Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping
Savonius-like-hydrokinetic turbine (SLHT) is a revelation for small-scale (micro/pico) power generation from perennial rivers at low water velocities and low tip speed conditions. However, for its operation at such sites, efficiency is to be improved by design modifications and flow control. This wo...
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Isfahan University of Technology
2025-02-01
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| Series: | Journal of Applied Fluid Mechanics |
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| Online Access: | https://www.jafmonline.net/article_2605_3f065c00086eee73e4632d6765275636.pdf |
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| author | K. C. Sarma B. Nath A. Biswas R. D. Misra |
| author_facet | K. C. Sarma B. Nath A. Biswas R. D. Misra |
| author_sort | K. C. Sarma |
| collection | DOAJ |
| description | Savonius-like-hydrokinetic turbine (SLHT) is a revelation for small-scale (micro/pico) power generation from perennial rivers at low water velocities and low tip speed conditions. However, for its operation at such sites, efficiency is to be improved by design modifications and flow control. This work entails a flow control strategy that combines the mean flow with overlapping flow, gap flow between stages, and flow between end plates. Here, the performance of a two-bladed two stage SLHT with end plates and 15% blade overlapping is examined in a water channel with stage gaps in mm (0-20), low water velocities in m/s (0.45-0.65) under applied braking loads in g (100-1500). The results demonstrate that SLHT produces more power and torque under a low-stage gap as the brake load rises, reaching the highest hydrodynamic torque (0.056 Nm) during a maximum load of 1250 g. The minimal stage gap is 5 mm, turbine braking loading 1250 g, 0.248 TSR, and 0.55 m/s water velocity yield the highest power coefficient (0.058), which is greater than some published SLHT designs. Thus, as much as blade profile modifications, flow control through SLHT can be the future direction for further improvement of its performance. |
| format | Article |
| id | doaj-art-0369ca276cd646a68e9ead007694a21a |
| institution | Kabale University |
| issn | 1735-3572 1735-3645 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj-art-0369ca276cd646a68e9ead007694a21a2025-02-09T07:16:03ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452025-02-0118490491810.47176/jafm.18.4.29242605Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and OverlappingK. C. Sarma0B. Nath1A. Biswas2R. D. Misra3Department of Mechanical Engineering, National Institute of Technology Silchar, Assam, IndiaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam, IndiaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam, IndiaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam, IndiaSavonius-like-hydrokinetic turbine (SLHT) is a revelation for small-scale (micro/pico) power generation from perennial rivers at low water velocities and low tip speed conditions. However, for its operation at such sites, efficiency is to be improved by design modifications and flow control. This work entails a flow control strategy that combines the mean flow with overlapping flow, gap flow between stages, and flow between end plates. Here, the performance of a two-bladed two stage SLHT with end plates and 15% blade overlapping is examined in a water channel with stage gaps in mm (0-20), low water velocities in m/s (0.45-0.65) under applied braking loads in g (100-1500). The results demonstrate that SLHT produces more power and torque under a low-stage gap as the brake load rises, reaching the highest hydrodynamic torque (0.056 Nm) during a maximum load of 1250 g. The minimal stage gap is 5 mm, turbine braking loading 1250 g, 0.248 TSR, and 0.55 m/s water velocity yield the highest power coefficient (0.058), which is greater than some published SLHT designs. Thus, as much as blade profile modifications, flow control through SLHT can be the future direction for further improvement of its performance.https://www.jafmonline.net/article_2605_3f065c00086eee73e4632d6765275636.pdfsavonius-like-hydrokinetic turbineturbine loading power coefficienttorque coefficientwater velocitygap between stagesoverlappingend plates |
| spellingShingle | K. C. Sarma B. Nath A. Biswas R. D. Misra Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping Journal of Applied Fluid Mechanics savonius-like-hydrokinetic turbine turbine loading power coefficient torque coefficient water velocity gap between stages overlapping end plates |
| title | Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping |
| title_full | Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping |
| title_fullStr | Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping |
| title_full_unstemmed | Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping |
| title_short | Study of Stage Gap for a 2-bladed 2-stage Savonius-like-hydro-kinetic Turbine Performance Involving End Plates and Overlapping |
| title_sort | study of stage gap for a 2 bladed 2 stage savonius like hydro kinetic turbine performance involving end plates and overlapping |
| topic | savonius-like-hydrokinetic turbine turbine loading power coefficient torque coefficient water velocity gap between stages overlapping end plates |
| url | https://www.jafmonline.net/article_2605_3f065c00086eee73e4632d6765275636.pdf |
| work_keys_str_mv | AT kcsarma studyofstagegapfora2bladed2stagesavoniuslikehydrokineticturbineperformanceinvolvingendplatesandoverlapping AT bnath studyofstagegapfora2bladed2stagesavoniuslikehydrokineticturbineperformanceinvolvingendplatesandoverlapping AT abiswas studyofstagegapfora2bladed2stagesavoniuslikehydrokineticturbineperformanceinvolvingendplatesandoverlapping AT rdmisra studyofstagegapfora2bladed2stagesavoniuslikehydrokineticturbineperformanceinvolvingendplatesandoverlapping |