Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct
A brimmed-diffuser augmented turbine (called a wind lens turbine: WLT) actively uses vortices around the brim to enhance its power output. However, the vortices are usually unstable and asymmetric. This study attempted to stabilize the vortices to enhance the power output of a WLT. Then, we investig...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-08-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/12/16/3171 |
| _version_ | 1798034677657763840 |
|---|---|
| author | Koichi Watanabe Yuji Ohya Takanori Uchida |
| author_facet | Koichi Watanabe Yuji Ohya Takanori Uchida |
| author_sort | Koichi Watanabe |
| collection | DOAJ |
| description | A brimmed-diffuser augmented turbine (called a wind lens turbine: WLT) actively uses vortices around the brim to enhance its power output. However, the vortices are usually unstable and asymmetric. This study attempted to stabilize the vortices to enhance the power output of a WLT. Then, we investigated new approaches using vortex stabilization plates and polygonal brims in wind tunnel experiments and numerical simulations. Both approaches achieved a 1.5−3.8% increase in power output compared with a standard WLT. Our numerical simulations revealed a periodicity existing in a fluctuating vortex structure on the circular brim. Importantly, vortex stabilization plates and polygonal brims must be the same periodic scale to suppress the vortex fluctuation and stabilize the vortices effectively. In addition, a larger brim tended to enhance the stabilizing effects. We believe that this discovery provides an easy way to increase the power output of existing wind turbines. It is particularly important in light of advances in wind energy technology and the increasing wind energy market. |
| first_indexed | 2024-04-11T20:47:36Z |
| format | Article |
| id | doaj.art-d463c447644240688e7fcded73441d47 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T20:47:36Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d463c447644240688e7fcded73441d472022-12-22T04:03:58ZengMDPI AGEnergies1996-10732019-08-011216317110.3390/en12163171en12163171Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the DuctKoichi Watanabe0Yuji Ohya1Takanori Uchida2Kyushu University Platform of Inter/Transdisciplinary Energy Research (Q-PIT), Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, JapanResearch Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, JapanResearch Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, JapanA brimmed-diffuser augmented turbine (called a wind lens turbine: WLT) actively uses vortices around the brim to enhance its power output. However, the vortices are usually unstable and asymmetric. This study attempted to stabilize the vortices to enhance the power output of a WLT. Then, we investigated new approaches using vortex stabilization plates and polygonal brims in wind tunnel experiments and numerical simulations. Both approaches achieved a 1.5−3.8% increase in power output compared with a standard WLT. Our numerical simulations revealed a periodicity existing in a fluctuating vortex structure on the circular brim. Importantly, vortex stabilization plates and polygonal brims must be the same periodic scale to suppress the vortex fluctuation and stabilize the vortices effectively. In addition, a larger brim tended to enhance the stabilizing effects. We believe that this discovery provides an easy way to increase the power output of existing wind turbines. It is particularly important in light of advances in wind energy technology and the increasing wind energy market.https://www.mdpi.com/1996-1073/12/16/3171brimmed-diffuser augmented wind turbine (B-DAWT)vortex stabilization platespolygonal brimpower enhancement |
| spellingShingle | Koichi Watanabe Yuji Ohya Takanori Uchida Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct Energies brimmed-diffuser augmented wind turbine (B-DAWT) vortex stabilization plates polygonal brim power enhancement |
| title | Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct |
| title_full | Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct |
| title_fullStr | Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct |
| title_full_unstemmed | Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct |
| title_short | Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct |
| title_sort | power output enhancement of a ducted wind turbine by stabilizing vortices around the duct |
| topic | brimmed-diffuser augmented wind turbine (B-DAWT) vortex stabilization plates polygonal brim power enhancement |
| url | https://www.mdpi.com/1996-1073/12/16/3171 |
| work_keys_str_mv | AT koichiwatanabe poweroutputenhancementofaductedwindturbinebystabilizingvorticesaroundtheduct AT yujiohya poweroutputenhancementofaductedwindturbinebystabilizingvorticesaroundtheduct AT takanoriuchida poweroutputenhancementofaductedwindturbinebystabilizingvorticesaroundtheduct |