Modulation of vane end serrations

Patent metadata

Field	Value
Publication number	US-2019170003-A1
Application number	US-201816174553-A
Country	US
Kind code	A1
Filing date	Oct 30, 2018
Priority date	Oct 30, 2017
Publication date	Jun 6, 2019
Grant date	—

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.

First 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.

2 . 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.

3 . 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.

4 . The vane according to claim 1 , wherein the serrated profile is expressed in the following form:
c ( r )= c 0 +h ·sin(2π r /λ)
wherein c 0 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)=c 0 +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 )= c 0 +h ·sin(2π r /λ)· L·r 2 where L is a constant,

or a sinusoidal function so that the profile is expressed within said series:
c ( r )= c 0 +h ·sin(2π r /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 )= c 0 +h ·sin(2π r /λ)·exp( N·r ) where N is a constant.

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

6 . 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.

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

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

Assignees

• Safran Aircraft Engines

Inventors

• Figeureu Claire Marie
• Lemarechal Eric Pierre Georges
• Bulot Benjamin
• Gruber Mathieu Simon Paul
• Barrier Raphael
• Polacsek Cyril

Classifications

• F05D2200/26

  trigonometric · CPC title

• F05D2250/184

  sinusoidal · CPC title

• F01D25/162

  Bearing supports · CPC title

• F01D5/282

  Selecting composite materials, e.g. blades with reinforcing filaments · CPC title

• F01D5/141

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title