Bidirectional Impulse Turbine With Spiral Flow Collector for Tidal Energy Conversion

Sakaguchi, Masaki; Kinoue, Yoichi; Hirayama, Koki; Murakami, Tengen; Shiomi, Norimasa; Imai, Yasutaka; Nagata, Shinji; Takao, Manabu

doi:10.1115/1.4052176

Cited by 1 publication

(1 citation statement)

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“…In addition, the turbine-area-based power coefficient C Pt is the highest for DuctC. This trend in different ducts was qualitatively consistent with the results obtained using an impulse turbine by Sakaguchi et al 29 In other words, for both impulse and reaction turbines, a larger maximum duct area ratio is advantageous for fluctuating flows, such as tidal currents, because it allows the turbine to generate power for longer times, even at lower tidal velocities when the TSR is high. Comparing the experimental data of Sun and Kyozuka 20 with the results of DuctC, the DuctC results are approximately half the value of Sun and Kyozuka’s experimental data.…”

Section: Resultssupporting

confidence: 91%

Design method for a bidirectional ducted tidal turbine based on conventional turbomachinery methods

Tsuru

Kinoue

Murakami

et al. 2023

Advances in Mechanical Engineering

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Renewable energy sources include solar, wind, hydro, geothermal and biomass. Furthermore, ocean energy is being rapidly harnessed worldwide. In this study, to establish a suitable design method for various bidirectional ducted tidal turbines, instead of using blade element momentum theory and CFD, which have been used previously, the method used for turbomachinery was used for designing the turbines. A bidirectional turbine optimises the equipment design and reduces manufacturing and maintenance costs. Using the turbine power as the design condition, the difference in the tangential velocity between the front and rear of the turbine was calculated using Euler’s equation, and the blade stagger angle was determined based on the potential flow theory. To incorporate the effect of duct geometry into this design method in the future, the effect on the internal flow of the duct was experimentally investigated using three ducts with different maximum cross-sectional areas. Performance tests showed that the duct geometry had a negligible effect on the flow rate through the turbine. Therefore, the larger the maximum diameter of the duct, the greater the flow rate into the outside of the duct. The pressure difference between front and rear of the turbine and the inflow energy into the duct were different due to the energy conversion as the flow turned outside of the duct. To improve the accuracy of the design method, the effect of flow at the duct inlet and the energy conversion should be incorporated, and a review of the estimation method for the axial velocity ratio and the selection method for the design representative value should be conducted.

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Section: Resultssupporting

confidence: 91%