either side of the bracket at an angle relative to the two grid portions. The individual component holder forms a cell around the mounting bracket. The insert fixture may be constructed from a molybdenum alloy, lanthanum oxide and/or titanium zirconium molybdenum.

公开(公告)号：US20200244181A1

公开(公告)日：2020-07-30

申请号：US16747760

申请日：2020-01-21

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Zhigang SUN ,  Ellis FH CHONG

IPC: H02M7/219 ,  H02P9/30 ,  F02C6/00

Abstract: Disclosed herein is a converter for converting an AC voltage to a DC voltage, the converter comprising: a first H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; a second H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; an isolation block arranged between the second AC terminal of the first H-bridge circuit and the second AC terminal of the second H-bridge circuit; and a DC voltage output of the converter with a first terminal and a second terminal; wherein: the first terminal of the DC voltage output is connected to the first DC terminal of the first H-bridge circuit and the first DC terminal of the second H-bridge circuit; and the second terminal of the DC voltage output is connected to the second DC terminal of the first H-bridge circuit and the second DC terminal of the second H-bridge circuit.

公开(公告)号：US20200240422A1

公开(公告)日：2020-07-30

申请号：US16742074

申请日：2020-01-14

Applicant: ROLLS-ROYCE plc

Inventor： Ralph W. HILL

IPC: F04D27/00 ,  F02C7/36 ,  G01D5/02

Abstract: A monitoring system for monitoring behaviour of a rotating shaft is provided. The system includes a phonic wheel which is mounted coaxially to the shaft for rotation therewith, the phonic wheel having a number N of teeth in a circumferential row. The system further includes a first sensor configured to detect the passage of the teeth of the phonic wheel by generating a first alternating measurement signal which includes (i) a primary oscillatory component having a frequency of fN, where f is the rotational frequency of the shaft, and (ii) a secondary oscillatory component of frequency f when the phonic wheel precesses such that each revolution of the shaft a clearance between the phonic wheel and the first sensor cyclically varies between a maximum value and a minimum value. The system further includes a processor unit configured to determine the durations of successive first speed samples, each first speed sample being a block of integer n successive cycles of the primary oscillatory component of the first alternating measurement signal. The secondary oscillatory component of the first alternating measurement signal, when present, produces a cyclical variation of frequency fin the durations of the successive first speed samples. The processor unit is further configured to detect any such cyclical variation of the first speed samples and to compare a detected cyclical variation of the first speed samples against a threshold variation to determine therefrom if the phonic wheel is precessing.

公开(公告)号：US20200240286A1

公开(公告)日：2020-07-30

申请号：US16747745

申请日：2020-01-21

Applicant: ROLLS-ROYCE plc

Inventor： Ralph W HILL

IPC: F01D21/00 ,  G01H1/00 ,  F01D21/06 ,  G01P3/46

Abstract: A monitoring system for monitoring one or more properties associated with a rotating shaft is provided. The system includes a first phonic wheel which is mounted coaxially to the shaft for rotation therewith, the first phonic wheel comprising a circumferential row of teeth. The system further includes a first sensor configured to detect the passage of the row of teeth of the first phonic wheel by generating a first alternating measurement signal. The system further includes a processor unit configured to determine the durations of successive first speed samples. Each first speed sample is a block of n successive cycles of the first alternating measurement signal, where n is an integer, and in which the beginning of each cycle is a zero-crossing point from the previous cycle and the end of each cycle is the corresponding zero-crossing point to the next cycle. At least one axial location of the first phonic wheel every mth tooth of the row of teeth of the first phonic wheel has a circumferential thickness which is different from that of the other teeth of the first phonic wheel, where m is an integer, m≠n, and m is neither a factor nor a multiple of n. When the first sensor is positioned at said axial location of the first phonic wheel and at any given rotational speed of the first phonic wheel, the durations of the successive first speed samples display a characteristic repeating pattern of longer and shorter sample durations relative to the average duration of the successive first speed samples. The amount by which the longer and shorter sample durations differ from the average duration is in proportion to the amount by which the circumferential thickness of the mth teeth differs from that of the other teeth at said axial location of the first phonic wheel. The processor unit monitors the properties associated with the rotating shaft from the characteristic repeating pattern.