IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0862436
(2010-08-24)
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등록번호 |
US-8403271
(2013-03-26)
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발명자
/ 주소 |
- Domel, Neal D.
- Baruzzini, Dan J.
- Miller, Daniel N.
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출원인 / 주소 |
- Lockheed Martin Corporation
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
11 |
초록
▼
A tapered micro-plow, or a series of tapered micro-plows, are submerged in a boundary layer just upstream of a reflection point of an oblique shock. Each micro-plow develops a beneficial pair of vortices which redistribute high energy flow within the boundary layer such that flow separation is preve
A tapered micro-plow, or a series of tapered micro-plows, are submerged in a boundary layer just upstream of a reflection point of an oblique shock. Each micro-plow develops a beneficial pair of vortices which redistribute high energy flow within the boundary layer such that flow separation is prevented or delayed. The beneficial vortex pairs rotate about an axis that is parallel to the flow of fluid, and together rotate such that they induce a velocity on one another which tends to hold them near the surface and delay vortex lift-off.
대표청구항
▼
1. An apparatus for reducing shock-induced separation, the apparatus comprising: a micro-plow, the micro-plow having a wedge shape in topview and a centerline, the centerline being parallel to a direction of fluid flow over the micro-plow, the micro-plow comprising:a nose segment having a nose and a
1. An apparatus for reducing shock-induced separation, the apparatus comprising: a micro-plow, the micro-plow having a wedge shape in topview and a centerline, the centerline being parallel to a direction of fluid flow over the micro-plow, the micro-plow comprising:a nose segment having a nose and an apex, the apex located aft of the nose, the vertical height of the micro-plow increasing from the nose to the apex, and the vertical height of the micro-plow decreasing from the apex to an aft point, the nose comprising a pair of nose sidewalls located on the nose segment, each nose sidewall diverging from the centerline at a nose-angle;a glove segment of the micro-plow, located aft of the apex, the glove segment having glove sidewalls each diverging from the centerline at a glove-angle, the glove angle being greater than the nose-angle;a main plow segment of the micro-plow, the main plow segment located aft of the apex, and having a main plow segment width that is greater than a width of the nose segment, wherein the main plow segment comprises a pair of plow segment sidewalls each diverging from the centerline at a plow-angle, the plow-angle being greater than the glove-angle, the plow segment sidewalls each terminating in an aft tip, the aft tips being located further from the centerline than any other portion of the micro-plow; anda recess located along the top and spanning between a portion of the glove and a portion of the main plow segment, the vertical height of the recess at the centerline being less than the vertical height of the sidewalls adjacent to the recess. 2. The apparatus according to claim 1, further comprising: an aft closure point located at the aft most portion of the recess, the aft closure point being centered on the centerline and located forward of the aft tips. 3. The apparatus according to claim 1, wherein the micro-plow further comprises a bottom having a surface area, wherein the surface area of the bottom is larger than a combined surface area of the sidewalls. 4. The apparatus according to claim 1, wherein the micro-plow generates a pair of vortices, each of the vortices rotating in opposite directions about a separate axis, each of the separate axes generally parallel to the centerline, and wherein each of the vortices is rotating toward the surface at a lateral point closest to the centerline and rotating away from the surface at a lateral point furthest from the centerline. 5. The apparatus according to claim 1, wherein the glove segment comprises three pairs of triangular-shaped facets. 6. A method for modifying fluid flow over a surface, the method comprising the steps of: placing a micro-plow on the surface, the micro-plow havinga wedge shape in topview and a centerline, the centerline being parallel to a direction of fluid flow over the micro-plow,a nose segment having a nose and an apex, the apex located aft of the nose, the nose comprising a pair of nose sidewalls located on the nose segment, each nose sidewall diverging from the centerline at a nose-angle, the vertical height of the micro-plow increasing from the nose to the apex, and the vertical height of the micro-plow decreasing from the apex to an aft point,a glove segment of the micro-plow, located aft of the apex, the glove segment having glove sidewalls each diverging from the centerline at a glove-angle, the glove angle being greater than the nose-angle,a main plow segment of the micro-plow, the main plow segment located aft of the apex, and having a main plow segment width that is greater than a width of the nose segment, wherein the main plow segment comprises a pair of plow segment sidewalls each diverging from the centerline at a plow-angle, the plow-angle being greater than the glove-angle, the plow segment sidewalls each terminating in an aft tip, the aft tips being located further from the centerline than any other portion of the micro-plow,a recess located along the top and spanning between a portion of the glove and a portion of the main plow segment, the vertical height of the recess at the centerline being less than the vertical height of the sidewalls adjacent to the recess, andan aft closure point located at the aft most portion of the recess, the aft closure point being centered on the centerline and located forward of the aft points;flowing a fluid over the micro-plow, the fluid having a boundary layer with a boundary layer height;parting the fluid with the nose of the micro-plow; anddeveloping rotational flow with the micro-plow, the rotational flow rotating inward and downward toward the centerline of the micro-plow. 7. The method according to claim 6, further comprising the step of keeping the rotational flow attached to the surface for a distance that is approximately ten times the height of the boundary layer. 8. The method according to claim 6, further comprising determining a location where an oblique shock will contact the surface and placing the micro-plow on the surface such that the oblique shock intersects the rotational flow at a point where the rotational flow is still attached to the surface. 9. The apparatus according to claim 6, wherein the height of the apex is approximately ⅓ the boundary layer height. 10. The method according to claim 8, wherein the streamwise distance from the micro-plow to the location where the oblique shock contacts the surface is approximately 10-15 times the height of the boundary layer. 11. The method according to claim 6, wherein a second oblique shock is directed toward a second surface, and further comprising placing a second micro-plow on the second surface, and generating a second rotational flow with the second micro-plow, such that the oblique shock intersects a second rotational flow. 12. The method according to claim 6, wherein the rotational flow comprises two rotating vortices, the two rotating vortices each rotating about a separate axis, each axis being generally parallel to the centerline. 13. The method according to claim 12, wherein each of the two rotating vortices develop a downwash that delays vortex lift-off by urging the other of the two rotating downwashes toward the surface. 14. The method according to claim 6, further comprising placing a plurality of laterally adjacent micro-plows on the surface. 15. A supersonic aircraft powered by a jet engine, comprising: a mixed compression air inlet to the jet engine;an interior surface located within the mixed compression air inlet, wherein an oblique shock develops and is reflected by the interior surface;a micro-plow located on the interior surface, the micro-plow having a centerline, the centerline being parallel to a direction of fluid flow over the micro-plow wherein a fluid having a boundary layer is flowing across the interior surface in a direction parallel to the centerline, the micro-plow comprising:a nose segment having a point and an apex, the apex located aft of the point, the vertical height of the apex being higher than any other portion of the micro-plow, the nose segment having a pair of nose sidewalls each diverging from the centerline at a nose-angle;a glove segment, the glove segment having glove sidewalls each diverging from the centerline at a glove-angle, the glove angle being greater than the nose-angle;a main plow segment, the main plow segment having a pair of plow segment sidewalls each diverging from the centerline at a plow-angle, the plow-angle being greater than the glove-angle, the plow segment sidewalls each terminating in an aft tip, the aft tips being located further from the centerline than any other portion of the micro-plow;a recess located along the top and spanning between a portion of the glove and a portion of the main plow segment, the vertical height of the recess at the centerline being less than the vertical height of the sidewalls adjacent to the recess;an aft closure point located at the aft most portion of the recess, the aft closure point being centered on the centerline and located forward of the aft tips; anda bottom, wherein a surface area of the bottom is larger than a combined surface area of the sidewalls; andwherein the micro-plow is affixed to the interior surface upstream of a reflection point on the surface wherein an oblique shock is reflected by the surface, and wherein the oblique shock does not induce separation when it encounters the boundary layer. 16. The apparatus according to claim 15, wherein the micro-plow generates a pair of vortices, each of the vortices rotating in opposite directions about a separate axis, each of the separate axes generally parallel to the centerline, and wherein each of the vortices is rotating toward the surface at a lateral point closest to the centerline and rotating away from the surface at a lateral point furthest from the centerline. 17. The apparatus according to claim 15, wherein the distance from the micro-plow to the reflection point equals approximately 10-15 times the height of the boundary layer. 18. The apparatus according to claim 15, wherein the height of the apex is approximately ⅓ the height of the boundary layer. 19. The apparatus according to claim 15, wherein the micro-plow is affixed to the surface upstream of a reflection point on the surface wherein an oblique shock is reflected by the surface, and wherein the oblique shock does not induce separation when it encounters the boundary layer. 20. The apparatus according to claim 15 comprising a second micro-plow laterally apart from the first mentioned micro-plow, wherein the space between one of the aft tips of the first mentioned micro-plow and one of the aft tips of the second micro-plow is less than the distance between the aft tips of the first mentioned micro-plow.
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