Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine
The Savonius hydrokinetic turbine is a viable alternative for rural electrification despite its relatively low power coefficient. There are many ways to improve power performance, including the use of multiple-stage turbines. Although many studies have investigated the effects of multi-staging, few...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123022005242 |
| _version_ | 1797991982615756800 |
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| author | M.S. M. Shamsuddin Noorfazreena M. Kamaruddin |
| author_facet | M.S. M. Shamsuddin Noorfazreena M. Kamaruddin |
| author_sort | M.S. M. Shamsuddin |
| collection | DOAJ |
| description | The Savonius hydrokinetic turbine is a viable alternative for rural electrification despite its relatively low power coefficient. There are many ways to improve power performance, including the use of multiple-stage turbines. Although many studies have investigated the effects of multi-staging, few have captured their effect on three performance parameters combined: power efficiency, flow structure, and self-starting capability. Therefore, the current study explored and analyzed the extent of these parameters using a multi-stage conventional Savonius turbine in a wind tunnel facility with a varying flow speed of 5 m/s to 9 m/s. The findings suggested that adding a stage increased the power coefficient to a maximum of 138% at 5 m/s, but reached a plateau as the wind speed increased to 9 m/s. The double-stage was discovered to reduce the self-starting speed of the turbine at all rotor angles for self-starting capabilities. The coefficient of static torque results indicated that the maximum static torque for the single and double-stage configurations occurred at 45° and 45°/135° rotor angles, respectively. The qualitative study revealed that the double-stage turbine has a larger wake size at higher wind speeds, resulting in a reduced wake intensity at the rear side of the rotor. The reduced torque variation caused by the additional stage has improved the overall performance of the turbine, making the double-stage configuration more preferable than the single-stage, particularly for low speed, high depth, and narrow river applications. |
| first_indexed | 2024-04-11T09:00:42Z |
| format | Article |
| id | doaj.art-a39b09a3f1f14f39a7a0df5fcbd0d660 |
| institution | Directory Open Access Journal |
| issn | 2590-1230 |
| language | English |
| last_indexed | 2024-04-11T09:00:42Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj.art-a39b09a3f1f14f39a7a0df5fcbd0d6602022-12-22T04:32:47ZengElsevierResults in Engineering2590-12302023-03-0117100854Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbineM.S. M. Shamsuddin0Noorfazreena M. Kamaruddin1School of Aerospace Engineering, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, MalaysiaCorresponding author.; School of Aerospace Engineering, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, MalaysiaThe Savonius hydrokinetic turbine is a viable alternative for rural electrification despite its relatively low power coefficient. There are many ways to improve power performance, including the use of multiple-stage turbines. Although many studies have investigated the effects of multi-staging, few have captured their effect on three performance parameters combined: power efficiency, flow structure, and self-starting capability. Therefore, the current study explored and analyzed the extent of these parameters using a multi-stage conventional Savonius turbine in a wind tunnel facility with a varying flow speed of 5 m/s to 9 m/s. The findings suggested that adding a stage increased the power coefficient to a maximum of 138% at 5 m/s, but reached a plateau as the wind speed increased to 9 m/s. The double-stage was discovered to reduce the self-starting speed of the turbine at all rotor angles for self-starting capabilities. The coefficient of static torque results indicated that the maximum static torque for the single and double-stage configurations occurred at 45° and 45°/135° rotor angles, respectively. The qualitative study revealed that the double-stage turbine has a larger wake size at higher wind speeds, resulting in a reduced wake intensity at the rear side of the rotor. The reduced torque variation caused by the additional stage has improved the overall performance of the turbine, making the double-stage configuration more preferable than the single-stage, particularly for low speed, high depth, and narrow river applications.http://www.sciencedirect.com/science/article/pii/S2590123022005242Multi-stageSavonius turbinePower coefficientFlow visualizationSelf-start |
| spellingShingle | M.S. M. Shamsuddin Noorfazreena M. Kamaruddin Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine Results in Engineering Multi-stage Savonius turbine Power coefficient Flow visualization Self-start |
| title | Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine |
| title_full | Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine |
| title_fullStr | Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine |
| title_full_unstemmed | Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine |
| title_short | Experimental study on the characterization of the self-starting capability of a single and double-stage Savonius turbine |
| title_sort | experimental study on the characterization of the self starting capability of a single and double stage savonius turbine |
| topic | Multi-stage Savonius turbine Power coefficient Flow visualization Self-start |
| url | http://www.sciencedirect.com/science/article/pii/S2590123022005242 |
| work_keys_str_mv | AT msmshamsuddin experimentalstudyonthecharacterizationoftheselfstartingcapabilityofasingleanddoublestagesavoniusturbine AT noorfazreenamkamaruddin experimentalstudyonthecharacterizationoftheselfstartingcapabilityofasingleanddoublestagesavoniusturbine |