Simulating variable pitch crossflow water turbines: A coupled unsteady ONERA-EDLIN model and streamtube model

Paillard, Benoît; Hauville, Frédéric; Astolfi, Jacques-André

doi:10.1016/j.renene.2012.10.018

Cited by 18 publications

(9 citation statements)

References 14 publications

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“…The free flow, the relative flow, and the rotational Reynolds numbers, respectively, Re V , Re W and Re U , based on the blade chord ( C ), are given by,

{Re}_{V} = \frac{CV}{ν},

{Re}_{W} = \frac{CW}{ν},

{Re}_{U} = \frac{CU}{ν},

where ν is the water kinematic viscosity.…”

Section: Formulation Of the Performance Parameters And Uncertaintiesmentioning

confidence: 99%

“…The mechanical power ( P t ) generated by the hydro Darrieus turbine, the available power of the water flow ( P w ) passing through this turbine, its torque coefficient ( C t ) and its power coefficient ( C P ) are given respectively by

P_{t} = T_{t} . normalω = T_{t} \frac{2 normalπ N}{60},

P_{w} = 2 normalρ . normalg . b . R . V . H_{ef},

C_{T} = \frac{T_{t}}{normalρ {bR}^{2} V^{2}},

C_{P} = \frac{P_{t}}{P_{w}} = \frac{normalπ {NT}_{t}}{60 ρg {bRVH}_{ef}},

where,…”

Section: Formulation Of the Performance Parameters And Uncertaintiesmentioning

confidence: 99%

“…The mechanical power (P t ) generated by the hydro Darrieus turbine, 14,17 the available power of the water flow (P w ) passing through this turbine, its torque coefficient (C t ) 10 and its power coefficient (C P ) 16 are given respectively by…”

Section: Performance Parametersmentioning

confidence: 99%

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Experimental study on blade pitch angle effect on the performance of a three-bladed vertical-axis Darrieus hydro turbine

et al. 2019

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Summary Because of higher concerns about increasing global warming, energy consumption and reduction of conventional energy resources and growing attention are given to renewable energy and to cross flow turbines such as the Darrieus turbine to harness water energy (water currents, reservoirs, rivers, and oceans). The aim of the experimental investigation presented in this paper is to evaluate the effect of hydro Darrieus turbine blades fixation pitch angle “ig” on its performance. Four main sets of experimental tests were conducted for the same vertical‐axis hydro turbine model (VAHT) with four blade fixation pitch angles (ig = −1.75°, −4.5°, 1.75°, and 4.5°), at various water flow velocities (V = 0.3‐0.64 m/s corresponding to a water free flow Reynolds number of 2.5 × 104 to 4.36 × 104). A comparison between the results of the present work and with those of a previous experimental study for ig = 0° shows that the best performance of the tested turbine is obtained when the blades are set at a pitch angle of 1.75°. In fact, the corresponding optimum mechanical power and power coefficient relative increases are respectively as much as 82% and 67% with respect to ig = 0° at V = 0.37 m/s and as much as 65% and 77% at V = 0.46 m/s. The worst performance is obtained for the negative blades fixation pitch angle of −4.5°; at the water flow velocity of 0.37 m/s, this leads to power, and power coefficient relative decreases respectively about 75% and 81% with respect to the results obtained for ig = 1.75° and respectively about 54% and 68% of those obtained in the previous work for ig = 0°.

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“…The free flow, the relative flow, and the rotational Reynolds numbers, respectively, Re V , Re W and Re U , based on the blade chord ( C ), are given by,

{Re}_{V} = \frac{CV}{ν},

{Re}_{W} = \frac{CW}{ν},

{Re}_{U} = \frac{CU}{ν},

where ν is the water kinematic viscosity.…”

Section: Formulation Of the Performance Parameters And Uncertaintiesmentioning

confidence: 99%

P_{t} = T_{t} . normalω = T_{t} \frac{2 normalπ N}{60},

P_{w} = 2 normalρ . normalg . b . R . V . H_{ef},

C_{T} = \frac{T_{t}}{normalρ {bR}^{2} V^{2}},

C_{P} = \frac{P_{t}}{P_{w}} = \frac{normalπ {NT}_{t}}{60 ρg {bRVH}_{ef}},

where,…”

Section: Formulation Of the Performance Parameters And Uncertaintiesmentioning

confidence: 99%

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Experimental study on blade pitch angle effect on the performance of a three-bladed vertical-axis Darrieus hydro turbine

et al. 2019

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“…Several computational studies analyse power output increase that can be achieved in VACTs by blade pitch control or similar strategies to optimise blade angle of attack over a revolution, see e.g. Hwang et al (2009), Paillard et al (2013 and Xiao et al (2013). The latter use the commercial unsteady RANSE solver Fluent to simulate turbine blades with symmetrical sections and fixed or oscillating flaps at the trailing edge.…”

Section: Viscous-flow Modelsmentioning

confidence: 99%

Hydrodynamic modelling of marine renewable energy devices: A state of the art review

et al. 2015

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a b s t r a c tThis paper reviews key issues in the physical and numerical modelling of marine renewable energy systems, including wave energy devices, current turbines, and offshore wind turbines. The paper starts with an overview of the types of devices considered, and introduces some key studies in marine renewable energy modelling research. The development of new International Towing Tank Conference (ITTC) guidelines for model testing these devices is placed in the context of guidelines developed or under development by other international bodies as well as via research projects. Some particular challenges are introduced in the experimental and numerical modelling and testing of these devices, including the simulation of Power-Take-Off systems (PTOs) for physical models of all devices, approaches for numerical modelling of devices, and the correct modelling of wind load on offshore wind turbines. Finally, issues related to the uncertainty in performance prediction from model test results are discussed.

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“…This produced power partially compensates for the consumed power, so that the mean power needed to actuate the blades during a turbine's revolution is minimal. Paillard et al (2013) incorporate a dynamic stall model into a streamtube model to investigate the performance of a Darrieus turbine with active pitch variation. A maximum increase on the power coefficient of 53% is reported for a sinusoidal pitch variation, when the power consumption required for blade pitching is lower than 1%.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of vertical-axis tidal turbines with sinusoidal pitching blades

Chen

Viola

et al. 2018

Ocean Engineering

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In this paper, numerical simulations are conducted to compare the performances of a fixed-blade verticalaxis turbine (VAT), and a variable pitch VAT whose blades are forced to do sinusoidal pitching. The numerical model is based on the Navier-Stokes equations and shear stress transport (SST) k- turbulence model. At first, the output characteristics of fixed-blade turbines and variable pitch turbines with different amplitude of pitching, including power coefficient, torque coefficient and ripple factors, are compared. Then the hydrodynamic torques, tangential and normal forces on a blade are compared as well. The comparison reveals that sinusoidal pitching of the blades greatly improves the performance of the turbine. With an appropriate amplitude of pitching, not only the power efficiency increases, but the fluctuation in power output, rotation speed and torque output are suppressed as well. Results also show that the hydrodynamics forces on a blade of a variable pitch turbine are lower than those of the fixed-blade turbine.

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Simulating variable pitch crossflow water turbines: A coupled unsteady ONERA-EDLIN model and streamtube model

Cited by 18 publications

References 14 publications

Experimental study on blade pitch angle effect on the performance of a three-bladed vertical-axis Darrieus hydro turbine

Experimental study on blade pitch angle effect on the performance of a three-bladed vertical-axis Darrieus hydro turbine

Hydrodynamic modelling of marine renewable energy devices: A state of the art review

Numerical investigation of vertical-axis tidal turbines with sinusoidal pitching blades

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