Dynamic-stall regulation of the Darrieus turbine

Oler, J. W.; Strickland, J. H.; Im, B.J.; Graham, Gavin H.

doi:10.2172/5847876

Cited by 52 publications

(52 citation statements)

References 20 publications

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“…In Figure 10 we compare the simulated tangential and normal force coefficients with experimental data (Oler et al, 1983). The numerical results match the trend of the measured ones but the magnitudes are different.…”

Section: Grid Sensitivity Analysismentioning

confidence: 65%

“…Figure 12 compares the snapshots of vorticity contours at θ = 100 o at different TSRs. It is clear that a high TSR (Oler et al, 1983) and simulation.…”

Section: Tip Speed Ratio Effectmentioning

confidence: 99%

“…The flow conditions and geometry are based on experiment of Oler et al (1983). They tested a straight one-bladed rotor with NACA0015 profile in a water tow tank.…”

Section: Grid Sensitivity Analysismentioning

confidence: 99%

“…As a result, it requires Both experimental and numerical studies have been reported in the study of H-rotors. In their wind tunnel experiment Oler, Strickland, Im, and Graham (1983) observed a large vortex on a single-bladed H-rotor. Simão Ferreira, Kuik, Bussel, and Scarano (2009) used the PIV method to visualize vortex shedding from a single-bladed H-rotor.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Chen

Lian

2015

Engineering Applications of Computational Fluid Mechanics

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We study the vortex dynamics of a two-dimensional H-rotor wind turbine using a Navier-Stokes solver. The k-ε turbulence model with the wall function is used as the turbulence closure. A sliding mesh technique is employed to handle the blade rotation. The vortex-blade interaction is systematically investigated and its influence on the force generation is discussed. Our simulations show that the vortex-blade interaction largely depends on the solidity and tip speed ratio. We further study the impact of solidity on the turbine performance. Our simulations show that the peak torque per blade decreases with the solidity while the peak torque azimuthal angle increases with the solidity. Our simulations also show that the increase in the azimuthal angle is more significant at low tip speed ratios than at high tip speed ratios. The impact of blade thickness is studied. Our simulations show that a thicker airfoil has a higher torque coefficient than a thinner airfoil. However, because for the thinner airfoil its peak torque occurs at a high tip speed ratio, the thinner airfoil has an overall higher power coefficient than the thicker airfoil.

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Section: Grid Sensitivity Analysismentioning

confidence: 65%

“…Figure 12 compares the snapshots of vorticity contours at θ = 100 o at different TSRs. It is clear that a high TSR (Oler et al, 1983) and simulation.…”

Section: Tip Speed Ratio Effectmentioning

confidence: 99%

“…The flow conditions and geometry are based on experiment of Oler et al (1983). They tested a straight one-bladed rotor with NACA0015 profile in a water tow tank.…”

Section: Grid Sensitivity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Chen

Lian

2015

Engineering Applications of Computational Fluid Mechanics

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“…In the 1980s, Sandia National Laboratories conducted a series of experiments on large VAWTs with parabolic blades made of extruded aluminum [7][8][9]. The measured data on the Sandia 17-m turbine [8] are still widely used to validate simulation models, because of the turbine's size and the Reynolds number Re > 1 × 10 6 [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Measurements of the Aerodynamic Normal Forces on a 12-kW Straight-Bladed Vertical Axis Wind Turbine

et al. 2015

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The knowledge of unsteady forces is necessary when designing vertical axis wind turbines (VAWTs). Measurement data for turbines operating at an open site are still very limited. The data obtained from wind tunnels or towing tanks can be used, but have limited applicability when designing large-scale VAWTs. This study presents experimental data on the normal forces of a 12-kW straight-bladed VAWT operated at an open site north of Uppsala, Sweden. The normal forces are measured with four single-axis load cells. The data are obtained for a wide range of tip speed ratios: from 1.7 to 4.6. The behavior of the normal forces is analyzed. The presented data can be used in validations of aerodynamic models and the mechanical design for VAWTs.

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Aerodynamics and Blade Design

Schaffarczyk¹

2014

Understanding Wind Power Technology

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Dynamic-stall regulation of the Darrieus turbine

Cited by 52 publications

References 20 publications

Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Measurements of the Aerodynamic Normal Forces on a 12-kW Straight-Bladed Vertical Axis Wind Turbine

Aerodynamics and Blade Design

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