초록 ▼

The present invention involves a system for altering the aerodynamic shape and/or fluid flow about a solid body. The preferred embodiment comprises an obstruction disposed on the solid body and extending outwardly from the solid body into the fluid flowing over the solid body and a synthetic jet act

The present invention involves a system for altering the aerodynamic shape and/or fluid flow about a solid body. The preferred embodiment comprises an obstruction disposed on the solid body and extending outwardly from the solid body into the fluid flowing over the solid body and a synthetic jet actuator embedded in the solid body such that said fluid flowing over the solid body encounters the obstruction before the synthetic jet actuator. The synthetic jet actuator includes a jet housing defined by walls, the jet housing having an internal chamber with a volume of fluid and an opening in the jet housing connecting the chamber to an external environment having the fluid, and a volume changing means for periodically changing the volume within the internal chamber so that a series of fluid vortices are generated and projected in the external environment out from the opening of the jet housing. A synthetic jet stream is formed by the fluid vortices entraining the fluid of the external environment and is projected outwardly from the solid body. The fluid flowing over the solid body contacts the synthetic jet stream forming a recirculation region, thereby modifying both the flow field and the pressure distribution and similarly modifying both the lift and drag characteristics of the solid body.

대표청구항 ▼

The present invention involves a system for altering the aerodynamic shape and/or fluid flow about a solid body. The preferred embodiment comprises an obstruction disposed on the solid body and extending outwardly from the solid body into the fluid flowing over the solid body and a synthetic jet act

The present invention involves a system for altering the aerodynamic shape and/or fluid flow about a solid body. The preferred embodiment comprises an obstruction disposed on the solid body and extending outwardly from the solid body into the fluid flowing over the solid body and a synthetic jet actuator embedded in the solid body such that said fluid flowing over the solid body encounters the obstruction before the synthetic jet actuator. The synthetic jet actuator includes a jet housing defined by walls, the jet housing having an internal chamber with a volume of fluid and an opening in the jet housing connecting the chamber to an external environment having the fluid, and a volume changing means for periodically changing the volume within the internal chamber so that a series of fluid vortices are generated and projected in the external environment out from the opening of the jet housing. A synthetic jet stream is formed by the fluid vortices entraining the fluid of the external environment and is projected outwardly from the solid body. The fluid flowing over the solid body contacts the synthetic jet stream forming a recirculation region, thereby modifying both the flow field and the pressure distribution and similarly modifying both the lift and drag characteristics of the solid body. ted to the mounting member, the guide comprising: i) a hub having a first end and a second end; ii) a first flange operatively connected to the first end of the hub, the first flange having a first guiding surface; and iii) a second flange operatively connected to the second end of the hub, the second flange having a second guiding surface; f) the winding flange guide positioned to contact the tape pancake at or after the point of tangency, wherein the tape pancake is guided between the first and second guiding surfaces; g) the first flange and the second flange having a land section having a length that is less than 100 times the thickness of the magnetic tape; h) the length of the land sections are greater than 10 times the thickness of the tape media; i) the first and second guiding surfaces are spaced at a distance, the distance is from 0.0002 inches to 0.0012 inches greater than the width of the magnetic tape and the guiding surfaces having a finish of at least 8Ra microinches; and j) a pack wheel, the winding flange guide positioned between the pack wheel and the idler guide. 2. The tape-up reel assembly of claim 1, further comprising the winding flange guide being mounted with a bias to contact the tape pancake and move as the tape pancake changes in size. 3. A take-up reel assembly for receiving a magnetic tape having a thickness and a width, from a tape source, comprising: a) a rotatable take-up reel, the magnetic tape having a first end operatively connected to the take-up reel; b) a rotatable idler guide positioned between the take-up reel and tape source; c) the magnetic tape forming a tape pancake as the magnetic tape is wound around the take-up reel, and creating a tangent point where the magnetic tape contacts the tape pancake; d) a winding flange guide, the guide comprising: i) a hub having a first end and a second end; ii) a first flange operatively connected to the first end of the hub, the first flange having a first guiding surface; and iii) a second flange operatively connected to the second end of the hub, the second flange having a second guiding surface; e) the winding flange guide positioned to contact the tape pancake at or after the point of tangency, wherein the tape pancake is guided between the first and second guiding surfaces; and f) a pack wheel, the winding flange guide positioned between the pack wheel and the idler guide. 4. The take-up reel of claim 3, further comprising the first flange and the second flange having a land section with a length that is less than 100 times the thickness of the magnetic tape. 5. The take-up reel of claim 4, wherein the land length of the first and second flanges is less than 60 times the thickness of the magnetic tape. 6. The take-up reel of claim 4, wherein the length of the land section is greater than 10 times the thickness of the magnetic tape. 7. The take-up reel of claim 3, further comprising the first and second guiding surfaces are spaced at a distance, the distance is from 0.0002 inches to 0.0012 inches greater than the width of the magnetic tape and the guiding surfaces having a finish of at least 8Ra microinches. 8. The take-up reel of claim 7, wherein the distance is from 0.0002 inches to 0.0007 inches greater than the width of the magnetic tape. 9. A servo writer comprising: a) a mounting member; b) a rewind assembly plate slidably mounted to the mounting member; c) a take-up reel rotatably mounted to the mounting member; d) a rotatable idler guide operatively connected to the mounting member; e) a magnetic tape forming a tape pancake as the magnetic tape is wound around the take-up reel, and creating a tangent point where the magnetic tape contacts the tape pancake; f) a winding flange guide operatively connected to the rewind assembly plate, the guide comprising: i) a hub having a first end and a second end; ii) a first flange operatively connected to the first end of the hub, the first flange having a firs t guiding surface; and iii) a second flange operatively connected to the second end of the hub, the second flange having a second guiding surface; g) the winding flange guide positioned to contact the tape pancake at or after the point of tangency, wherein the tape pancake is guided between the first and second guiding surfaces; and h) a pack wheel operatively connected to the rewind plate assembly, the winding flange guide positioned between the pack wheel and the idler guide. 10. The servo writer of claim 9, further comprising the first flange and the second flange having a land section having a length that is less than 100 times the thickness of the magnetic tape. 11. The servo writer of claim 10, wherein the length of the land section is greater than 10 times the thickness of the tape media. 12. The servo writer of claim 11, further comprising the first and second guiding surfaces are spaced at a distance, the distance is from 0.0002 inches to 0.0012 inches greater than the width of the magnetic tape and the guiding surfaces having a finish of at least 8Ra microinches. 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