Method and system of extracting energy from wind
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-009/00
H02P-009/04
출원번호
US-0384555
(2010-05-26)
등록번호
US-8330289
(2012-12-11)
국제출원번호
PCT/US2010/036119
(2010-05-26)
§371/§102 date
20120117
(20120117)
국제공개번호
WO2011/011109
(2011-01-27)
발명자
/ 주소
Tuttle, John R.
출원인 / 주소
Windpipe Corporation
대리인 / 주소
Scott, Mark E.
인용정보
피인용 횟수 :
2인용 특허 :
15
초록▼
Extracting energy from wind. At least some of the illustrative embodiments are methods including: directing a fluid flow across an aperture of an elongated cavity, the directing the fluid flow across the aperture at a non-right angle to a central axis defined by an entrance portion of the elongated
Extracting energy from wind. At least some of the illustrative embodiments are methods including: directing a fluid flow across an aperture of an elongated cavity, the directing the fluid flow across the aperture at a non-right angle to a central axis defined by an entrance portion of the elongated cavity, and the elongated cavity has a resonant frequency; creating pressure waves within the elongated cavity, the pressure waves created at least in part by vortices within the fluid flow across the aperture; exciting a resonant structure by way of the pressure waves within the elongated cavity, the resonant structure coupled to the elongated cavity and the resonant structure configured to resonant at substantially the resonant frequency; and extracting energy from oscillatory motion of the resonant structure.
대표청구항▼
1. A method comprising: directing a fluid flow across an aperture of an elongated cavity, the directing the fluid flow across the aperture at a non-right angle to a central axis defined by an entrance portion of the elongated cavity, and the elongated cavity has a resonant frequency;creating pressur
1. A method comprising: directing a fluid flow across an aperture of an elongated cavity, the directing the fluid flow across the aperture at a non-right angle to a central axis defined by an entrance portion of the elongated cavity, and the elongated cavity has a resonant frequency;creating pressure waves within the elongated cavity, the pressure waves created at least in part by vortices within the fluid flow across the aperture;exciting a resonant structure by way of the pressure waves within the elongated cavity, the resonant structure coupled to the elongated cavity and the resonant structure configured to resonate at substantially the resonant frequency; andextracting energy from oscillatory motion of the resonant structure. 2. The method of claim 1 wherein directing the fluid flow further comprises directing the fluid flow across the aperture where the aperture defines a first plane, and wherein an angle between the first plane and a second plane, the central axis normal to the second plane, is between 10 and 50 degrees inclusive. 3. The method of claim 1 wherein directing the fluid flow further comprises directing the fluid flow across the aperture where the aperture defines a first plane, and wherein an angle between the first plane and a second plane, the central axis normal to the second plane, is between 28 and 33 degrees inclusive. 4. The method of claim 1 wherein creating pressure waves further comprises controlling a frequency of vortex creation by adjusting a length of the aperture, the length measured along the direction of the fluid flow. 5. The method of claim 4 wherein adjusting the length of the aperture further comprises sliding a gate across the aperture, the gate partially blocks the aperture. 6. The method of claim 1 wherein creating pressure waves further comprises controlling a frequency of vortex creation by adjusting velocity of the fluid across the aperture. 7. The method of claim 6 wherein adjusting velocity of the fluid across the aperture further comprises changing an effective fluid collection area, wherein fluid collected in the fluid collection area is directed across the aperture. 8. The method of claim 1 wherein directing the fluid flow across the aperture further comprises: collecting fluid flow with a duct having a collection aperture that defines a first area, the fluid has a first velocity at the collection aperture, and the duct has a section of reduced cross-section that facilitates an increase in fluid velocity; anddirecting the fluid flow across the aperture of the elongated cavity. 9. The method of claim 1 wherein exciting the resonant structure further comprises exciting a spring and mass system by the pressure waves that cause movement of a flexible diaphragm coupled to the spring and mass system. 10. The method of claim 9 wherein extracting energy further comprises generating electrical energy from the oscillatory motion. 11. The method of claim 1 wherein directing further comprises directing the fluid flow across the aperture of the elongated cavity that defines the aperture on a first end and a closed second end opposite the first end. 12. The method of claim 1 wherein directing further comprises directing the fluid flow across the aperture of the elongated cavity that defines the aperture on a first end and an open second end opposite the second end. 13. The method of claim 1 wherein directing further comprises directing fluid flow across a tube that defines the elongated cavity. 14. The method of claim 1 wherein directing further comprises directing the fluid flow across the aperture of the elongated cavity where the elongated defines a central line, and where the central line is at least one selected from the group consisting of: straight; and curved. 15. The method of claim 1 further comprising rotating the entrance portion of the elongated cavity to align with a direction of fluid flow. 16. A system comprising: a structure that defines an elongated cavity that has a first resonant frequency;an entrance portion of the elongated cavity that defines an aperture, the entrance portion defines a central axis, two points on opposite sides of the aperture define a line segment, and the line segment intersects the central axis at a non-right angle; anda resonant structure configured to mechanically oscillate at the first resonant frequency, the resonant structure fluidly coupled to the elongated cavity, and wherein pressure waves in the elongated cavity cause the resonant structure to oscillate. 17. The system of claim 16 further comprising a duct system in operational relationship to the entrance portion, the duct system configured to direct a fluid flow across the aperture, and wherein the direction of fluid flow across the aperture at a non-right angle to the central axis. 18. The system of claim 17 wherein the duct system further comprises: a collection aperture that defines a first cross-sectional area, and wherein fluid flow across the first cross-sectional area has first velocity; anda reduced area duct portion fluidly coupled to the collection aperture, the reduced area duct portion defines a second cross-sectional area smaller than the first cross-sectional area;wherein the reduced area duct portion directs the fluid flow across the aperture. 19. The system of claim 18 further comprising wherein the first cross-sectional area of the collection aperture is configured to change to maintain a fluid flow velocity within the reduced area duct portion within a predetermined range. 20. The system of claim 17 further comprising: the duct system mechanically coupled to the entrance portion of the elongated cavity; andthe entrance portion rotationally coupled to the elongated cavity;wherein the duct system and entrance portion are configured to rotate such that the duct system collects fluid flow from a plurality of different directions. 21. The system of claim 20 further comprising wherein the duct system and entrance portion are configured to rotate through 360 degrees of rotation. 22. The system of claim 16 further comprising the entrance portion rotationally coupled to the elongated cavity such that the entrance portion is configured to rotate through 360 degrees of rotation. 23. The system of claim 16 further comprising a gate structure in operational relationship to the aperture, and wherein the gate structure is configured to change an exposed area of the aperture based on velocity of fluid that flows across the aperture. 24. The system of claim 16 wherein the resonant structure further comprises: a flexible diaphragm having a first surface exposed to the elongated cavity;a spring coupled to the diaphragm; anda mass coupled to the spring;wherein the pressure waves in the elongated cavity cause the flexible diaphragm to oscillate, and the flexible diagram causes the spring and mass to oscillate. 25. The system of claim 24 wherein electrical energy is generated based on the oscillation of the resonant structure. 26. The system of claim 16 wherein mechanical energy is extracted from the oscillation of the resonant structure. 27. The system of claim 16 wherein the angle between the line segment and the central axis is between 10 and 50 degrees inclusive. 28. The system of claim 16 wherein the angle between the line segment and the central axis is between 28 and 33 degrees inclusive. 29. The system of claim 16 wherein the elongated cavity defines a central line, and wherein the central line is curved. 30. The system of claim 16 wherein the structure that defines the elongated cavity comprises, at least in part, a tube. 31. The system of claim 16 wherein the elongated cavity defines a first cross-sectional shape, and the entrance portion defines a second cross-sectional shape, and wherein the first and second cross-sectional shapes are the same. 32. The system of claim 31 wherein dimensions of the first cross-sectional shape and the second cross-sectional shape are the same. 33. The system of claim 16 wherein the elongated cavity has a closed end opposite the aperture. 34. A method of generating electrical energy from wind comprising: directing air flow across an aperture of an elongated cavity that has a resonant frequency, an entrance portion of the elongated cavity defines a central axis, and the acute angle between the central axis and the direction of air flow is between 10 and 50 degrees inclusive;creating pressure waves within the elongated cavity at least in part by vortices within air flow across the aperture, and a frequency at which vortices are created substantially the same as the resonant frequency of the elongated cavity;exciting a resonant structure by way of the pressure waves within the elongated cavity, the resonant structure configured to resonate substantially at the resonant frequency; andgenerating electrical energy from oscillatory motion of the resonant structure. 35. The method of claim 34 wherein directing the air flow further comprises directing the air flow where the acute angle between the central axis and the direction of air flow is between 28 and 33 degrees inclusive. 36. The method of claim 34 further comprising controlling the frequency at which vortices are created by adjusting a length of the aperture, the length measured along the direction of the air flow. 37. The method of claim 36 wherein adjusting the length of the aperture further comprises sliding a gate across the aperture, the gate partially blocks the aperture. 38. The method of claim 36 wherein controlling the frequency at which vortices are created further comprises controlling a Strouhal number to be within predetermined range. 39. The method of claim 34 further comprising controlling the frequency at which vortices are created by adjusting the velocity of the air flow across the aperture. 40. The method of claim 39 wherein adjusting the velocity further comprises changing a collection area of air flow directed across the aperture. 41. The method of claim 34 wherein exciting the resonant structure further comprises exciting a spring and mass system by movement of a flexible diaphragm caused by pressure waves within the elongated cavity. 42. The method of claim 34 wherein directing further comprises directing air flow across a tube that defines the elongated cavity. 43. The method of claim 34 wherein directing further comprises directing the air flow across the aperture of the elongated cavity where the elongated cavity defines a central line, and where the central line is curved. 44. A system to extract electrical energy from wind comprising: a structure that defines an elongated cavity that has a first resonant frequency;an entrance portion of the elongated cavity that defines an aperture, and air flow is directed across the aperture, the entrance portion defines a central axis and the acute angle between the central axis and the direction of air flow is between 10 and 50 degrees inclusive;a resonant structure configured to mechanically oscillate at the first resonant frequency, the resonant structure fluidly coupled to the elongated cavity; andan electrical generator mechanically coupled to the resonant structure;wherein pressure waves within the elongated cavity caused by the vortex shedding across the aperture cause the resonant structure to mechanically oscillate, and wherein the electrical generator creates electrical energy from the mechanical oscillation. 45. The system of claim 44 further comprising a duct system in operational relationship to the entrance portion, the duct system configured to direct air flow across the aperture. 46. The system of claim 45 wherein the duct system further comprises: a collection aperture that defines a first cross-sectional area, and wherein air flow across the first cross-sectional area has first velocity; anda reduced area duct portion fluidly coupled to the collection aperture, the reduced area duct portion defines a second cross-sectional area smaller than the first cross-sectional area;wherein the reduced area duct portion directs the air flow across the aperture. 47. The system of claim 45 further comprising: the duct system mechanically coupled to the entrance portion of the elongated cavity; andthe entrance portion rotationally coupled to the elongated cavity;wherein the duct system and entrance portion are configured to rotate such that the duct system collects air flow from a plurality of different directions. 48. The system of claim 44 further comprising a gate structure in operational relationship to the aperture, and wherein the gate structure is configured to change an area of the aperture exposed based on velocity of fluid that flows across the aperture. 49. The system of claim 44 wherein the resonant structure further comprises: a flexible diaphragm having a first surface exposed to the elongated cavity;a spring coupled to the diaphragm; anda mass coupled to the spring;wherein the pressure waves in the elongated cavity cause the flexible diaphragm to oscillate, and the flexible diaphragm cause the spring and mass to oscillate. 50. The system of claim 44 wherein the acute angle between the central axis and the direction of air flow across the aperture is between and including 28 and 33 degrees.
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이 특허에 인용된 특허 (15)
Buchanan Ronnie J. ; Butterfield ; Jr. Charles A., Apparatus and method for generating electricity from energy in a flowing stream of fluid.
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Hsu, Sean Nean, Apparatus for generating energy from a fluid flow induced movement of a surface structure relative to an opening to a cavity in a frame.
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