Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study
This research proposes a novel model, whose implementation is examined via an analytical study with practically verified results, with an objective to improve the performance of horizontal axis wind turbines joined with a round diffuser. Helical grooves were proposed to be added to the shrouded and...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202725002460 |
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| author | Ra'ad K Mohammed Aldulaimi Nabeel Sameer Mahmoud |
| author_facet | Ra'ad K Mohammed Aldulaimi Nabeel Sameer Mahmoud |
| author_sort | Ra'ad K Mohammed Aldulaimi |
| collection | DOAJ |
| description | This research proposes a novel model, whose implementation is examined via an analytical study with practically verified results, with an objective to improve the performance of horizontal axis wind turbines joined with a round diffuser. Helical grooves were proposed to be added to the shrouded and augmented diffuser. This design could strengthen the circumferential air vortex and activate stagnation or weak zones located downstream of the air flow. The spiral grooves in the new design direct the surrounding air flow to achieve these effects. This causes a pressure decline inside the diffuser, which subsequently withdraws more flow to the diffuser and increases the extracted power.Three models of helical grooved diffuser-augmented wind turbines (HDAWT) were investigated with various helical angles (θ) (15°, 30°, and 45°), and their performances were compared with an augmented diffuser wind turbine (DAWT) and a plain diffuser wind turbine (DWT), each one tested under five low free stream wind velocities Vo (1, 2, 3, 4, 5 m/s). Investigation results revealed that the highest rotational speed and highest extracted power were obtained using the HDAWT model, with a helical angle of 45°, demonstrating an increase in the power of the improved model by 93.4 %% over the DAWT model and an increase of 118.4 % over the DWT model at Vo equal (5 m/s) .The numerical outcomes provide valuable insights related to the flow technique downstream of the wind turbine considering various models developed in this research. |
| format | Article |
| id | doaj-art-7b03f8a69f844c64904e8bc726b85985 |
| institution | OA Journals |
| issn | 2666-2027 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj-art-7b03f8a69f844c64904e8bc726b859852025-08-20T02:07:35ZengElsevierInternational Journal of Thermofluids2666-20272025-07-012810129910.1016/j.ijft.2025.101299Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical studyRa'ad K Mohammed Aldulaimi0Nabeel Sameer Mahmoud1Department of Mechanical Engineering, Al-Nahrain University, Baghdad, Iraq; Corresponding author.Department of Mechanical Engineering, University of Technology, IraqThis research proposes a novel model, whose implementation is examined via an analytical study with practically verified results, with an objective to improve the performance of horizontal axis wind turbines joined with a round diffuser. Helical grooves were proposed to be added to the shrouded and augmented diffuser. This design could strengthen the circumferential air vortex and activate stagnation or weak zones located downstream of the air flow. The spiral grooves in the new design direct the surrounding air flow to achieve these effects. This causes a pressure decline inside the diffuser, which subsequently withdraws more flow to the diffuser and increases the extracted power.Three models of helical grooved diffuser-augmented wind turbines (HDAWT) were investigated with various helical angles (θ) (15°, 30°, and 45°), and their performances were compared with an augmented diffuser wind turbine (DAWT) and a plain diffuser wind turbine (DWT), each one tested under five low free stream wind velocities Vo (1, 2, 3, 4, 5 m/s). Investigation results revealed that the highest rotational speed and highest extracted power were obtained using the HDAWT model, with a helical angle of 45°, demonstrating an increase in the power of the improved model by 93.4 %% over the DAWT model and an increase of 118.4 % over the DWT model at Vo equal (5 m/s) .The numerical outcomes provide valuable insights related to the flow technique downstream of the wind turbine considering various models developed in this research.http://www.sciencedirect.com/science/article/pii/S2666202725002460Shrouded wind turbineGrooved diffuserEfficient utilizationExtracted powerComputational fluid dynamics (CFD) |
| spellingShingle | Ra'ad K Mohammed Aldulaimi Nabeel Sameer Mahmoud Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study International Journal of Thermofluids Shrouded wind turbine Grooved diffuser Efficient utilization Extracted power Computational fluid dynamics (CFD) |
| title | Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study |
| title_full | Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study |
| title_fullStr | Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study |
| title_full_unstemmed | Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study |
| title_short | Innovative shrouded wind turbine with helical grooved diffuser for low wind speeds: An experimental and numerical study |
| title_sort | innovative shrouded wind turbine with helical grooved diffuser for low wind speeds an experimental and numerical study |
| topic | Shrouded wind turbine Grooved diffuser Efficient utilization Extracted power Computational fluid dynamics (CFD) |
| url | http://www.sciencedirect.com/science/article/pii/S2666202725002460 |
| work_keys_str_mv | AT raadkmohammedaldulaimi innovativeshroudedwindturbinewithhelicalgrooveddiffuserforlowwindspeedsanexperimentalandnumericalstudy AT nabeelsameermahmoud innovativeshroudedwindturbinewithhelicalgrooveddiffuserforlowwindspeedsanexperimentalandnumericalstudy |