Optimization of Darrieus Turbines with an Upwind and Downwind Momentum Model

Loth, John L.; Mccoy, H.

doi:10.2514/3.62659

Cited by 42 publications

(9 citation statements)

References 1 publication

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“…These may be divided into momentum, vortex, and finitedifference models. The momentum models use actuator surfaces to approximate wind-turbine effects and subdivide the flow domain into finite numbers of stream-tubes [205][206][207][208][209]. Vortex models simulate the wind-turbine blades and use bounded and distributed vortices [210][211][212][213].…”

Section: Wind Generatormentioning

confidence: 99%

Progress and recent trends in wind energy

Sahin

2004

Progress in Energy and Combustion Science

265

100

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Section: Wind Generatormentioning

confidence: 99%

Progress and recent trends in wind energy

Sahin

2004

Progress in Energy and Combustion Science

265

100

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“…This is an obvious advantage compared to horizontal-axis water turbines (HAWT) in farm installations, even if VAWT cannot yet compete with them in terms of single-turbine efficiency. Theoretical, momentum-based methods based on two-actuator disk models of the cross-flow turbine predict that the Betz-Joukowski limit should be slightly overcome (Loth and McCoy 1983;Newman 1986). Common magnitudes for maximum power coefficients measured in literature are about c p max = 0.35 (Maître et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Darrieus vertical-axis water turbines: deformation and force measurements on bioinspired highly flexible blade profiles

et al. 2020

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The characteristics of the fluid-structure interaction on the flexible blades of a horizontal-axis water turbine are studied; this bioinspired technology features mechanical simplicity, performance and lifetime improvement, and low fish impact risk, all characteristics of a truly sustainable renewable energy exploitation. A surface-tracking method synchronized with force measurements was applied on a surrogate model of single-bladed, vertical-axis water turbine in a water channel. This allows for the characterization of the structural deformations and their link to the hydrodynamic forces, over a large range of turbine designs and operating points. It is shown that the phase angles of the maxima in blade deformation coincide with those of the load maxima on a rigid blade in identical flow conditions. The influence of the turbine's tip/speed ratio on the blade deformation and blade load is investigated. With the chosen blade design, hydrofoil deformation is found to be maximum in the operating points where the performance improvement is maximized (k o = 0.3). With lower values of reduced frequency (corresponding to lower rotation speed), fluid-induced forces dominate the fluid-structure interaction. Conversely, at higher frequencies, structural inertia dominates the interaction, and blade deformation is again reduced. Results suggest that the optimal blade rigidity may depend on the operating point; nevertheless the potential of the flexible-blade design is demonstrated through clear linking of fluid-induced forces and blade deformation in the complex flow conditions of the Darrieus water turbine.

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“…Traditionally, the Actuator Disk Theory [30][31][32][33][34][35] was brought up by Betz in 1919, using the actuator disk and streamtube assumption to estimate the turbine efficiency, and then extended to double multiple streamtube theory (DMS) later on. Another method for turbine analysis is the vortex method [36][37][38][39][40], which estimates the blade vortex from the induction velocity by BEM (blade element momentum theory) and then keeps the circulation conservation to calculate the streak lines and wake flow.…”

Section: Dynamic Analyses Of Helical Water Turbinementioning

confidence: 99%

The Conceptual Design of a Tidal Power Plant in Taiwan

Tsai

Chen

2014

JMSE

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Located on the northwestern of Taiwan, the Matsu archipelago is near mainland China and comprises four islands: Nangan, Beigan, Juguang, and Dongyin. The population of Matsu totals 11,196 and is chiefly concentrated on Nangan and Beigan. From 1971 to 2000, Matsu built five oil-fired power plants with a total installed capacity of 47 MW. However, the emissions and noise generated by the oil-fired power plant has caused damage to Matsu's environment, and the cost of fuel is high due to the long-distance shipping from Taiwan. Developing renewable energy in Matsu has therefore been a fervent topic for the Taiwan government, and tidal power is considered to be of the highest priority due to Matsu's large tidal range (4.29 m in average) and its semidiurnal tide. Moreover, the islands of Nangan and Beigan are composed of granite and have natural harbors, rendering them ideal places for coastal engineering of tidal power plants. This paper begins with a renewable energy reserves assessment in Matsu to determine the amount of tidal energy. Next, a tidal turbine type of the lowest cost is chosen, and then its dynamic characteristic, performance, and related design are analyzed. Finally, the coastal engineering condition was investigated, and a conceptual design for tidal power plant is proposed.

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Optimization of Darrieus Turbines with an Upwind and Downwind Momentum Model

Cited by 42 publications

References 1 publication

Progress and recent trends in wind energy

Progress and recent trends in wind energy

Darrieus vertical-axis water turbines: deformation and force measurements on bioinspired highly flexible blade profiles

The Conceptual Design of a Tidal Power Plant in Taiwan

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