Experimental Considerations in an Approximate Method for Estimating the Blade Performance of Darrieus-Type Cross-Flow Water Turbines.

Takamatsu, Yasuo; Furukawa, Akinori; Takenouchi, Kazuki; Okuma, Kusuo

doi:10.1299/jsmeb.36.135

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Due to the constantly changing blade attack angle during turbine operation, simply using blade lift and drag characteristics cannot accurately evaluate the performance of the turbine [41]. Modeling the turbine is necessary and accurate modeling of the dynamic stall is important [42,43].…”

Section: Methodsmentioning

confidence: 99%

A Review: Design and Optimization Approaches of the Darrieus Water Turbine

Tan

et al. 2023

Sustainability

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As the use of Darrieus turbines in water is becoming increasingly popular in the field of renewable energy, it is essential to explore and evaluate existing research efforts. The situation of the Darrieus water turbine in water still requires further discussion. This paper aims to provide a comprehensive review of optimization methods for Darrieus water turbines, addressing the challenges associated with their efficiency, start-up, and stability. This work summarizes and evaluates the findings of previous studies, focusing on the features of experimental and numerical methods. Influence of geometric parameters, including height-diameter ratio, solidity, torsional angle, and airfoil are also talked into. The existing research adopts solidity values ranging from 0.1 to 0.4, but the design experience is not as extensive as that of the Darrieus wind turbine. Further discussions are still needed on the optimal power coefficient and tip speed ratio of the Darrieus water turbine. The research with a power coefficient ranging from about zero to above the Betz limit needs further summarization. Various optimization strategies, such as multi-turbine arrangement, coupling with Savonius turbines, and blade pitching, are also discussed. By offering insights into the current state of optimization works for Darrieus water turbines, this review aims to facilitate future research, bridge existing gaps in the field, further enrich the utilization of ocean currents, and improve the structure of renewable energy.

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Section: Methodsmentioning

confidence: 99%

A Review: Design and Optimization Approaches of the Darrieus Water Turbine

Tan

et al. 2023

Sustainability

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“…Local efficiency η b of Darrieus blade at θ and time averaged one in one revolution are theoretically expressed [7] as follows:…”

Section: Working Principle Of Darrieus Runnermentioning

confidence: 99%

Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with inlet nozzle for extra-low head utilization

Shimokawa

Furukawa

Okuma

et al. 2010

Sci. China Ser. E-Technol. Sci.

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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. hydro turbine, Darrieus-type runner, duct side-wall effect, turbine performance Citation: Shimokawa K, Furukawa A, Okuma K, et al. Side-wall effect of runner casing on performance of Darrieus-type hydro turbine with inlet nozzle for extra-low head utilization. Sci China Tech Sci, 2010, 53: 93−99,

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“…The discussion is on the transformation of flow distribution on the mean line of wing section. Takamatsu et al [17] derived the empirical formula to express the performance of a rotating water turbine blade using the aerodynamic characteristics of the wing obtained in wind tunnel measurements.…”

Section: Introductionmentioning

confidence: 99%