IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0379788
(2009-02-27)
|
등록번호 |
US-8251648
(2012-08-28)
|
우선권정보 |
DE-10 2008 011 644 (2008-02-28) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Rolls-Royce Deutschland Ltd & Co KG
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
38 |
초록
▼
A fluid flow machine includes a flow path formed by a casing 1 and a rotating shaft 2, in which rows of blades 3 are provided, with at least one annular groove-type recess 4 being arranged in a blade 3 tip area in an annulus duct wall of the shaft 2. A cross-section and the position of the recess 4
A fluid flow machine includes a flow path formed by a casing 1 and a rotating shaft 2, in which rows of blades 3 are provided, with at least one annular groove-type recess 4 being arranged in a blade 3 tip area in an annulus duct wall of the shaft 2. A cross-section and the position of the recess 4 are defined as follows: the axial arrangement is selected such that a partial length A of the recess 4 extends by max. 30 percent of the chord length of a blade 3 from the blade 3 leading edge against the direction of flow, and up to max. 50 percent of the chord length of the blade 3 from the blade 3 leading edge in the direction of flow.
대표청구항
▼
1. A fluid flow machine comprising: a casing;a rotating shaft;a flow path formed between the casing and the rotating shaft;rows of blades positioned in the flow path;a plurality of spaced apart recesses disposed circumferentially around a surface facing free blade tips of at least one row of blades
1. A fluid flow machine comprising: a casing;a rotating shaft;a flow path formed between the casing and the rotating shaft;rows of blades positioned in the flow path;a plurality of spaced apart recesses disposed circumferentially around a surface facing free blade tips of at least one row of blades in an area of the free blade tips, the recesses and the free blade tips being circumferentially movable relative to one another, the recesses being open to the free blade tips and otherwise closed, wherein a cross-section and position of each recess are defined as follows: an axial arrangement is configured such that a partial length of the recess extends by a maximum of 30 percent of a chord length of a blade from a leading edge of the blade against a direction of flow, and up to a maximum of 50 percent of the chord length of the blade from the blade leading edge in the direction of flow,an angle β of a leading flank of the recess is inclined by 30° to 180° to a wall of the casing,an angle α of a trailing flank of the recess is inclined by 20° to 70° to the wall of the casing,a radial depth of the recess is a maximum of 50 percent of an axial chord length of the blade,an angle γ of a forward surface of the recess lies between 30° and 60° in a circumferential direction, andan inclination angle δ of a rearward surface of the recess lies between 30° and 60° in the circumferential direction;wherein each recess extends along an axis to maintain a straight air flow through the recess. 2. The fluid flow machine of claim 1, wherein the recess has an angular cross-section. 3. The fluid flow machine of claim 1, wherein the recess has a round cross-section. 4. The fluid flow machine of claim 1, wherein the recess has an oval cross-section. 5. The fluid flow machine of claim 1, wherein the recess has a variable geometry. 6. The fluid flow machine of claim 1, wherein the recess has a cross-sectional configuration of a half-heart shape. 7. The fluid flow machine of claim 1, wherein a stagger angle ζ of a trailing edge of the recess lies between +30° and −30° in the axial direction. 8. The fluid flow machine of claim 1, wherein a width D of the recess is a maximum of 15 percent of a distance between one rotor blade and the next. 9. The fluid flow machine of claim 1, wherein the at least one recess is a circumferential groove on the facing surface. 10. The fluid flow machine of claim 1, wherein the at least one row of blades is a row of stator blades and the facing surface is a surface of the rotating shaft. 11. The fluid flow machine of claim 1, wherein the at least one row of blades is a row of rotor blades and the facing surface is a surface of the casing. 12. The fluid flow machine of claim 1, wherein the depth of the recess is approximately 35 percent of the axial chord length of the blade. 13. The fluid flow machine of claim 12, wherein the recess has a cross-sectional configuration of a half-heart shape. 14. The fluid flow machine of claim 13, wherein a degree of coverage, which is defined as a ratio of the open areas of the at least one recess and the area circumferentially confined by the at least one recess, is less than 50 percent. 15. The fluid flow machine of claim 14, wherein the degree of coverage is less than 30 percent. 16. The fluid flow machine of claim 15, wherein a stagger angle ε of a leading edge of the recess lies between +30° and −30° in an axial direction. 17. The fluid flow machine of claim 16, wherein a stagger angle ζ of a trailing edge of the recess lies between +30° and −30° in the axial direction. 18. The fluid flow machine of claim 17, wherein a width D of the recess is a maximum of 15 percent of a distance between one rotor blade and the next. 19. The fluid flow machine of claim 1, wherein a degree of coverage, which is defined as a ratio of the open areas of the at least one recess and the area circumferentially confined by the at least one recess, is less than 50 percent. 20. The fluid flow machine of claim 19, wherein the degree of coverage is less than 30 percent. 21. The fluid flow machine of claim 1, wherein a stagger angle ζ of a leading edge of the recess lies between +30° and −30° in an axial direction. 22. The fluid flow machine of claim 21, wherein a stagger angle (of a trailing edge of the recess lies between +30° and −30° in the axial direction. 23. The fluid flow machine of claim 1, and further comprising a plurality of the recesses in a repeating pattern around a circumference of the facing surface. 24. The fluid flow machine of claim 23, wherein the plurality of recesses are predominately axially aligned.
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