A cavity system that tends to increase the thickness (28) of the shear layer (22), comprising: a cavity (2) and a plurality of rods (4), for example between two and six rods; the rods (4) are positioned in the proximity of a leading edge (14) of the cavity (2) and extending across at least a part of
A cavity system that tends to increase the thickness (28) of the shear layer (22), comprising: a cavity (2) and a plurality of rods (4), for example between two and six rods; the rods (4) are positioned in the proximity of a leading edge (14) of the cavity (2) and extending across at least a part of a width of the cavity (2) in a perpendicular or oblique angle to the actual or intended flow direction (6). One or more of the rods (4) may be positioned further along the flow direction (6) compared to one or more of the other rods (4), for example to provide a zig-zag pattern of rod positions. One or more flow alteration elements (34, 38), for example channels (34) passing through the rods (4) and/or protrusions (38) extending from the rods (4), may be provided on one or more of the rods (4).
대표청구항▼
1. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) are positioned in the proximity of a leading edge (14) of the cavity (2), the leading edge (14) being relative to an actual or intended flow direction (6) of a fluid over the cavity (2);each of the rods (4) extendi
1. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) are positioned in the proximity of a leading edge (14) of the cavity (2), the leading edge (14) being relative to an actual or intended flow direction (6) of a fluid over the cavity (2);each of the rods (4) extending lengthwise across at least a part of a width of the cavity (2) in a perpendicular or oblique angle to the actual or intended flow direction (6);wherein one or more of the rods (4) is positioned further along the flow direction (6) compared to one or more of the other rods (4); andwherein the positioning of one or more of the rods (4) further along the flow direction (6) compared to one or more of the other rods (4) provides a zig-zag pattern of rod positions. 2. The cavity system according to claim 1, wherein all the rods (4) are downstream of the leading edge (14). 3. The cavity system according to claim 1, wherein the rods (4) are positioned at a distance from the leading edge (14) that is ≦0.2×the distance between the leading edge (14) and an aft edge (16). 4. The cavity system according to claim 3, wherein the rods (4) are positioned at a distance from the leading edge (14) that is ≦0.1×the distance between the leading edge (14) and the aft edge (16). 5. The cavity system according to claim 4, wherein the rods (4) are positioned at a distance from the leading edge (14) that is ≦0.05×the distance between the leading edge (14) and the aft edge (16). 6. The cavity system according to claim 1, wherein the number (n) of rods in the plurality is 2≦n≦6. 7. The cavity system according to claim 6, wherein the number (n) of rods in the plurality is 3≦n≦6. 8. The cavity system according to claim 1, wherein the effect of the rods (4) is to increase the thickness (28) of the shear layer (22). 9. The cavity system according to claim 1, wherein one or more flow alteration elements (34, 38) are provided on one or more of the rods (4). 10. The cavity system according to claim 1, wherein at least some of the flow alteration elements (34, 38) comprise a protrusion (38) extending from the rod (4). 11. The cavity system according to claim 1, wherein the flow alteration elements (34, 38) are at different positions along the rod (4) on different rods (4). 12. The cavity system according to claim 1, wherein at least two different types of flow alteration elements (34, 38) are provided. 13. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) are positioned in the proximity of a leading edge (14) of the cavity (2), the leading edge (14) being relative to an actual or intended flow direction (6) of a fluid over the cavity (2);each of the rods (4) extending lengthwise across at least a part of a width of the cavity (2) in a perpendicular or oblique angle to the actual or intended flow direction (6);wherein one or more flow alteration elements (34, 38) are provided on one or more of the rods (4); andwherein at least some of the flow alteration elements (34, 38) comprise a channel (34) passing through the rod (4). 14. The cavity system according to claim 13, wherein at least some of the flow alteration elements (34, 38) comprise or provide additional edges at the one or more rods (4) that are in addition to the edge or edges provided by the underlying shape of the rod or rods (4). 15. The cavity system according to claim 13, wherein at least some of the flow alteration elements (34, 38) comprise a protrusion (38) extending from the rod (4). 16. The cavity system according to claim 13, wherein the flow alteration elements (34, 38) are at different positions along the rod (4) on different rods (4). 17. The cavity system according to claim 13, wherein at least two different types of flow alteration elements (34, 38) are provided. 18. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) are positioned in the proximity of a leading edge (14) of the cavity (2), the leading edge (14) being relative to an actual or intended flow direction (6) of a fluid over the cavity (2);each of the rods (4) extending lengthwise across at least a part of a width of the cavity (2) in a perpendicular or oblique angle to the actual or intended flow direction (6);wherein one or more of the rods (4) is positioned further along the flow direction (6) compared to one or more of the other rods (4);wherein the positioning of one or more of the rods (4) further along the flow direction (6) compared to one or more of the other rods (4) provides a zig-zag pattern of rod positions;wherein one or more flow alteration elements (34, 38) are provided on one or more of the rods (4); andwherein at least some of the flow alteration elements (34, 38) comprise a channel (34) passing through the rod (4). 19. The cavity system according to claim 18, wherein the flow alteration elements (34, 38) are at different positions along the rod (4) on different rods (4). 20. The cavity system according to claim 18, wherein at least two different types of flow alteration elements (34, 38) are provided.
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이 특허에 인용된 특허 (4)
McGrath Stephen F. (Kettering OH) Shaw Leonard L. (Troy OH), Aircraft cavity acoustic resonance suppression system.
Smith Robert A. (Ridgecrest CA) Gutmark Ephraim (Ridgecrest CA) Schadow Klaus C. (Ridgecrest CA) Wilson Kenneth J. (Ridgecrest CA), Suppressor of oscillations in airframe cavities.
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