# US 2019/0170003 A1 · Modulation of vane end serrations

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- Number: US 2019/0170003 A1
- Document ID: US20190170003A1
- Status: Published application
- Kind: A1
- Application number: 16/174,553
- Filed: 2018-10-30
- Published: 2019-06-06
- Earliest claimed: 2017-10-30
- Assignees: Safran Aircraft Engines
- Applicants: Safran Aircraft Engines
- Inventors: Claire Marie FIGEUREU; Eric Pierre Georges LEMARECHAL; Benjamin BULOT; Mathieu Simon Paul GRUBER; Raphael BARRIER; Cyril POLACSEK
- Web page: https://patentgrep.com/patent/US20190170003A1

## CPC

- F01D 9/041: {using blades (F01D5/148 takes precedence)}
- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F04D 29/544: {Blade shapes}
- F04D 29/667: {by influencing the flow pattern, e.g. suppression of turbulence}
- F04D 29/681: {especially adapted for elastic fluid pumps}
- F01D 5/148: {Blades with variable camber, e.g. by ejection of fluid}
- F01D 5/282: {Selecting composite materials, e.g. blades with reinforcing filaments}
- F01D 25/162: {Bearing supports}
- F05D 2200/221: Square power
- F05D 2200/24: exponential
- F05D 2200/26: trigonometric
- F05D 2220/36: specially adapted for the fan of turbofan engines
- F05D 2240/121: related to the leading edge of a stator vane
- F05D 2250/182: crenellated, notched
- F05D 2250/183: zigzag
- F05D 2250/184: sinusoidal
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A stator vane including a vane root, a vane tip, a leading edge extending between the root and the tip, the leading edge having a serrated profile having a succession of teeth and of troughs each having an amplitude and a thickness, wherein a series of at least three teeth and three consecutive troughs starting from the vane root and/or from the vane tip have a growing amplitude and/or thickness.

## Claims

### Claim 1

A stator vane comprising:
a vane root,
a vane tip,
a leading edge extending between the root and the tip, the leading edge having a serrated profile having a succession of teeth and of troughs each having an amplitude and a thickness,
wherein a series of at least three teeth and three consecutive troughs starting from the vane root and/or from the vane tip have a growing amplitude and/or thickness.

### Claim 2 (depends on 1)

The vane according to claim 1, wherein the series comprises at least four teeth and four troughs or extends between 20 and 50% of the length of the vane.

### Claim 3 (depends on 1)

The vane according to claim 1, wherein the serrated profile is sinusoidal and wherein, within the series the amplitude and/or the thickness of the teeth and of the troughs is combined with a linear, parabolic, sinusoidal or exponential function.

### Claim 4 (depends on 1)

The vane according to claim 1, wherein the serrated profile is expressed in the following form:
c(r)=c0+h·sin(2πr/λ)
wherein c0 is the reference chord, h the amplitude and λ the wavelength of the undulations and r the radius
and wherein, within the series, the amplitude and/or the thickness of the teeth and of the troughs is combined with a linear function so that the profile is expressed within said series: c(r)=c0+h·sin(2πr/λ)·K·r
where K is a constant,
or
a parabolic function so that the profile is expressed within said series:
c(r)=c0+h·sin(2πr/λ)·L·r2 where L is a constant,
or
a sinusoidal function so that the profile is expressed within said series:
c(r)=c0+h·sin(2πr/λ)/sin(Mπ/2·r) where M is a constant,
or
an exponential function so that the profile is expressed within said series:
c(r)=c0+h·sin(2πr/λ)·exp(N·r) where N is a constant.

### Claim 5 (depends on 1)

The vane according to claim 1, wherein the vane is made of composite material.

### Claim 6 (depends on 1)

The vane according to claim 1, wherein the amplitude of the first trough or of the first tooth from the tip or from the root of the vane is nonzero.

### Claim 7 (depends on 1)

A straightener ring comprising a plurality of vanes according to claim 1, the vanes being distributed circumferentially around a hub.

### Claim 8 (depends on 1)

A turbomachine or test bed comprising a vane according to claim 1.