A conformal mapping technique to correlate the rotating flow around a wing section of vertical axis wind turbine and an equivalent linear flow around a static wing
In a vertical axis wind turbine (VAWT), turbine blades are subjected to the curved flow field caused by the revolution of turbine. However, performance prediction of VAWT is usually based on the fluid dynamic coefficients obtained in wind tunnel measurements of the two-dimensional static wing. The d...
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Published in | Environmental research letters Vol. 8; no. 4; pp. 44040 - 44049 |
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Format | Journal Article |
Language | English |
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2013
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Abstract | In a vertical axis wind turbine (VAWT), turbine blades are subjected to the curved flow field caused by the revolution of turbine. However, performance prediction of VAWT is usually based on the fluid dynamic coefficients obtained in wind tunnel measurements of the two-dimensional static wing. The difference of fluid dynamic coefficients in the curved flow and straight flow deteriorates the accuracy of performance prediction. To find the correlation between the two conditions of curved and straight flow, the authors propose a conformal mapping method on complex plane. It provides bidirectional mapping between the two flow fields. For example, the flow around a symmetric wing in the curved flow is mapped to that around a curved (cambered) wing in the straight flow. Although the shape of mapped wing section is different from the original one, its aerodynamic coefficients show a good correlation to those of the original in the rotating condition. With the proposed method, we can reproduce the local flow field around a rotating blade from the flow data around the mapped static wing in the straight flow condition. |
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AbstractList | In a vertical axis wind turbine (VAWT), turbine blades are subjected to the curved flow field caused by the revolution of turbine. However, performance prediction of VAWT is usually based on the fluid dynamic coefficients obtained in wind tunnel measurements of the two-dimensional static wing. The difference of fluid dynamic coefficients in the curved flow and straight flow deteriorates the accuracy of performance prediction. To find the correlation between the two conditions of curved and straight flow, the authors propose a conformal mapping method on complex plane. It provides bidirectional mapping between the two flow fields. For example, the flow around a symmetric wing in the curved flow is mapped to that around a curved (cambered) wing in the straight flow. Although the shape of mapped wing section is different from the original one, its aerodynamic coefficients show a good correlation to those of the original in the rotating condition. With the proposed method, we can reproduce the local flow field around a rotating blade from the flow data around the mapped static wing in the straight flow condition. |
Author | Akimoto, Hiromichi Hara, Yutaka Nakamura, Takuju Kawamura, Takafumi Lee, Yeon-Seung |
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Cites_doi | 10.1063/1.1896091 10.1016/j.renene.2013.02.002 10.1299/jsmeb.36.135 10.2514/3.62459 10.1088/1748-9326/6/4/044017 10.1080/17445302.2012.698896 |
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References | Paraschivoiu I (6) 1981 11 13 15 Muraca R J (1) 1975 17 Abbott I H (7) 1959 Akimoto H (14) 2013 Milgliore P G (2) 1979 3 Furukawa A (16) 1990; 50 Migliore P G (4) 1980 Sheldahl R E (8) 1981 Nakamura T (12) 2013 Akimoto H (10) 2011; 6 Paulsen U S (9) 2011 Strickland J H (5) 1975 |
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SubjectTerms | blade performance conformal mapping marine current turbine vertical axis wind turbine virtual camber |
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Title | A conformal mapping technique to correlate the rotating flow around a wing section of vertical axis wind turbine and an equivalent linear flow around a static wing |
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