Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications
A vertical axis drag-based turbine is proposed that allows for an improved performance by feathering its blades during recovery strokes to eliminate adverse blade forces. The turbine blades resemble flat plates and pitch by 90<inline-formula> <math display="inline"> <semanti...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-11-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/11/12/3328 |
| _version_ | 1798005203689013248 |
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| author | Jubilee Prasad Rao Francisco J. Diez |
| author_facet | Jubilee Prasad Rao Francisco J. Diez |
| author_sort | Jubilee Prasad Rao |
| collection | DOAJ |
| description | A vertical axis drag-based turbine is proposed that allows for an improved performance by feathering its blades during recovery strokes to eliminate adverse blade forces. The turbine blades resemble flat plates and pitch by 90<inline-formula> <math display="inline"> <semantics> <msup> <mrow></mrow> <mo>∘</mo> </msup> </semantics> </math> </inline-formula> between the two turbine strokes using a novel dual-cam mechanism. This passive mechanism orients the blades vertically during the drive stroke for maximum effective area and horizontally for minimum effective area during the recovery stroke. This allows maximizing the positive drive stroke force and minimizing the recovery stroke losses, in turn maximizing the net energy capture and the turbine performance. It is called the cyclic pitch turbine, and a mathematical model is developed that predicts the turbine performance. It shows that the turbine is self-starting for all orientations and has a higher and more uniform static torque coefficient than the popular Savonius turbine. The dynamic analysis also indicates a higher performance, and the predicted values for torque and power coefficients match very closely with those from water channel and wind tunnel experiments on a prototype. Results of testing several blade shapes indicate that airfoil section blades with long and narrow continuous shapes that have less area towards the blade’s tip result in higher performance. |
| first_indexed | 2024-04-11T12:36:34Z |
| format | Article |
| id | doaj.art-49236bb9c4054e2f8edc90ddf54c776f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T12:36:34Z |
| publishDate | 2018-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-49236bb9c4054e2f8edc90ddf54c776f2022-12-22T04:23:37ZengMDPI AGEnergies1996-10732018-11-011112332810.3390/en11123328en11123328Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine ApplicationsJubilee Prasad Rao0Francisco J. Diez1Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ 08901, USADepartment of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ 08901, USAA vertical axis drag-based turbine is proposed that allows for an improved performance by feathering its blades during recovery strokes to eliminate adverse blade forces. The turbine blades resemble flat plates and pitch by 90<inline-formula> <math display="inline"> <semantics> <msup> <mrow></mrow> <mo>∘</mo> </msup> </semantics> </math> </inline-formula> between the two turbine strokes using a novel dual-cam mechanism. This passive mechanism orients the blades vertically during the drive stroke for maximum effective area and horizontally for minimum effective area during the recovery stroke. This allows maximizing the positive drive stroke force and minimizing the recovery stroke losses, in turn maximizing the net energy capture and the turbine performance. It is called the cyclic pitch turbine, and a mathematical model is developed that predicts the turbine performance. It shows that the turbine is self-starting for all orientations and has a higher and more uniform static torque coefficient than the popular Savonius turbine. The dynamic analysis also indicates a higher performance, and the predicted values for torque and power coefficients match very closely with those from water channel and wind tunnel experiments on a prototype. Results of testing several blade shapes indicate that airfoil section blades with long and narrow continuous shapes that have less area towards the blade’s tip result in higher performance.https://www.mdpi.com/1996-1073/11/12/3328cyclic blade pitchingvertical axis wind turbinesdrag-based wind turbinesrecovery stroke dragpower performance testingwind tunnelsmathematical modeling |
| spellingShingle | Jubilee Prasad Rao Francisco J. Diez Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications Energies cyclic blade pitching vertical axis wind turbines drag-based wind turbines recovery stroke drag power performance testing wind tunnels mathematical modeling |
| title | Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications |
| title_full | Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications |
| title_fullStr | Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications |
| title_full_unstemmed | Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications |
| title_short | Novel Cyclic Blade Pitching Mechanism for Wind and Tidal Energy Turbine Applications |
| title_sort | novel cyclic blade pitching mechanism for wind and tidal energy turbine applications |
| topic | cyclic blade pitching vertical axis wind turbines drag-based wind turbines recovery stroke drag power performance testing wind tunnels mathematical modeling |
| url | https://www.mdpi.com/1996-1073/11/12/3328 |
| work_keys_str_mv | AT jubileeprasadrao novelcyclicbladepitchingmechanismforwindandtidalenergyturbineapplications AT franciscojdiez novelcyclicbladepitchingmechanismforwindandtidalenergyturbineapplications |