Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis
This research examines the optimal 3D geometric parameters and shape of empty diffusers to enhance the mass flow rate of the HAWT rotor plane using a detailed parametric study. Previous works have investigated the use of diffusers to augment turbine power output; however, different curvature surface...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844024028135 |
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| author | Debela Alema Teklemariyem Eshetu Tadesse Yimer Venkata Rammaya Ancha Balewgize Amare Zeru |
| author_facet | Debela Alema Teklemariyem Eshetu Tadesse Yimer Venkata Rammaya Ancha Balewgize Amare Zeru |
| author_sort | Debela Alema Teklemariyem |
| collection | DOAJ |
| description | This research examines the optimal 3D geometric parameters and shape of empty diffusers to enhance the mass flow rate of the HAWT rotor plane using a detailed parametric study. Previous works have investigated the use of diffusers to augment turbine power output; however, different curvature surfaces and the effects of all associated angles have not been considered for a thorough evaluation. This work mainly focuses on analyzing the effect of opening angles (2° to 22°), inlet shroud angles (8° to 24°), flange height ratios, flange angles (0° and 15°), and shape of the diffuser as well as flanges on velocity, pressure at the diffuser entry, and through the diffuser section at a wind speed of 4.5 m/s. At an inlet-shroud angle of 24° and an opening angle of 8°, with a diffuser flange height-throat diameter ratio of 0.3, the system achieved an 82.9% increase in flowrate. The diffuser with an inlet shroud-side lower stepped flange showed an optimum velocity of 9.12 m/s (maximum) and 8.2 m/s (average), resulting in a 102.66% and 82.2% increase in velocity, respectively. The percentage increase in velocity of the present study is 92.61%, compared with the previous maximum increase in rate of 53.8%, and then an increase in velocity of 38.81% was obtained. The optimum speed occurred at 0.175 m from the inlet section of the diffuser, indicating where the turbine should best be located. The CFD results from this work were validated with experimental data from the literature, showing a good agreement between the two. Integrated diffuser-turbine system simulation and experimental work with field tests are recommended as a way forward. |
| first_indexed | 2024-03-07T18:36:39Z |
| format | Article |
| id | doaj.art-e06eb190b0c14784bf705e992162ea13 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-04-24T23:16:43Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-e06eb190b0c14784bf705e992162ea132024-03-17T07:56:15ZengElsevierHeliyon2405-84402024-03-01105e26782Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysisDebela Alema Teklemariyem0Eshetu Tadesse Yimer1Venkata Rammaya Ancha2Balewgize Amare Zeru3Jimma Insitute of Technology, Thermal Energy Systems, P.O.Box 378, Jimma, Ethiopia; Corresponding author.Jimma Insitute of Technology, Thermal Energy Systems, P.O.Box 378, Jimma, EthiopiaJimma Insitute of Technology, Sustainable Energy Engineering, Jimma, EthiopiaJimma Insitute of Technology, Thermal Energy Systems, P.O.Box 378, Jimma, EthiopiaThis research examines the optimal 3D geometric parameters and shape of empty diffusers to enhance the mass flow rate of the HAWT rotor plane using a detailed parametric study. Previous works have investigated the use of diffusers to augment turbine power output; however, different curvature surfaces and the effects of all associated angles have not been considered for a thorough evaluation. This work mainly focuses on analyzing the effect of opening angles (2° to 22°), inlet shroud angles (8° to 24°), flange height ratios, flange angles (0° and 15°), and shape of the diffuser as well as flanges on velocity, pressure at the diffuser entry, and through the diffuser section at a wind speed of 4.5 m/s. At an inlet-shroud angle of 24° and an opening angle of 8°, with a diffuser flange height-throat diameter ratio of 0.3, the system achieved an 82.9% increase in flowrate. The diffuser with an inlet shroud-side lower stepped flange showed an optimum velocity of 9.12 m/s (maximum) and 8.2 m/s (average), resulting in a 102.66% and 82.2% increase in velocity, respectively. The percentage increase in velocity of the present study is 92.61%, compared with the previous maximum increase in rate of 53.8%, and then an increase in velocity of 38.81% was obtained. The optimum speed occurred at 0.175 m from the inlet section of the diffuser, indicating where the turbine should best be located. The CFD results from this work were validated with experimental data from the literature, showing a good agreement between the two. Integrated diffuser-turbine system simulation and experimental work with field tests are recommended as a way forward.http://www.sciencedirect.com/science/article/pii/S2405844024028135Wind energyHAWT (horizontal axis wind turbine)DAWTFlanged diffuserParametric studyCFD |
| spellingShingle | Debela Alema Teklemariyem Eshetu Tadesse Yimer Venkata Rammaya Ancha Balewgize Amare Zeru Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis Heliyon Wind energy HAWT (horizontal axis wind turbine) DAWT Flanged diffuser Parametric study CFD |
| title | Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis |
| title_full | Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis |
| title_fullStr | Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis |
| title_full_unstemmed | Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis |
| title_short | Parametric study of an empty diffuser geometric parameters and shape for a wind turbine using CFD analysis |
| title_sort | parametric study of an empty diffuser geometric parameters and shape for a wind turbine using cfd analysis |
| topic | Wind energy HAWT (horizontal axis wind turbine) DAWT Flanged diffuser Parametric study CFD |
| url | http://www.sciencedirect.com/science/article/pii/S2405844024028135 |
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