卡门涡街风力发电机转子结构优化
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摘要
设计了一种将卡门涡街动能转换成电能的风力发电机,对转子结构进行优化。利用FLUENT对不同结构下转子的运动情况进行了计算。为了保证卡门涡街充分发展并且保持二维流动,选择雷诺数为200。改变转子与阻流体的距离以及转子长度2个参数。结果表明,不同结构下转子有振动、转动和混合运动3种运动方式。转子与阻流体的距离和转子的长度之间存在交互作用,必须进行耦合分析。当转子与阻流体的距离为阻流体特征长度的3.5倍,转子的长度为阻流体特征长度1.25倍时,装置发电效果最佳。
A wind energy harvester which can transform the kinetic energy of Karman vortex street into electricity based on electromagnetic induction principle is designed. An optimization process of the structure of the rotor is then conducted. The movement of rotor with different structures is studied numerically using Fluent. The Reynolds is 200 so as to make sure that the Karman vortex street is developed and that the flow remains 2-D. Two parameters are varied for investigation, the distance between rotor and bluff body and the length of rotor. It is found that there are three different patterns of rotor movement, vibration, rotation and mixed movement. There is a strong interaction between the two parameters. So the analysis of the two parameters can't be independent. When the distance between rotor and bluff body is 3.5 times of the characteristic length of bluff body and the length of rotor is 1.25 times of the characteristic length of bluff body, the equipment has the best output.
A wind energy harvester which can transform the kinetic energy of Karman vortex street into electricity based on electromagnetic induction principle is designed. An optimization process of the structure of the rotor is then conducted. The movement of rotor with different structures is studied numerically using Fluent. The Reynolds is 200 so as to make sure that the Karman vortex street is developed and that the flow remains 2-D. Two parameters are varied for investigation, the distance between rotor and bluff body and the length of rotor. It is found that there are three different patterns of rotor movement, vibration, rotation and mixed movement. There is a strong interaction between the two parameters. So the analysis of the two parameters can't be independent. When the distance between rotor and bluff body is 3.5 times of the characteristic length of bluff body and the length of rotor is 1.25 times of the characteristic length of bluff body, the equipment has the best output.
引文
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[10]Wang D A,Chiu C Y,Pham H T.Electromagnetic energy harvesting from vibrations induced by karman vortex street[J].Mechatronics,2012,22(6):746-756.
[11]Tam Nguyen Hai Dang,Pham Huy Tuan,Wang Dung An.A miniature pneumatic energy generator using karman vortex street[J].Journal of Wind Engineering and Industrial Aerodynamics,2013,116(4):40-48.
[12]Li Saiwei,Sun Zhiqiang.Harvesting vortex energy in the cylinder wake with a pivoting vane[J].Energy,2015(88):783-792.
[13]C H K Williamson,R Govardhan.Vortex-induced vibrations[J].Annual Review of Fluid Mechanics,2004,36(1):413-455.
[14]Miau J J,Liu T W.Vortex flowmeter designed with wall pressure measurement[J].Review of Scientific Instruments,1990,61(10):2676-2681.
[15]Venugopal A,Agrawal Amit,Prabhu S V.Influence of blockage and shape of a bluff body on the performance of vortex flowmeter with wall pressure measurement[J].Measurement,2011,44(5):954-964.
[16]C Norberg.Fluctuating lift on a circular cylinder:review and new measurements[J].Journal of Fluids and Structures,2003(17):57-96.
[2]Y Sudhakar,S Vengadesan.Vortex shedding characteristics of a circular cylinder with an oscillating wake splitter plate[J].Computers and Fluids,2012,53(15):40-52.
[3]J Wu,C Shu.Numerical study of flow characteristics behind a stationary circular cylinder with a flapping plate[J].Physics of Fluids,2011,23(7):1-7.
[4]Liaosha Tang,Michael P Paidoussis,Jin jiang.Cantilevered flexible plates in axial flow:Energy transfer and the concept of flutter-mill[J].Journal of Sound and Vibration,2009,326(19):263-276.
[5]Marico Sanchez Sanz,Belen Fernandez,Angel Velazquez.Energy-harvesting microresonator based on the forces generated by the karman street around a rectangular prism[J].Journal of Microelectromechanical Systems,2009,18(2):449-457.
[6]Taylor G W,Burns et al.The energy harvesting harvesting ell:a small subsurface ocean/river power generator[J].IEEE Journal of Oceanic Engineering,2001,26(4):539-547.
[7]Akaydin H D,Elvin N,Andreopoulos Y.Wake of a cylinder:a paradigm for energy harvesting with piezoelectric materials[J].Experiments in Fluids,2010,49(1):291-304.
[8]Marco Demori,Marco Ferrari,Vittorio Feeari,et al.Energy harvesting from von karman vortices in airflow for autonomous sensors[J].Procedia Engineering,2014(87):775-778.
[9]Dibin Zhu,Steve Beeby,John Tudor,et al.A novel miniature wind generator for wireless sensing applications[J].Sensors,2010,143(2):1415-1418.
[10]Wang D A,Chiu C Y,Pham H T.Electromagnetic energy harvesting from vibrations induced by karman vortex street[J].Mechatronics,2012,22(6):746-756.
[11]Tam Nguyen Hai Dang,Pham Huy Tuan,Wang Dung An.A miniature pneumatic energy generator using karman vortex street[J].Journal of Wind Engineering and Industrial Aerodynamics,2013,116(4):40-48.
[12]Li Saiwei,Sun Zhiqiang.Harvesting vortex energy in the cylinder wake with a pivoting vane[J].Energy,2015(88):783-792.
[13]C H K Williamson,R Govardhan.Vortex-induced vibrations[J].Annual Review of Fluid Mechanics,2004,36(1):413-455.
[14]Miau J J,Liu T W.Vortex flowmeter designed with wall pressure measurement[J].Review of Scientific Instruments,1990,61(10):2676-2681.
[15]Venugopal A,Agrawal Amit,Prabhu S V.Influence of blockage and shape of a bluff body on the performance of vortex flowmeter with wall pressure measurement[J].Measurement,2011,44(5):954-964.
[16]C Norberg.Fluctuating lift on a circular cylinder:review and new measurements[J].Journal of Fluids and Structures,2003(17):57-96.