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A Twin Impulse Turbine for Wave Energy Conversion
M M Ashraful Alam,Hideki Sato,Manabu Takao,Shinya Okuhara,Toshiaki Setoguchi 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.4
A twin unidirectional impulse turbine for wave energy conversion has been suggested in our previous study, and the performance under unsteady flow has been investigated by quasi-steady analysis. In the present study, the performance of twin impulse turbine under unsteady flow condition has been investigated by unsteady analysis of Computational fluid dynamics. As a result, the mean efficiency of twin unidirectional impulse turbine under unsteady flow is lower than the maximum efficiency of unidirectional impulse turbine. Moreover, it is verified that airflow goes backward in the reverse turbine in low flow rates.
A Twin Impulse Turbine for Wave Energy Conversion -The Performance under Unsteady Airflow-
Alam, M M Ashraful,Sato, Hideki,Takao, Manabu,Okuhara, Shinya,Setoguchi, Toshiaki Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.4
A twin unidirectional impulse turbine for wave energy conversion has been suggested in our previous study, and the performance under unsteady flow has been investigated by quasi-steady analysis. In the present study, the performance of twin impulse turbine under unsteady flow condition has been investigated by unsteady analysis of Computational fluid dynamics. As a result, the mean efficiency of twin unidirectional impulse turbine under unsteady flow is lower than the maximum efficiency of unidirectional impulse turbine. Moreover, it is verified that airflow goes backward in the reverse turbine in low flow rates.
Wells Turbine for Wave Energy Conversion -Effect of Trailing Edge Shape-
Takasaki, Katsuya,Tsunematsu, Tomohiro,Takao, Manabu,Alam, M M Ashraful,Setoguchi, Toshiaki Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.4
The present study reported of the use of special shaped blade to reduce the difference in pressure across the Wells turbine for wave energy conversion. The blade profile was composed of NACA0020 airfoils and trailing edge was notched like chevron. Experiments were performed investigating the influence of trailing edge shape on the turbine performance. Four notch depths were used to investigate the effect of depth of cut on the turbine performance. As results, by placing a notch-cut at the trailing edge of the blade, it was possible to reduce the pressure difference across the turbine without lowering the efficiency. In addition, the pressure difference substantially reduced at a constant rate with the increase of the cut ratio.
A comparative study of bi-directional airflow turbines
Manabu Takao,Seisuke Fukuma,Shinya Okuhara,M. M. Ashraful Alam,Yoichi Kinoue 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.3
In an oscillating water column (OWC) based wave energy plant, a bi-directional airflow is generated in the air chamber. To harness energy, the bi-directional airflow turbines that rotate in the same direction are used in such wave energy conversion devices. Till date, some turbines for bi-directional airflow have been proposed, and their performance were investigated by wind tunnel tests and CFD analyses. Some of the typical turbines have inherent disadvantages, such as severe stall problem and low efficiency. Therefore, authors proposed two unique turbines for bi-directional flow: Wells turbine with booster and counter-rotating impulse turbine. An extensive computational work was conducted to perform a comparative study between the conventional and proposed turbines for bi-directional airflow.
Wells Turbine for Wave Energy Conversion
Katsuya Takasaki,Tomohiro Tsunematsu,Manabu Takao,M M Ashraful Alam,Toshiaki Setoguchi 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.4
The present study reported of the use of special shaped blade to reduce the difference in pressure across the Wells turbine for wave energy conversion. The blade profile was composed of NACA0020 airfoils and trailing edge was notched like chevron. Experiments were performed investigating the influence of trailing edge shape on the turbine performance. Four notch depths were used to investigate the effect of depth of cut on the turbine performance. As results, by placing a notch-cut at the trailing edge of the blade, it was possible to reduce the pressure difference across the turbine without lowering the efficiency. In addition, the pressure difference substantially reduced at a constant rate with the increase of the cut ratio.