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) extending away from the cavity base (3) to a height extending beyond the leading edge (14); the rods (4) being positioned downstream of and in the proximity of the
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) extending away from the cavity base (3) to a height extending beyond the leading edge (14); the rods (4) being positioned downstream of and in the proximity of the leading edge (14). The rods (4) may extend to different heights and/or be positioned longitudinally offset (e.g. in a zig-zag pattern). The rods may be reversibly movable to a configuration in which they are fully enclosed in the cavity (2) when the cavity (2) is closed. Flow alteration elements (34, 38), for example channels (34) passing through the rods (4) and/or protrusions (38) extending from the rod (4) may be provided on the rods (4).
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1. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) extending in a direction away from a base (3) of the cavity (2) to a height that extends beyond the height of a leading edge (14) of the cavity (2), the leading edge (14) being relative to an actual or intended flo
1. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) extending in a direction away from a base (3) of the cavity (2) to a height that extends beyond the height 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);the rods (4) being positioned downstream of, and in the proximity of, the leading edge (14) of the cavity (2);wherein one or more flow alteration elements (34, 38) are provided on one or more of the rods (4);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); andwherein at least some of the flow alteration elements (34, 38) comprise a channel (34) passing through the rod (4). 2. The cavity system according to claim 1, wherein one or more of the rods (4) extends to a different height to one or more of the other rods (4). 3. The cavity system according to claim 1, wherein one or more of the rods (4) is positioned longitudinally offset with respect to one or more of the other rods (4). 4. The cavity system according to claim 3, wherein the longitudinal offset is in the form of a zig-zag pattern. 5. The cavity system according to claim 1, wherein the rods (4) are fixed in the cavity (2) in a manner that allows them to be reversibly moved to a further configuration in which they are fully enclosed in the cavity (2) when the cavity (2) is closed. 6. 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). 7. The cavity system according to claim 1, wherein at least two different types of flow alteration elements (34, 38) are provided. 8. 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). 9. The cavity system according to claim 8, 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). 10. The cavity system according to claim 9, 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). 11. The cavity system according to claim 1, wherein for one or more of the rods (4), at least a portion of the rod (4) slants in the flow direction (6). 12. 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). 13. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) extending in a direction away from a base (3) of the cavity (2) to a height that extends beyond the height 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);the rods (4) being positioned downstream of, and in the proximity of, the leading edge (14) of the cavity (2);wherein one or more flow alteration elements (34, 38) are provided on one or more of the rods (4);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); andwherein the flow alteration elements (34, 38) are at different heights on different rods (4). 14. The cavity system according to claim 13, wherein at least two different types of flow alteration elements (34, 38) are provided. 15. The cavity system according to claim 13, 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). 16. The cavity system according to claim 15, 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). 17. The cavity system according to claim 16, 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). 18. The cavity system according to claim 13, wherein for one or more of the rods (4), at least a portion of the rod (4) slants in the flow direction (6). 19. A cavity system, comprising: a cavity (2) and a plurality of rods (4);the rods (4) extending in a direction away from a base (3) of the cavity (2) to a height that extends beyond the height 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);the rods (4) being positioned downstream of, and in the proximity of, the leading edge (14) of the cavity (2);wherein one or more flow alteration elements (34, 38) are provided on one or more of the rods (4);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);wherein at least some of the flow alteration elements (34, 38) comprise a channel (34) passing through the rod (4); andwherein the flow alteration elements (34, 38) are at different heights on different rods (4).
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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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