Flutter-resistant blade
AssigneeROLLS-ROYCE plc
InventorBharat M. LAD
Life of this patent
Estimating the term…
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.
Claims13
An aircraft engine having a fan, the fan comprising a plurality of blades, each 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, for a first set of blades within the plurality of blades, at every point along the radial extent of each blade of the first set of blades, each blade of the first set of blades has a modeshape value V1 for a blade first vibratory mode defined as:
- V
- 1
- =
-
- D
- 1
-
- LE
-
-
- D
- 1
-
- MC
-
- wherein, when the engine is operating between its maximum speed and 70% of that maximum speed, at least 80% of the radial extent of each blade of the first set of blades has a modeshape value V1 from 0 to 1.5.
Dependencies are inferred from the claim text.