Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine
Effect of the Reynolds number on the torque and power characteristics of a small straight-bladed vertical axis wind turbine has been investigated experimentally under various wind velocity. The maximum mean torque coefficient and the maximum mean power coefficient increase with increasing the Reynol...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2016-08-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/11/3/11_2016jfst0014/_pdf/-char/en |
| _version_ | 1798020974204944384 |
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| author | Seiji YAMADA Tomohiro TAMURA Shinsuke MOCHIZUKI |
| author_facet | Seiji YAMADA Tomohiro TAMURA Shinsuke MOCHIZUKI |
| author_sort | Seiji YAMADA |
| collection | DOAJ |
| description | Effect of the Reynolds number on the torque and power characteristics of a small straight-bladed vertical axis wind turbine has been investigated experimentally under various wind velocity. The maximum mean torque coefficient and the maximum mean power coefficient increase with increasing the Reynolds number based on the wind velocity and representative length of the wind turbine, and the dependence of these coefficients on the Reynolds number can be successfully approximated in the logarithmic function. The tip speed ratio for the maximum mean torque coefficient is almost independent of the Reynolds number. Otherwise, the tip speed ratio for the maximum power coefficient increases as increasing Reynolds number, and the dependence of the maximum mean torque coefficient on the Reynolds number can be approximated in the logarithmic function. When the curvature parameter, the aspect ratio, and the solidity represented forms of the wind turbine are same, the wind turbine performance can be successfully explained by an semi-empirical formula including simple analytical functions, namely, the mean torque and the mean power coefficients can be represented well by the logarithmic functions of the Reynolds number and quadratic or cubic function of the tip speed ratio. The proposed approximate equations successfully predict experimental data for the particularly higher tip speed ratio. |
| first_indexed | 2024-04-11T17:06:25Z |
| format | Article |
| id | doaj.art-ebd066e792af4955b2f93783be9e4140 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-11T17:06:25Z |
| publishDate | 2016-08-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-ebd066e792af4955b2f93783be9e41402022-12-22T04:13:01ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582016-08-01113JFST0014JFST001410.1299/jfst.2016jfst0014jfstEffect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbineSeiji YAMADA0Tomohiro TAMURA1Shinsuke MOCHIZUKI2Yamaguchi Prefectural Industrial Technology InstituteYamaguchi Prefectural Industrial Technology InstituteGraduate School of Science and Engineering, Yamaguchi UniversityEffect of the Reynolds number on the torque and power characteristics of a small straight-bladed vertical axis wind turbine has been investigated experimentally under various wind velocity. The maximum mean torque coefficient and the maximum mean power coefficient increase with increasing the Reynolds number based on the wind velocity and representative length of the wind turbine, and the dependence of these coefficients on the Reynolds number can be successfully approximated in the logarithmic function. The tip speed ratio for the maximum mean torque coefficient is almost independent of the Reynolds number. Otherwise, the tip speed ratio for the maximum power coefficient increases as increasing Reynolds number, and the dependence of the maximum mean torque coefficient on the Reynolds number can be approximated in the logarithmic function. When the curvature parameter, the aspect ratio, and the solidity represented forms of the wind turbine are same, the wind turbine performance can be successfully explained by an semi-empirical formula including simple analytical functions, namely, the mean torque and the mean power coefficients can be represented well by the logarithmic functions of the Reynolds number and quadratic or cubic function of the tip speed ratio. The proposed approximate equations successfully predict experimental data for the particularly higher tip speed ratio.https://www.jstage.jst.go.jp/article/jfst/11/3/11_2016jfst0014/_pdf/-char/enwind turbinevertical axisstraight bladereynolds numbertip speed ratioperformancetorquepowerapproximate modeling |
| spellingShingle | Seiji YAMADA Tomohiro TAMURA Shinsuke MOCHIZUKI Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine Journal of Fluid Science and Technology wind turbine vertical axis straight blade reynolds number tip speed ratio performance torque power approximate modeling |
| title | Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine |
| title_full | Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine |
| title_fullStr | Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine |
| title_full_unstemmed | Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine |
| title_short | Effect of the Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine |
| title_sort | effect of the reynolds number on the performance and approximate modeling of the small straight bladed vertical axis wind turbine |
| topic | wind turbine vertical axis straight blade reynolds number tip speed ratio performance torque power approximate modeling |
| url | https://www.jstage.jst.go.jp/article/jfst/11/3/11_2016jfst0014/_pdf/-char/en |
| work_keys_str_mv | AT seijiyamada effectofthereynoldsnumberontheperformanceandapproximatemodelingofthesmallstraightbladedverticalaxiswindturbine AT tomohirotamura effectofthereynoldsnumberontheperformanceandapproximatemodelingofthesmallstraightbladedverticalaxiswindturbine AT shinsukemochizuki effectofthereynoldsnumberontheperformanceandapproximatemodelingofthesmallstraightbladedverticalaxiswindturbine |