GAS TURBINE ENGINE FOR AIRCRAFT ENGINE

• US 20150078908A1
• Filed: 08/03/2012
• Published: 03/19/2015
• Est. Priority Date: 08/04/2011
• Status: Active Grant

• Current Assignee: GE AVIO S.r.l. (GE Aerospace)
• Original Assignee: GE AVIO S.r.l. (GE Aerospace)
• Inventors: Calza, Paolo
• Granted Patent: US 9,810,082 B2
• Time in Patent Office: Days
• US Class Current: 416/223.A
• CPC Class Codes: F01D 25/06 for preventing blade vibration means on blade-carrying members or blades F01D5/00
• CPC Class Codes: F01D 5/14 Form or construction selecting particular materials, measures against erosion or corrosion F01D5/28
• CPC Class Codes: F01D 9/04 forming ring or sector
• CPC Class Codes: F01D 9/041 using blades F01D5/148 takes precedence
• CPC Class Codes: F05D 2240/12 Fluid guiding means, e.g. vanes
• CPC Class Codes: F05D 2240/129 Cascades, i.e. assemblies of similar profiles acting in parallel
• CPC Class Codes: F05D 2260/96 Preventing, counteracting or reducing vibration or noise
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A gas turbine stator for aircraft engines has a blade array with a plurality of blades constituted by a series of first blades and a series of second blades with different geometries; the array is formed by a plurality of sectors, each having an inner portion, an outer portion, at least one first blade and a least one second blade, and each defined by a body made in one piece; a single first blade is alternated with a single second blade for the entire circumference of the stator.

Claims

1. ) A gas turbine stator (1) for aircraft engines, the stator comprising a blade array (1b) comprising a plurality of blades constituted by a series of first blades (5a) and a series of second blades (5b), said first blades (5a) having a different geometry from said second blades (5b);

characterized in that;

a) said first and second blades are arranged so as to alternate a single first blade (5a) with a single second blade (5b) for the entire circumference of the stator (1);

b) said blade array is defined by a plurality of sectors (2;

13;

14), each comprising;

i) an inner curved portion (3) next to the inner curved portions of adjacent sectors so as to form an inner annular end-wall (3a);

ii) an outer curved portion (4) next to the outer curved portions of adjacent sectors so as to form an outer annular end-wall (4a);

iii) at least one of said first blades (5a) and at least one of said second blades (5b);

c) each said sector (2;

13;

14) is defined by a body made in one piece.

2. ) A stator according to claim 1, characterized in that said first and second blades (5a and 5b) have resoective first and second radial generatrices, which are different from each other.

3. ) A stator according to claim 2, characterized in that said first and second generatrices comprise at least a first curved segment and, respectively, at least a second curved segment;

the first and second curved segments having different curvatures from each other.

4. ) A stator according to claim 3, characterized in that said first and second curved segments are intermediate segments.

5. ) A stator according to claim 4, characterized in that said first and second generatrices further comprise first and, respectively, second substantially straight segments, arranged on opposite ends of the respective said curved segment.

6. ) A stator according to claim 5, characterized in that said first and second straight segments extend from said inner and outer curved portions (3, 4).

7. ) A stator according to claim 1, characterized in that said first and second blades have first and second cross-sections, respectively, which are geometrically or dimensionally different from each other.

8. ) A stator according to claim 7, characterized in that said first and second cross-sections have respective dimensions measured along a common circumferential direction that are different from each other.

9. ) A stator according to claim 1, characterized in that at least said second blades have variable sections in the radial direction.

10. ) A stator according to claim 9, characterized in that at least said second blades have sections of maximum size close to said inner and outer curved portions (3, 4).

11. ) A stator according to claim 8, characterized in that the perimeter of each of said first sections is such that it can be inscribed in a corresponding perimeter of each of said second sections.