A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser
We developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser, which we called a “wind lens turbine” (WLT), has demonstrated power augmentation by a factor of abou...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/12/3661 |
| _version_ | 1797529466641055744 |
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| author | Koichi Watanabe Yuji Ohya |
| author_facet | Koichi Watanabe Yuji Ohya |
| author_sort | Koichi Watanabe |
| collection | DOAJ |
| description | We developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser, which we called a “wind lens turbine” (WLT), has demonstrated power augmentation by a factor of about 2–5 compared with a bare wind turbine for a given turbine diameter and wind speed. The increase in power output depends on the diffuser shape and length and the brim height. However, a simple theory presented in this paper argues that only two performance coefficients are needed to predict the performance of WLT. The coefficients are the back pressure coefficient of the brim and the pressure recovery coefficient of the diffuser. We theoretically showed that the back pressure coefficient was particularly important for the performance of WLT. Finally, the simple theory was evaluated with experimental results. The results showed good agreement with each other. |
| first_indexed | 2024-03-10T10:15:14Z |
| format | Article |
| id | doaj.art-0e51e2c2ccb548b6979ece26cc8c03e7 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T10:15:14Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-0e51e2c2ccb548b6979ece26cc8c03e72023-11-22T00:52:24ZengMDPI AGEnergies1996-10732021-06-011412366110.3390/en14123661A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed DiffuserKoichi Watanabe0Yuji Ohya1Kyushu University Platform of Inter/Transdisciplinary Energy Research, Kyushu University, Fukuoka 816-8580, JapanResearch Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, JapanWe developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser, which we called a “wind lens turbine” (WLT), has demonstrated power augmentation by a factor of about 2–5 compared with a bare wind turbine for a given turbine diameter and wind speed. The increase in power output depends on the diffuser shape and length and the brim height. However, a simple theory presented in this paper argues that only two performance coefficients are needed to predict the performance of WLT. The coefficients are the back pressure coefficient of the brim and the pressure recovery coefficient of the diffuser. We theoretically showed that the back pressure coefficient was particularly important for the performance of WLT. Finally, the simple theory was evaluated with experimental results. The results showed good agreement with each other.https://www.mdpi.com/1996-1073/14/12/3661diffuser augmented wind turbinebrimwind lens technologysimple theory |
| spellingShingle | Koichi Watanabe Yuji Ohya A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser Energies diffuser augmented wind turbine brim wind lens technology simple theory |
| title | A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser |
| title_full | A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser |
| title_fullStr | A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser |
| title_full_unstemmed | A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser |
| title_short | A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser |
| title_sort | simple theory and performance prediction for a shrouded wind turbine with a brimmed diffuser |
| topic | diffuser augmented wind turbine brim wind lens technology simple theory |
| url | https://www.mdpi.com/1996-1073/14/12/3661 |
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