公开(公告)号：US20220090502A1

公开(公告)日：2022-03-24

申请号：US17464047

申请日：2021-09-01

Applicant: ROLLS-ROYCE plc

Inventor： Bharat M. LAD

IPC: F01D5/14

Abstract: An aircraft engine having a turbine, the turbine having at least one flutter-resistant blade, the blade having a leading edge (LE), a trailing edge (TE), a midchord (MC), a minimum radial height rhub, a maximum radial height rtip, and a radial extent between rhub and rtip, wherein, at every point along the radial extent of the blade, the blade has a modeshape value V1 for a blade first vibratory mode defined as V 1 =  D 1 ⁢ LE   D 1 ⁢ MC  , and wherein, when the engine is operating between its maximum speed and 70% of that maximum speed, at least 80% of the radial extent of the blade has a modeshape value V1 from 0 to 1.5.

公开(公告)号：US20220090503A1

公开(公告)日：2022-03-24

申请号：US17464035

申请日：2021-09-01

Applicant: ROLLS-ROYCE plc

Inventor： Bharat M. LAD

IPC: F01D5/16

Abstract: An aircraft engine having a fan, the fan having at least one flutter-resistant blade, the blade having a leading edge (LE), a trailing edge (TE), a midchord (MC), a minimum radial height rhub, a maximum radial height rtip, and a radial extent between rhub and rtip, wherein, at every point along the radial extent of the blade, the blade has a modeshape value V1 for a blade first vibratory mode defined as V 1 =  D 1 ⁢ LE   D 1 ⁢ MC  , and wherein, when the engine is operating between its maximum speed and 70% of that maximum speed, at least 80% of the radial extent of the blade has a modeshape value V1 from 0 to 1.5.

公开(公告)号：US20220090605A1

公开(公告)日：2022-03-24

申请号：US17464041

申请日：2021-09-01

Applicant: ROLLS-ROYCE plc

Inventor： Bharat M. LAD

IPC: F04D29/38 ,  F02C3/00

Abstract: An aircraft engine having a compressor, the compressor having at least one flutter-resistant blade, the blade having a leading edge (LE), a trailing edge (TE), a midchord (MC), a minimum radial height rhub, a maximum radial height rtip, and a radial extent between rhub and rtip, wherein, at every point along the radial extent of the blade, the blade has a modeshape value V1 for a blade first vibratory mode defined as V 1 =  D 1 ⁢ LE   D 1 ⁢ MC  , and wherein, when the engine is operating between its maximum speed and 70% of that maximum speed, at least 80% of the radial extent of the blade has a modeshape value V1 from 0 to 1.5.

公开(公告)号：US20200149421A1

公开(公告)日：2020-05-14

申请号：US16654450

申请日：2019-10-16

Applicant: ROLLS-ROYCE plc

Inventor： Bharat M. LAD

IPC: F01D5/30

Abstract: A bladed disc comprising a disc hub 110; a set of blades 120 angularly distributed around the disc hub; wherein there is variation in a geometric parameter between the blades. The blades are positioned around the disc hub such that for a majority of pairs of neighbouring blades in the set, an interval between values of the geometric parameter between the blades of the pair is less than 0.5 standard deviations of the geometric parameter for the set of blades.