Performance and Flow Field of a Gravitation Vortex Type Water Turbine
A gravitation vortex type water turbine, which mainly comprises a runner and a tank, generates electricity by introducing a flow of water into the tank and using the gravitation vortex generated when the water drains from the bottom of the tank. This water turbine is capable of generating electricit...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2017/2610508 |
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| _version_ | 1832556075036966912 |
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| author | Yasuyuki Nishi Terumi Inagaki |
| author_facet | Yasuyuki Nishi Terumi Inagaki |
| author_sort | Yasuyuki Nishi |
| collection | DOAJ |
| description | A gravitation vortex type water turbine, which mainly comprises a runner and a tank, generates electricity by introducing a flow of water into the tank and using the gravitation vortex generated when the water drains from the bottom of the tank. This water turbine is capable of generating electricity using a low head and a low flow rate with relatively simple structure. However, because its flow field has a free surface, this water turbine is extremely complicated, and thus its relevance to performance for the generation of electricity has not been clarified. This study aims to clarify the performance and flow field of a gravitation vortex type water turbine. We conducted experiments and numerical analysis, taking the free surface into consideration. As a result, the experimental and computational values of the torque, turbine output, turbine efficiency, and effective head agreed with one another. The performance of this water turbine can be predicted by this analysis. It has been shown that when the rotational speed increases at the runner inlet, the forward flow area expands. However, when the air area decreases, the backward flow area also expands. |
| format | Article |
| id | doaj-art-8af9e6edc4e0401182921ded30eea3f5 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-8af9e6edc4e0401182921ded30eea3f52025-02-03T05:46:27ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342017-01-01201710.1155/2017/26105082610508Performance and Flow Field of a Gravitation Vortex Type Water TurbineYasuyuki Nishi0Terumi Inagaki1Department of Mechanical Engineering, Ibaraki University, 4-12-1 Nakanarusawa-cho, Hitachi-shi, Ibaraki 316-8511, JapanDepartment of Mechanical Engineering, Ibaraki University, 4-12-1 Nakanarusawa-cho, Hitachi-shi, Ibaraki 316-8511, JapanA gravitation vortex type water turbine, which mainly comprises a runner and a tank, generates electricity by introducing a flow of water into the tank and using the gravitation vortex generated when the water drains from the bottom of the tank. This water turbine is capable of generating electricity using a low head and a low flow rate with relatively simple structure. However, because its flow field has a free surface, this water turbine is extremely complicated, and thus its relevance to performance for the generation of electricity has not been clarified. This study aims to clarify the performance and flow field of a gravitation vortex type water turbine. We conducted experiments and numerical analysis, taking the free surface into consideration. As a result, the experimental and computational values of the torque, turbine output, turbine efficiency, and effective head agreed with one another. The performance of this water turbine can be predicted by this analysis. It has been shown that when the rotational speed increases at the runner inlet, the forward flow area expands. However, when the air area decreases, the backward flow area also expands.http://dx.doi.org/10.1155/2017/2610508 |
| spellingShingle | Yasuyuki Nishi Terumi Inagaki Performance and Flow Field of a Gravitation Vortex Type Water Turbine International Journal of Rotating Machinery |
| title | Performance and Flow Field of a Gravitation Vortex Type Water Turbine |
| title_full | Performance and Flow Field of a Gravitation Vortex Type Water Turbine |
| title_fullStr | Performance and Flow Field of a Gravitation Vortex Type Water Turbine |
| title_full_unstemmed | Performance and Flow Field of a Gravitation Vortex Type Water Turbine |
| title_short | Performance and Flow Field of a Gravitation Vortex Type Water Turbine |
| title_sort | performance and flow field of a gravitation vortex type water turbine |
| url | http://dx.doi.org/10.1155/2017/2610508 |
| work_keys_str_mv | AT yasuyukinishi performanceandflowfieldofagravitationvortextypewaterturbine AT terumiinagaki performanceandflowfieldofagravitationvortextypewaterturbine |