IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0668820
(2003-09-22)
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발명자
/ 주소 |
- Ortega,Jason M.
- Sabari,Kambiz
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출원인 / 주소 |
- The Regents of the University of California
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인용정보 |
피인용 횟수 :
37 인용 특허 :
8 |
초록
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An apparatus for reducing the aerodynamic base drag of a bluff body having a leading end, a trailing end, a top surface, opposing left and right side surfaces, and a base surface at the trailing end substantially normal to a longitudinal centerline of the bluff body, with the base surface joined (1)
An apparatus for reducing the aerodynamic base drag of a bluff body having a leading end, a trailing end, a top surface, opposing left and right side surfaces, and a base surface at the trailing end substantially normal to a longitudinal centerline of the bluff body, with the base surface joined (1) to the left side surface at a left trailing edge, (2) to the right side surface at a right trailing edge, and (3) to the top surface at a top trailing edge. The apparatus includes left and right vertical boattail plates which are orthogonally attached to the base surface of the bluff body and inwardly offset from the left and right trailing edges, respectively. This produces left and right vertical channels which generate, in a flowstream substantially parallel to the longitudinal centerline, respective left and right vertically-aligned vortical structures, with the left and right vertical boattail plates each having a plate width defined by a rear edge of the plate spaced from the base surface. Each plate also has a peak plate width at a location between top and bottom ends of the plate corresponding to a peak vortex of the respective vertically-aligned vortical structures.
대표청구항
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We claim: 1. An apparatus for reducing the aerodynamic base drag of a bluff body having a leading end, a trailing end, a top surface, a bottom surface, opposing left and right side surfaces, and a base surface at the trailing end substantially normal to a longitudinal centerline of the bluff body,
We claim: 1. An apparatus for reducing the aerodynamic base drag of a bluff body having a leading end, a trailing end, a top surface, a bottom surface, opposing left and right side surfaces, and a base surface at the trailing end substantially normal to a longitudinal centerline of the bluff body, said base surface joined to the left side surface at a left trailing edge, to the right side surface at a right trailing edge, to the bottom surface at a bottom trailing edge, and to the top surface at a top trailing edge, said apparatus comprising: left and right vertical boattail plates orthogonally attached to the base surface of the bluff body and inwardly offset from the left and right trailing edges, respectively, and from the top trailing edge, to produce left and right vertical channels which generate, in a flowstream substantially parallel to the longitudinal centerline, respective left and right vertically-aligned vortical structures therein, said left and right vertical boattail plates each having a plate width defined by a rear edge spaced from the base surface, with said plate width being shorter at top and bottom ends thereof than at the center to more quickly turn the flowstream around into the base surface at the top and bottom ends than at the center of the vertical boattail plate. 2. The apparatus of claim 1, further comprising an upper horizontal boattail plate orthogonally attached to the base surface of the bluff body and inwardly offset from the top trailing edge to produce an upper horizontal channel which generates, in the flowstream, an upper horizontally-aligned vortical structure therein, said upper horizontal boattail plate having a plate width defined by a rear edge spaced from the base surface, with said plate width being shorter at left and right ends thereof than at the center, and with the left end of the horizontal boattail plate adjacent the top end of the left vertical boattail plate without extending beyond each other, and the right end of the horizontal boattail plate adjacent the top end of the right vertical boattail plate without extending beyond each other, so that reduced corners are formed which turn the flowstream more quickly around into the base surface at the reduced corners than at the respective centers of the vertical and horizontal boattail plates. 3. The apparatus of claim 1 or 2, wherein the rear edges of the boattail plates are convexedly curvilinear. 4. The apparatus of claim 1 or 2, wherein the rear edges of the boattail plates are angled to produce wedge-shaped boattail plates. 5. An apparatus for reducing the aerodynamic base drag of a bluff body having a leading end, a trailing end, a top surface, a bottom surface opposing left and right side surfaces, and a base surface at the trailing end substantially normal to a longitudinal centerline of the bluff body, said base surface joined to the left side surface at a left trailing edge, to the right side surface at a right trailing edge, to the bottom surface at a bottom trailing edge, and to the top surface at a top trailing edge, said apparatus comprising: left and right vertical boattail plates orthogonally attached to the base surface of the bluff body and inwardly offset from the left and right trailing edges, respectively, and from the top trailing edge, to produce left and right vertical channels which generate, in a flowstream substantially parallel to the longitudinal centerline, respective left and right vertically-aligned vortical structures therein, said left and right vertical boattail plates having a non-rectangular geometry with a shorter plate width at top and bottom ends thereof than at the center to more quickly turn the flowstream around into the base surface at the top and bottom ends than at the center of the vertical boattail plate. 6. The vehicle attachment of claim 5, further comprising an upper horizontal boattail plate orthogonally attached to the base surface of the bluff body and inwardly offset from the top trailing edge to produce an upper horizontal channel which generates, in the flowstream, an upper horizontally-aligned vortical structure therein, said upper horizontal boattail plate having a non-rectangular geometry with a shorter plate width at left and right ends thereof than at the center, and with the left end of the horizontal boattail plate adjacent the top end of the left vertical boattail plate without extending beyond each other, and the right end of the horizontal boattail plate adjacent the top end of the right vertical boattail plate without extending beyond each other, so that reduced corners are formed which turn the flowstream more quickly around into the base surface at the reduced corners than at the respective centers of the vertical and horizontal boattail plates. 7. The vehicle attachment of claim 5 or 6, wherein said boattail plates have a convexedly curvilinear geometry. 8. The vehicle attachment of claim 5 or 6, wherein said boattail plates have a triangular geometry. 9. A vehicle attachment for reducing the aerodynamic base drag of a bluff body having a leading end, a trailing end, a top surface, a bottom surface, opposing left and right side surfaces, and a base surface at the trailing end substantially normal to a longitudinal centerline of the bluff body, said base surface joined to the left side surface at a left trailing edge, to the right side surface at a right trailing edge, to the bottom surface at a bottom trailing edge, and to the top surface at a top trailing edge, said apparatus comprising: left and right vertical boattail plates orthogonally connectable to the base surface of the bluff body so as to be inwardly offset from the left and right trailing edges, respectively, and from the top trailing edge, and produce left and right vertical channels which generate, in a flowstream substantially parallel to the longitudinal centerline, respective left and right vertically-aligned vortical structures therein, said left and right vertical boattail plates each having a plate width defined by a rear edge spaced from the base surface, with said plate width being shorter at top and bottom ends thereof than at the center to more quickly turn the flowstream around into the base surface at the top and bottom ends than at the center of the vertical boattail plate. 10. The vehicle attachment of claim 9, further comprising an upper horizontal boattail plate orthogonally attached to the base surface of the bluff body and inwardly offset from the top trailing edge to produce an upper horizontal channel which generates, in the flowstream, an upper horizontally-aligned vortical structure therein, said upper horizontal boattail plate having a plate width defined by a rear edge spaced from the base surface, with said plate width being shorter at left and right ends thereof than at the center, and with the left end of the horizontal boattail plate adjacent the top end of the left vertical boattail plate without extending beyond each other, and the right end of the horizontal boattail plate adjacent the top end of the right vertical boattail plate without extending beyond each other, so that reduced corners are formed which turn the flowstream more quickly around into the base surface at the reduced corners than at the respective centers of the vertical and horizontal boattail plates. 11. The vehicle attachment of claim 9 or 10, wherein the rear edges of the boattail plates are convexedly curvilinear. 12. The vehicle attachment of claim 9 or 10, wherein the rear edges of the boattail plates are angular to produce wedge-shaped boattail plates.
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