Darrieus turbines: The physics of self-starting

Hill, Nick J.; Dominy, Robert; Ingram, Grant; Dominy, J.

doi:10.1243/09576509jpe615

Cited by 103 publications

(82 citation statements)

References 6 publications

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“…A typical case which was experimentally studied by Hill et al 7 and also numerically studied by Untaroiu et al 13 is employed to test the reliability of the present numerical method for simulating the passive rotation of three-bladed straight-type VAWT. The simulation parameters are as follows: c = 0.083 m, s = 0.664, b = 0°, J = 0.03 kg m 2 , and U N = 6.0 m/s.…”

Section: Methods Validationmentioning

confidence: 99%

Self-starting aerodynamics analysis of vertical axis wind turbine

Zhu

Huang

Shen

2015

Advances in Mechanical Engineering

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Vertical axis wind turbine is a special type of wind-force electric generator which is capable of working in the complicated wind environment. The self-starting aerodynamics is one of the most important considerations for this kind of turbine. This article aims at providing a systematic synthesis on the self-starting aerodynamic characteristics of vertical axis wind turbine based on the numerical analysis approach. First, the physical model of vertical axis wind turbine and its parameter definitions are presented. Secondary, the interaction model between the vertical axis wind turbine and fluid is developed by using the weak coupling approach; the numerical data of this model are then compared with the wind tunnel experimental data to show its feasibility. Third, the effects of solidity and fixed pitch angle on the self-starting aerodynamic characteristics of the vertical axis wind turbine are analyzed systematically. Finally, the quantification effects of the solidity and fixed pitch angle on the self-starting performance of the turbine can be obtained. The analysis in this study will provide straightforward physical insight into the self-starting aerodynamic characteristics of vertical axis wind turbine.

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Section: Methods Validationmentioning

confidence: 99%

Self-starting aerodynamics analysis of vertical axis wind turbine

Zhu

Huang

Shen

2015

Advances in Mechanical Engineering

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“…Untaroiu et al [9] studied the self-starting behavior of a Durham type wind turbine with three blades [10], employing the ANSYS-CFX solver and k-ε turbulence model. As a result, two-dimensional (1.36 × 10 5 cells) and three-dimensional (7.9 × 10 6 cells) grids provide similar final angular velocity.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

2018

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This study deals with the three-dimensional unsteady numerical simulation of the flow around a cross-flow vertical-axis water turbine (CFWT) of the Darrieus type. The influence of turbine design on its hydrodynamic characteristics and performance is investigated by means of a time-accurate Reynolds Averaged Navier Stokes (RANS) commercial solver. The flow unsteadiness is described using a transient rotor-stator model in connection with a sliding interface. A classical Darrieus straight blade turbine, based on the NACA0025 airfoil, has been modified adding winglets (symmetric and asymmetric designs) to the blades' tips with the objective of reducing the strength of the detached trailing vortices. The turbulent features of the flow have been modelled by using different turbulence models (k-ε Renormalization Group, standard Shear Stress Transport, transition Shear Stress Transport and Reynolds Stress Model). As a result, the predicted hydrodynamic performance of the turbine including winglets increases, independently of the employed turbulence model, being the improvement higher when a symmetric winglet design is considered. Moreover, visualization of skin friction lines pattern and their connection with vorticity isosurfaces, illustrating the flow detachment in the three blade configurations, has been carried out. Finally, a short discussion about the intermittency behavior along a turbine revolution is presented.

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“…Although Darrieus wind turbine was previously known for its difficulty in self-start [13][14][15], recent studies have shown that there are certain conditions that can make it otherwise. According to the recent literature on self-starting ability of the H-Darrieus wind turbine, Dominy et al [16] and Hill et al [17] demonstrated that it is possible to have a self-start three-bladed H-rotor VAWT using Figure 1. Wind profile in the internal boundary layer in a built environment [6].…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a Novel Building Integrated Cross Axis Wind Turbine

et al. 2017

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Abstract:The prospect of harnessing wind energy in urban areas is not promising owing to low wind speeds and the turbulence caused by surrounding obstacles. However, these challenges can be overcome through an improved design of wind turbine that can operate efficiently in an urban environment. This paper presents a novel design of a building integrated cross axis wind turbine (CAWT) that can operate under dual wind direction, i.e., horizontal wind and vertical wind from the bottom of the turbine. The CAWT consists of six horizontal blades and three vertical blades for enhancing its self-starting behavior and overall performance. The study employed a mock-up building model with gable rooftop where both of the developed CAWT and the conventional straight-bladed vertical axis wind turbine (VAWT) are mounted and tested on the rooftop. The height of the CAWT and the VAWT above the rooftop was varied from 100 to 250 mm under the same experimental conditions. The results obtained from the experimental study showed that there is significant improvement in the coefficient of power (C p ) and self-starting behavior of the building integrated CAWT compared to the straight-bladed VAWT. At 100 mm height, the C p,max value of the CAWT increased by 266%, i.e., from 0.0345 to 0.1263, at tip speed ratio (TSR) (λ) of 1.1 and at wind speed of 4.5 m/s. Similar improvements in performance are also observed for all condition of CAWT heights above the rooftop where the CAWT outperformed the straight-bladed VAWT by 196%, 136% and 71% at TSR of 1.16, 1.08, and 1.12 for Y = 150, 200, and 250 mm, respectively. Moreover, the CAWT performs better at 10 • pitch angle of the horizontal blade compared to other pitch angles.

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Darrieus turbines: The physics of self-starting

Cited by 103 publications

References 6 publications

Self-starting aerodynamics analysis of vertical axis wind turbine

Self-starting aerodynamics analysis of vertical axis wind turbine

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

Design and Testing of a Novel Building Integrated Cross Axis Wind Turbine

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