The Experts below are selected from a list of 8358 Experts worldwide ranked by ideXlab platform
Satoshi Watanabe - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Investigations on Performances of Darriues-type Hydro Turbine with Inlet Nozzle
International Journal of Fluid Machinery and Systems, 2014Co-Authors: Daisuke Matsushita, Kei Tanaka, Satoshi Watanabe, Kusuo Okuma, Akinori FurukawaAbstract:Low head hydropower is one of realistic renewable energies. The Darrieus-type hydro turbine with an Inlet Nozzle is available for such low head conditions because of its simple structure with easy maintenance. Experimental and numerical studies are carried out in order to examine the effects of gap distances between the runner pitch circle and two edges of Inlet Nozzle on turbine performances. By selecting narrower gaps of left and right edges, the performance could be improved. From the results of two dimensional numerical simulations, the relation between the performance and flow behaviors around the Darrieus blade are discussed to obtain the guideline of appropriate Inlet Nozzle design.
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Experimental study on simplification of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head hydropower utilization
Renewable Energy, 2012Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type hydro turbine has been proposed for utilization of extra-low head hydropower less than 2 m. In general, the low head hydro turbine system demands the simple structure to reduce the cost of power generation. The Darrieus-type hydro turbine is cross flow type and takes larger values of generated torque with higher efficiency on the upstream path of the Darrieus blades passing in one revolution. Based on this reason, when a narrow intake at the upstream of the runner, called as “Inlet Nozzle”, is installed, the performance of Darrieus-type hydro turbine becomes higher than that without one. In addition, it is possible to remove the draft tube and side-walls of the runner casing keeping the turbine efficiency high. In the present paper, more simplified runner casing, composed of only the Inlet Nozzle and the small upper-casing, is proposed and the experimental results are shown.
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Experimental Study on Adjustment of Inlet Nozzle Section to Flow Rate Variation for Darrieus-type Hydro-Turbine
International Journal of Fluid Machinery and Systems, 2012Co-Authors: Satoshi Watanabe, Kusuo Okuma, Akinori Furukawa, Kai Shimokawa, Daisuke MatsushitaAbstract:A two dimensional Darrieus-type turbine has been proposed for the hydropower utilization of extra-low head less than 2m. In a practical use of Darrieus-type hydro-turbine, head and flow rate may be varied temporally and seasonally. Considering that the cost advantage is required for the low head hydro turbine system, the Darrieus turbine should be operated with high efficiency in the wider range of flow rate possibly by using an additional device with simpler mechanism. In the present paper, an adjustment of Inlet Nozzle section by lowering the Inlet Nozzle height is proposed to obtain the preferable Inlet velocity in low flow rate conditions. Effects of resulting spanwise partial Inlet flow are investigated. Finally, an effective modification of Inlet Nozzle height over flow rate variation is shown.
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Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head utilization
Science China-technological Sciences, 2010Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type turbine has been proposed for hydropower utilization of extra-low head less than 2 m. Though the hydro turbine system, in general, might consist of an intake, runner casing section and a draft tube for higher efficiency operation, it was clarified in previous experiment that there was no need of the side-walls of runner casing section and a draft-tube for keeping the efficiency high in the case of duct with an Inlet Nozzle. This would yield a simplification of the structure of the turbine system. In order to reconfirm this result for large-sized turbine with 560 mm×300 mm duct, instead of small-sized one with 400 mm×200 mm duct, the side-wall effect on turbine performance was experimentally investigated for three- or four-bladed runner. In the present paper, the experimental results are shown with considering flow behaviors in the runner section.
Kai Shimokawa - One of the best experts on this subject based on the ideXlab platform.
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Experimental study on simplification of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head hydropower utilization
Renewable Energy, 2012Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type hydro turbine has been proposed for utilization of extra-low head hydropower less than 2 m. In general, the low head hydro turbine system demands the simple structure to reduce the cost of power generation. The Darrieus-type hydro turbine is cross flow type and takes larger values of generated torque with higher efficiency on the upstream path of the Darrieus blades passing in one revolution. Based on this reason, when a narrow intake at the upstream of the runner, called as “Inlet Nozzle”, is installed, the performance of Darrieus-type hydro turbine becomes higher than that without one. In addition, it is possible to remove the draft tube and side-walls of the runner casing keeping the turbine efficiency high. In the present paper, more simplified runner casing, composed of only the Inlet Nozzle and the small upper-casing, is proposed and the experimental results are shown.
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Experimental Study on Adjustment of Inlet Nozzle Section to Flow Rate Variation for Darrieus-type Hydro-Turbine
International Journal of Fluid Machinery and Systems, 2012Co-Authors: Satoshi Watanabe, Kusuo Okuma, Akinori Furukawa, Kai Shimokawa, Daisuke MatsushitaAbstract:A two dimensional Darrieus-type turbine has been proposed for the hydropower utilization of extra-low head less than 2m. In a practical use of Darrieus-type hydro-turbine, head and flow rate may be varied temporally and seasonally. Considering that the cost advantage is required for the low head hydro turbine system, the Darrieus turbine should be operated with high efficiency in the wider range of flow rate possibly by using an additional device with simpler mechanism. In the present paper, an adjustment of Inlet Nozzle section by lowering the Inlet Nozzle height is proposed to obtain the preferable Inlet velocity in low flow rate conditions. Effects of resulting spanwise partial Inlet flow are investigated. Finally, an effective modification of Inlet Nozzle height over flow rate variation is shown.
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Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head utilization
Science China-technological Sciences, 2010Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type turbine has been proposed for hydropower utilization of extra-low head less than 2 m. Though the hydro turbine system, in general, might consist of an intake, runner casing section and a draft tube for higher efficiency operation, it was clarified in previous experiment that there was no need of the side-walls of runner casing section and a draft-tube for keeping the efficiency high in the case of duct with an Inlet Nozzle. This would yield a simplification of the structure of the turbine system. In order to reconfirm this result for large-sized turbine with 560 mm×300 mm duct, instead of small-sized one with 400 mm×200 mm duct, the side-wall effect on turbine performance was experimentally investigated for three- or four-bladed runner. In the present paper, the experimental results are shown with considering flow behaviors in the runner section.
Daisuke Matsushita - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Investigations on Performances of Darriues-type Hydro Turbine with Inlet Nozzle
International Journal of Fluid Machinery and Systems, 2014Co-Authors: Daisuke Matsushita, Kei Tanaka, Satoshi Watanabe, Kusuo Okuma, Akinori FurukawaAbstract:Low head hydropower is one of realistic renewable energies. The Darrieus-type hydro turbine with an Inlet Nozzle is available for such low head conditions because of its simple structure with easy maintenance. Experimental and numerical studies are carried out in order to examine the effects of gap distances between the runner pitch circle and two edges of Inlet Nozzle on turbine performances. By selecting narrower gaps of left and right edges, the performance could be improved. From the results of two dimensional numerical simulations, the relation between the performance and flow behaviors around the Darrieus blade are discussed to obtain the guideline of appropriate Inlet Nozzle design.
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Experimental study on simplification of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head hydropower utilization
Renewable Energy, 2012Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type hydro turbine has been proposed for utilization of extra-low head hydropower less than 2 m. In general, the low head hydro turbine system demands the simple structure to reduce the cost of power generation. The Darrieus-type hydro turbine is cross flow type and takes larger values of generated torque with higher efficiency on the upstream path of the Darrieus blades passing in one revolution. Based on this reason, when a narrow intake at the upstream of the runner, called as “Inlet Nozzle”, is installed, the performance of Darrieus-type hydro turbine becomes higher than that without one. In addition, it is possible to remove the draft tube and side-walls of the runner casing keeping the turbine efficiency high. In the present paper, more simplified runner casing, composed of only the Inlet Nozzle and the small upper-casing, is proposed and the experimental results are shown.
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Experimental Study on Adjustment of Inlet Nozzle Section to Flow Rate Variation for Darrieus-type Hydro-Turbine
International Journal of Fluid Machinery and Systems, 2012Co-Authors: Satoshi Watanabe, Kusuo Okuma, Akinori Furukawa, Kai Shimokawa, Daisuke MatsushitaAbstract:A two dimensional Darrieus-type turbine has been proposed for the hydropower utilization of extra-low head less than 2m. In a practical use of Darrieus-type hydro-turbine, head and flow rate may be varied temporally and seasonally. Considering that the cost advantage is required for the low head hydro turbine system, the Darrieus turbine should be operated with high efficiency in the wider range of flow rate possibly by using an additional device with simpler mechanism. In the present paper, an adjustment of Inlet Nozzle section by lowering the Inlet Nozzle height is proposed to obtain the preferable Inlet velocity in low flow rate conditions. Effects of resulting spanwise partial Inlet flow are investigated. Finally, an effective modification of Inlet Nozzle height over flow rate variation is shown.
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Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head utilization
Science China-technological Sciences, 2010Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type turbine has been proposed for hydropower utilization of extra-low head less than 2 m. Though the hydro turbine system, in general, might consist of an intake, runner casing section and a draft tube for higher efficiency operation, it was clarified in previous experiment that there was no need of the side-walls of runner casing section and a draft-tube for keeping the efficiency high in the case of duct with an Inlet Nozzle. This would yield a simplification of the structure of the turbine system. In order to reconfirm this result for large-sized turbine with 560 mm×300 mm duct, instead of small-sized one with 400 mm×200 mm duct, the side-wall effect on turbine performance was experimentally investigated for three- or four-bladed runner. In the present paper, the experimental results are shown with considering flow behaviors in the runner section.
Akinori Furukawa - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Investigations on Performances of Darriues-type Hydro Turbine with Inlet Nozzle
International Journal of Fluid Machinery and Systems, 2014Co-Authors: Daisuke Matsushita, Kei Tanaka, Satoshi Watanabe, Kusuo Okuma, Akinori FurukawaAbstract:Low head hydropower is one of realistic renewable energies. The Darrieus-type hydro turbine with an Inlet Nozzle is available for such low head conditions because of its simple structure with easy maintenance. Experimental and numerical studies are carried out in order to examine the effects of gap distances between the runner pitch circle and two edges of Inlet Nozzle on turbine performances. By selecting narrower gaps of left and right edges, the performance could be improved. From the results of two dimensional numerical simulations, the relation between the performance and flow behaviors around the Darrieus blade are discussed to obtain the guideline of appropriate Inlet Nozzle design.
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Experimental study on simplification of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head hydropower utilization
Renewable Energy, 2012Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type hydro turbine has been proposed for utilization of extra-low head hydropower less than 2 m. In general, the low head hydro turbine system demands the simple structure to reduce the cost of power generation. The Darrieus-type hydro turbine is cross flow type and takes larger values of generated torque with higher efficiency on the upstream path of the Darrieus blades passing in one revolution. Based on this reason, when a narrow intake at the upstream of the runner, called as “Inlet Nozzle”, is installed, the performance of Darrieus-type hydro turbine becomes higher than that without one. In addition, it is possible to remove the draft tube and side-walls of the runner casing keeping the turbine efficiency high. In the present paper, more simplified runner casing, composed of only the Inlet Nozzle and the small upper-casing, is proposed and the experimental results are shown.
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Experimental Study on Adjustment of Inlet Nozzle Section to Flow Rate Variation for Darrieus-type Hydro-Turbine
International Journal of Fluid Machinery and Systems, 2012Co-Authors: Satoshi Watanabe, Kusuo Okuma, Akinori Furukawa, Kai Shimokawa, Daisuke MatsushitaAbstract:A two dimensional Darrieus-type turbine has been proposed for the hydropower utilization of extra-low head less than 2m. In a practical use of Darrieus-type hydro-turbine, head and flow rate may be varied temporally and seasonally. Considering that the cost advantage is required for the low head hydro turbine system, the Darrieus turbine should be operated with high efficiency in the wider range of flow rate possibly by using an additional device with simpler mechanism. In the present paper, an adjustment of Inlet Nozzle section by lowering the Inlet Nozzle height is proposed to obtain the preferable Inlet velocity in low flow rate conditions. Effects of resulting spanwise partial Inlet flow are investigated. Finally, an effective modification of Inlet Nozzle height over flow rate variation is shown.
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Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head utilization
Science China-technological Sciences, 2010Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type turbine has been proposed for hydropower utilization of extra-low head less than 2 m. Though the hydro turbine system, in general, might consist of an intake, runner casing section and a draft tube for higher efficiency operation, it was clarified in previous experiment that there was no need of the side-walls of runner casing section and a draft-tube for keeping the efficiency high in the case of duct with an Inlet Nozzle. This would yield a simplification of the structure of the turbine system. In order to reconfirm this result for large-sized turbine with 560 mm×300 mm duct, instead of small-sized one with 400 mm×200 mm duct, the side-wall effect on turbine performance was experimentally investigated for three- or four-bladed runner. In the present paper, the experimental results are shown with considering flow behaviors in the runner section.
Kusuo Okuma - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Investigations on Performances of Darriues-type Hydro Turbine with Inlet Nozzle
International Journal of Fluid Machinery and Systems, 2014Co-Authors: Daisuke Matsushita, Kei Tanaka, Satoshi Watanabe, Kusuo Okuma, Akinori FurukawaAbstract:Low head hydropower is one of realistic renewable energies. The Darrieus-type hydro turbine with an Inlet Nozzle is available for such low head conditions because of its simple structure with easy maintenance. Experimental and numerical studies are carried out in order to examine the effects of gap distances between the runner pitch circle and two edges of Inlet Nozzle on turbine performances. By selecting narrower gaps of left and right edges, the performance could be improved. From the results of two dimensional numerical simulations, the relation between the performance and flow behaviors around the Darrieus blade are discussed to obtain the guideline of appropriate Inlet Nozzle design.
-
Experimental study on simplification of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head hydropower utilization
Renewable Energy, 2012Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type hydro turbine has been proposed for utilization of extra-low head hydropower less than 2 m. In general, the low head hydro turbine system demands the simple structure to reduce the cost of power generation. The Darrieus-type hydro turbine is cross flow type and takes larger values of generated torque with higher efficiency on the upstream path of the Darrieus blades passing in one revolution. Based on this reason, when a narrow intake at the upstream of the runner, called as “Inlet Nozzle”, is installed, the performance of Darrieus-type hydro turbine becomes higher than that without one. In addition, it is possible to remove the draft tube and side-walls of the runner casing keeping the turbine efficiency high. In the present paper, more simplified runner casing, composed of only the Inlet Nozzle and the small upper-casing, is proposed and the experimental results are shown.
-
Experimental Study on Adjustment of Inlet Nozzle Section to Flow Rate Variation for Darrieus-type Hydro-Turbine
International Journal of Fluid Machinery and Systems, 2012Co-Authors: Satoshi Watanabe, Kusuo Okuma, Akinori Furukawa, Kai Shimokawa, Daisuke MatsushitaAbstract:A two dimensional Darrieus-type turbine has been proposed for the hydropower utilization of extra-low head less than 2m. In a practical use of Darrieus-type hydro-turbine, head and flow rate may be varied temporally and seasonally. Considering that the cost advantage is required for the low head hydro turbine system, the Darrieus turbine should be operated with high efficiency in the wider range of flow rate possibly by using an additional device with simpler mechanism. In the present paper, an adjustment of Inlet Nozzle section by lowering the Inlet Nozzle height is proposed to obtain the preferable Inlet velocity in low flow rate conditions. Effects of resulting spanwise partial Inlet flow are investigated. Finally, an effective modification of Inlet Nozzle height over flow rate variation is shown.
-
Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with Inlet Nozzle for extra-low head utilization
Science China-technological Sciences, 2010Co-Authors: Kai Shimokawa, Daisuke Matsushita, Kusuo Okuma, Akinori Furukawa, Satoshi WatanabeAbstract:A ducted Darrieus-type turbine has been proposed for hydropower utilization of extra-low head less than 2 m. Though the hydro turbine system, in general, might consist of an intake, runner casing section and a draft tube for higher efficiency operation, it was clarified in previous experiment that there was no need of the side-walls of runner casing section and a draft-tube for keeping the efficiency high in the case of duct with an Inlet Nozzle. This would yield a simplification of the structure of the turbine system. In order to reconfirm this result for large-sized turbine with 560 mm×300 mm duct, instead of small-sized one with 400 mm×200 mm duct, the side-wall effect on turbine performance was experimentally investigated for three- or four-bladed runner. In the present paper, the experimental results are shown with considering flow behaviors in the runner section.