IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0747112
(2008-12-15)
|
등록번호 |
US-9200522
(2015-12-01)
|
국제출원번호 |
PCT/US2008/086860
(2008-12-15)
|
§371/§102 date |
20100820
(20100820)
|
국제공개번호 |
WO2009/079470
(2009-06-25)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- University of Florida Research Foundation, Inc.
|
대리인 / 주소 |
Saliwanchik, Lloyd & Eisenschenk
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
15 |
초록
▼
A cooling system includes a surface comprising a plurality of orifices and a flow control plasma actuator positioned proximate an orifice to induce cooling air attachment to the surface. In an exemplary embodiment, the plasma actuator includes a power source, a first electrode in contact with a firs
A cooling system includes a surface comprising a plurality of orifices and a flow control plasma actuator positioned proximate an orifice to induce cooling air attachment to the surface. In an exemplary embodiment, the plasma actuator includes a power source, a first electrode in contact with a first dielectric layer and connected to the power source, a second electrode in contact with a second dielectric layer and connected to the power source, and a ground electrode. The power source drives the first electrode with a first ac voltage pattern and drives the second electrode with a second ac voltage pattern. The first voltage pattern and the second voltage pattern have a phase difference. In further embodiments, a dc voltage can be used to drive one or more of the electrodes, where the dc voltage can be pulsed in specific embodiments. In another embodiment, a cooling system includes a suction mechanism positioned proximate an orifice to induce cooling air attachment to the surface, the section mechanism being positioned downstream of the orifice.
대표청구항
▼
1. A device, comprising: a surface;an orifice positioned in the surface,wherein a cooling gas is output from the orifice such that the cooling gas output from the orifice has a cooling gas temperature and has a component of flow in a downstream direction, andwherein the downstream direction is paral
1. A device, comprising: a surface;an orifice positioned in the surface,wherein a cooling gas is output from the orifice such that the cooling gas output from the orifice has a cooling gas temperature and has a component of flow in a downstream direction, andwherein the downstream direction is parallel to the surface where the cooling gas is output from the orifice;a suction hole positioned in the surface proximate the orifice,wherein the suction hole has a pressure, Ps,wherein at least a portion of the suction hole is positioned downstream from the orifice,wherein at least another portion of the suction hole is positioned cross stream from the orifice,wherein a cross stream direction is perpendicular to the downstream direction,wherein the cross stream direction is parallel to the surface where the cooling gas is output from the orifice,wherein the device is configured such that when a hot flow of a gas or gas mixture having a hot flow temperature greater than the cooling gas temperature and having a flow pressure, Pf, greater than Ps, is flowing over the surface in the downstream direction over the orifice, a streamwise pressure and a crosswise pressure are caused by a pressure differential, ΔP, where ΔP=Pf−Ps,wherein the streamwise pressure and the crosswise pressure cause a force having a component of force in the cross stream direction to be exerted on the cooling gas output from the orifice, andwherein the force having the component of force in the cross stream direction exerted on the cooling gas output from the orifice enhances attachment of the cooling gas output from the orifice to the surface. 2. The device according to claim 1, wherein the cooling gas is air. 3. The device according to claim 1, wherein the surface is a turbine blade surface. 4. The device according to claim 1, wherein an exit plane of the orifice comprises a contoured edge protruding from the surface, andwherein the contoured edge protruding from the surface has a continuously curving smooth shape. 5. The device according to claim 4, wherein the contoured edge comprises a bumper. 6. The device according to claim 1, wherein an exit plane of the orifice comprises a compound slope region recessed from the surface. 7. The device according to claim 1, wherein an exit plane of the orifice comprises a rectangular slot recessed from the surface. 8. The device according to claim 1, wherein ΔP is constant. 9. The device according to claim 1, wherein the force having the force component in the cross stream direction exerted on the cooling gas output from the orifice pushes the cooling gas output from the orifice away from the orifice such that the cooling gas loses momentum and falls onto the surface. 10. The device according to claim 1, wherein the streamwise pressure is a streamwise pressure pulsation and the crosswise pressure is a crosswise pressure pulsation. 11. The device according to claim 1, wherein the hot flow of the gas or gas mixture is air. 12. The device according to claim 1, wherein a first portion of the suction hole is downstream from the orifice, andwherein a second portion of the suction hole is both downstream from the orifice and cross stream from the orifice. 13. The device according to claim 12, wherein a third portion of the suction hole is cross stream from the orifice. 14. The device according to claim 1, further comprising: a flow control plasma actuator,wherein at least a portion of the flow control plasma actuator is upstream from the orifice,wherein when the hot flow of the gas or gas mixture is flowing over the surface in the downstream direction over the orifice, the flow control actuator is actuated such that actuation of the flow control actuator causes a second force having a second force component in the cross stream direction to be exerted on the hot flow flowing toward the orifice, andwherein the second force having the second force component in the cross stream direction exerted on the hot flow flowing toward the orifice enhances attachment of cooling gas output from the orifice to the surface. 15. The device according to claim 14, wherein the flow control plasma actuator comprises:a first electrode in contact with a first dielectric layer and connected to a power source; anda ground electrode,wherein the power source drives the first electrode with a first voltage pattern with respect to the ground electrode, andwherein the first voltage pattern produces a first plasma discharge proximate the orifice and a first electric field pattern proximate the orifice. 16. The device according to claim 15, wherein the first voltage pattern is a dc voltage. 17. The device according to claim 15, wherein the first voltage pattern is an ac voltage. 18. The device according to claim 15, further comprising: a second electrode in contact with a second dielectric layer and connected to the power source,wherein the power source drives the second electrode with a second voltage pattern with respect to the ground electrode, andwherein application of the second voltage pattern produces a second plasma discharge in the control patch region and a second electric field pattern in the control patch region. 19. The device according to claim 18, wherein the first voltage pattern and the second voltage pattern have a phase difference. 20. A device, comprising: a surface;an orifice positioned in the surface,wherein a cooling gas is output from the orifice such that the cooling gas output from the orifice has a cooling gas temperature and has a component of flow in a downstream direction, andwherein the downstream direction is parallel to the surface where the cooling gas is output from the orifice; anda flow control plasma actuator positioned proximate the orifice,wherein at least a portion of the flow control plasma actuator is positioned downstream from the orifice,wherein at least another portion of the flow control plasma actuator is positioned cross stream from the orifice,wherein a cross stream direction is perpendicular to the downstream direction,wherein the cross stream direction is parallel to the surface where the cooling gas is output from the orifice,wherein the device is configured such that when a hot flow of a gas or a gas mixture, with a hot flow temperature greater than the cooling gas temperature, is flowing over the surface in the downstream direction over the orifice, the flow control plasma actuator is actuated such that actuation of the flow control plasma actuator causes a force having a force component in the cross stream direction to be exerted on the cooling gas output from the orifice, andwherein the force having the force component in the cross stream direction exerted on the cooling gas output from the orifice enhances attachment of the cooling gas flow output from the orifice to the surface. 21. The device according to claim 20, wherein the force having the force component in the cross stream direction exerted on the cooling gas output from the orifice pushes the cooling gas output from the orifice away from the orifice such that the cooling gas loses momentum and falls onto the surface. 22. The device according to claim 20, wherein the force having the force component in the cross stream direction exerted on the cooling gas output from the orifice pushes the cooling gas output from the orifice toward the orifice such that the cooling gas loses momentum and falls onto the surface. 23. The device according to claim 20, wherein the actuation of the flow control plasma actuator produces pressure pulsations. 24. The device according to claim 20, wherein the hot flow of the gas or gas mixture is air. 25. The device according to claim 20, wherein a first portion of the flow control plasma actuator is downstream from the orifice, andwherein a second portion of the flow control plasma actuator is both downstream from the orifice and cross stream from the orifice. 26. The device according to claim 25, wherein a third portion of the flow control plasma actuator is cross stream from the orifice. 27. The device according to claim 25, further comprising: a second flow control plasma actuator,wherein at least a portion of the second flow control plasma actuator is upstream from the orifice,wherein when the hot flow of the gas or gas mixture is flowing over the surface in the downstream direction over the orifice, the second flow control actuator is actuated such that actuation of the second flow control actuator causes a second force having a second force component in the cross stream direction to be exerted on the hot flow flowing toward the orifice, andwherein the second force having the second force component in the cross stream direction exerted on the hot flow flowing toward the orifice enhances attachment of cooling gas output from the orifice to the surface. 28. The device according to claim 20, wherein the cooling gas is air. 29. The device according to claim 20, wherein the flow control plasma actuator comprises:a first electrode in contact with a first dielectric layer and connected to a power source; anda ground electrode,wherein the power source drives the first electrode with a first voltage pattern with respect to the ground electrode, andwherein the first voltage pattern produces a first plasma discharge proximate the orifice and a first electric field pattern proximate the orifice. 30. The device according to claim 29, further comprising: a second electrode in contact with a second dielectric layer and connected to the power source,wherein the power source drives the second electrode with a second voltage pattern with respect to the ground electrode, andwherein application of the second voltage pattern produces a second plasma discharge proximate the orifice and a second electric field pattern proximate the orifice. 31. The device according to claim 30, wherein the first voltage pattern and the second voltage pattern have a phase difference. 32. The device according to claim 29, wherein the first voltage pattern is a dc voltage. 33. The device according to claim 29, wherein the first voltage pattern is an ac voltage. 34. The device according to claim 20, wherein the surface is a turbine blade surface. 35. The device according to claim 20, wherein an exit plane of the orifice comprises a contoured edge protruding from the surface, andwherein the contoured edge protruding from the surface has a continuously curving smooth shape. 36. The device according to claim 35, wherein the contoured edge comprises a bumper. 37. The device according to claim 20, wherein an exit plane of the orifice comprises a compound slope region recessed from the surface. 38. The device according to claim 20, wherein an exit plane of the orifice comprises a rectangular slot recessed from the surface.
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